1-alkyl-, 1-alkenyl- and 1-alkynylaryl-2-amino-1, 3-propanediols and related compounds, a process and intermediates for their preparation and their use as medicaments

Abstract: The present invention relates to novel 1-alkyl-, 1-alkenyl- and 1-alkynylaryl-2-amino-1,3-propanediols, intermediates and processes for the preparation thereof. The compounds of the invention exhibit antiinflammatory, memory dysfunction relieving, cell proliferation reducing, antibacterial and antifungal activity and can, therefore, be used as medicaments.

Description: The present invention relates to 1-alkyl-, 1-alkenyl-, and 1-alkylnylaryl-2-amino-1,3-propanediols of formula 1 RCH(OR¹)CH(NR²R³)R⁴ 1 wherein R is wherein R⁵ is CH₃(CH₂) m C Ξ C, CH₃(CH₂) m CH=CH,CH₃(CH₂) m CH₂CH₂, wherein m is 3 to 15, n is 0 to 12, and W and X are independently hydrogen, alkyl, alkoxy, halogen, or trifluoromethyl, Z is S, O, or C=O; and A is S or O; R¹ is hydrogen or wherein R⁶ is hydrogen, alkyl, alkoxy, or R² is hydrogen or alkyl; R³ is hydrogen, alkyl or wherein R⁶ is as above; R⁴ is wherein R⁷ is hydrogen or alkyl, or CH₂OR⁸ wherein R⁸ is hydrogen or wherein R⁶ is as above; R¹ and R⁸ taken together with the oxygen to which they are attached form a group of the formula wherein R⁹ and R¹⁰ are independently hydrogen or alkyl; the optical isomers thereof, or the pharmaceutically acceptable salts thereof, which are useful for reducing inflammation by virtue of their ability to inhibit protein kinase C and thus indicated for the treatment of psoriasis and other skin disorders, for inhibiting tumor or neoplastic cell growth by virtue of their ability to reduce cell proliferation and thus indicated in cancer therapy, and relieving memory dysfunction and thus indicated in the treatment of Alzheimer's disease, and as antibacterial and antifungal agents, alone or in combination with adjuvants. Preferred 2-amino-1,3-propanediols of the present invention are those wherein R is R¹, R², and R³ are hydrogen and R⁵ is CH₃(CH₂) m CH₂CH₂ or Also preferred are compounds wherein R is R¹ and R² are hydrogen; R⁴ is and R⁵ is CH₃(CH₂) m CΞC. The present invention also relates to compounds of the formula R'CHO 1a wherein R' is wherein R⁵ is CH₃(CH₂) m C Ξ C, CH₃(CH₂) m CH=CH,CH₃(CH₂) m CH₂CH₂, or wherein m is 3 to 15, n is 0 to 12, W and X are independently hydrogen, alkyl, alkoxy, halogen, or trifluoromethyl and Z is O, which are useful as intermediates for the preparation of the present 2-amino-1,3-propanediols. As used through the specification and appended claims, the term "alkyl" refers to a straight or branched chain hydrocarbon radical containing no unsaturation and Examples of alkyl groups are methyl, ethyl, 1-propyl, 2-propyl, 1-butyl, 1-pentyl, 3-hexyl, 4-heptyl and 2-octyl. The term "alkanol" refers to a compound formed by a combination of an alkyl group and hydroxy radical. Examples of alkanols are methanol, ethanol, 1- and 2-propanol, 2,2-dimethylethanol, hexanol and octanol. The term "alkanoic acid" refers to a compound formed by combination of a carboxyl group with a hydrogen atom or alkyl group. Examples of alkanoic acids are formic acid, acetic acid, propanoic acid, 2,2-dimethylacetic acid, hexanoic acid and octanoic acid. The term "halogen" refers to a member of the family fluorine, chlorine, bromine, or iodine. The term "alkanoyl" refers to the radical formed by removal of the hydroxyl function from an alkanoic acid. Examples of alkanoyl groups are formyl, acetyl, propionyl, 2,2-dimethylacetyl, hexanoyl and octanoyl. Any of the aforementioned groups having a carbon skeleton are "lower" ones containing up to and including 8 carbon atoms. The compounds of the present invention which lack an element of symmetry exist as optical antipodes and as the racemic forms thereof. The optical antipodes may be prepared from the corresponding racemic forms by standard optical resolution techniques, involving, for example, the separation of diastereomeric salts of those instant compounds characterized by the presence of a basic amino group and an optically active acid, those instant compounds characterized by the presence of a carboxylic acid group and an optically active base, or by synthesis from optically active precursors. The present invention comprehends all optical isomers and racemic forms thereof and all geometric isomers of the compounds disclosed and claimed herein. The formulas of the compounds shown herein are intended to encompass all possible geometric and optical isomers of the compounds so depicted. The compounds of the present invention that have adjacent chiral centers exist as diastereomers and are distinguished as the erythro- and threo-isomers. The erythro diastereomers are those that become meso, i.e., optically inactive, by virtue of having an element of symmetry in one of the possible conformations, when one of the dissimilar substituents is replaced by the other. The threo diastereomers are those that remain enantromeric, i.e., optically active, by virtue of lacking an element of symmetry in one of the possible conformations, when one of the dissimilar substitutents is replaced by the other. For example, replacement of the amino group of an erythro-2-amino-1,3-propanediol 9a of the present invention by a hydroxyl group creates a meso- 1,2,3-propanetriol 9b , having a plane of symmetry through the carbon backbone of the molecule, as shown below, and replacement of the amino group of a threo-2-amino-1,3-propanediol 9c of the present invention by a hydroxy group creates an enantiomer 9d , lacking an element of symmetry in all conformations, one of which is 9d . The novel 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols of the present invention are prepared by the processes illustrated in Reaction Schemes A, B, and C for the pyridine series, having an aralkyl side-chain. The transformations shown therein are applicable to the preparation of compounds of the invention wherein the aryl group is, among others, substituted and unsubstituted phenyl, furyl, thienyl, isoxazolyl, isothiazolyl, and pyrrolyl, thiazolyl, and oxazolyl, having a 1-alkyl, 1-alkenyl, or 1-alkynyl-side chain. To prepare a 1-alkynylpyridinyl-2-amino-1,3-propanediol 7 wherein W and X are hydrogen, alkyl, alkoxy, halogen, or trifluoromethyl, a pyridinylcarboxaldehyde 2 wherein W and X are as above and Y is halogen is condensed with an amidomalonic acid ester 3 wherein R¹¹ and R¹² are alkyl to provide an alkyl pyridinylpropionate 4 wherein R¹¹, R¹², X, and Y are as above, which is alkynylated to alkynylpyridine 5 wherein R¹¹, R¹², W and X are as above and n is 3 to 15 and, in turn, reduced to pyridinyl-1,3-propanediol 6 wherein R¹², W, and X are as above and hydrolyzed to 7 . The condensation of carboxaldehyde 2 and malonate 3 is conducted in an ethereal solvent in the presence of a tertiary amine. Among ethereal solvents there may be mentioned diethyl ether, 1,2-dimethyoxyethane, 2-methoxyethyl ether, dioxane, and tetrahydrofuran. Among tertiary amines there may be mentioned pyridines (pyridine, picoline, lutidine, and collidine) and trialkylamines (trimethylamine, triethylamine, and tripropylamine). Tetrahydrofuran and triethylamine are the preferred solvent and tertiary amine, respectively, While the condensation temperature is not critical, the reaction is preferably performed at about ambient temperature (25°C), although reduced temperatures (about 0°C to about 25°C) or elevated temperatures (about 25°C to the boiling point of the reaction mixture) may be employed. The alkynylation is performed by treating a halopyridine 4 with an alkyne 13 wherein W and n are as above in an acid acceptor, e.g., a di- or trialkylamine, such as, diethylamine, dipropylamine, trimethylamine, triethylamine, or tripropylamine, in the presence of bis(triphenylphosphine)palladium dichloride/cuprous iodide at a temperature of about 0° to about 75°C. Triethylamine is the preferred acceptor. A temperature of about 50° to 60°C is the preferred alkynylation temperature. An ethereal solvent may be employed. Ethereal solvents include diethyl ether, 1,2-dimethoxyethane, 2-methoxyethyl-ether, dioxane, and tetrahydrofuran. Tetrahydrofuran is the preferred solvent. The reduction of an alkyl pyridinylpropionate 5 to a propanediol 6 is accomplished by means of an alkali borohydride in an ethereal solvent at a reduction temperature within the range of about 0° to about 50°C. Included among alkali borohydrides are calcium borohydride, lithium borohydride, potassium borohydride, and sodium borohydride. Included among ethereal solvents are diethyl ether, 1,2-dimethoxyethane, 2-methoxyethyl ether, dioxane, and tetrahydrofuran. A reducing system of lithium borohydride or calcium borohydride in tetrahydrofuran at a temperature of from about 0° to 25°C is preferred. The hydrolysis of a carboxamide 6 to an aminodiol 7 may be carried out by conventional hydrolysis techniques. For example, carboxamide 6 may be hydrolyzed by an alkali metal hydroxide, i.e., lithium hydroxide, sodium hydroxide, or potassium hydroxide, in an aqueous alkanol, i.e., methanol, ethanol, or 1- or 2-propanol, at a hydrolysis temperature of about 0°C to about 100°C. To prepare a 1-alkylpyridinyl-2-amino-1,3-propanediol 9 wherein W, X, and m are as hereinbeforedescribed, a 1-alkynylpyridinyl-2-amido-1,3-propanediol 6 is hydrogenated to a 1-alkylpyridinyl-2-amido-1,3-propanediol 8 , which is converted to a 1-alkylpyridinyl-2-aminol-1,3-propanediol 9 . The hydrogenation is effected by treating an alkyne 6 with hydrogen at about atmospheric pressure to about 60 psi, a pressure of about 40 psi being preferred, in the presence of a metal catalyst, e.g., platinum, palladium, rhodium, or ruthenium, unsupported or supported on carbon or calcium carbonate, palladium-on-carbon being preferred, in an alkanol, e.g., methanol, ethanol, or 1- or 2-propanol, ethanol being preferred, at a hydrogenation temperature of about 25° to about 50°C, a temperature of about 25°C being preferred. The conversion of pyridinylamidodiol 8 to pyridinylaminodiol 9 , i.e., the hydrazinolysis of 8 , is conducted with hydrazine, free or in its hydrated form, in an alkanol such as, for example, methanol, ethanol, or 1- or 2-propanol, at a temperature of from about 25°C to the reflux temperature of the reaction mixture. Ethanol is the preferred solvent. A hydrazinolysis temperature of about the reflux temperature of the reaction mixture is also preferred. Alternatively, entry into the 1-alkynyl- and 1-alkylpyridinyl-2-amino-1,3-propanediol systems, i.e., systems of formulas 7 and 9 , respectively, wherein W, X, and m are as hereinbeforedescibed may be achieved by alkynylation of pyridinylcarboxaldehyde 2 wherein W, X, and Y are as above to alkynylpyridinylcarboxaldehyde 10 wherein W, X, and m are as above followed by conversion of pyridinylcarboxaldehyde 10 to alkyl pyridinylpropionate 5 wherein R¹¹, R¹², W, X, and m are as above and hydrogenation of an alkynylpyridine 5 wherein R¹¹, R¹², W, X, and m are as above to 11 wherein R¹¹, R¹², W, X, and m are as above. The alkynylation, conversion, and hydrogenation, i.e., the transformations of 2 to 5 and 11 , via 10 , are accomplished by processes substantially similar to the corresponding transformations of 4 to 5 , 2 to 4 , and 6 to 8 . Alkyl 1-alkylpyridinylpropionate 11 wherein R¹¹, R¹², W, X, and m are as above may be reduced to 1-alkyl pyridinylpropanediol 8 by the process essentially the same as that employed for the reduction of alkyl pyridinylpropionate 5 to propanediol 6 . Entry into the 1-alkynylpyridinyl-2-amino-1,3-propanediol series, i.e., the series encompassing compounds of formulas 5 , 6 , and 7 , is also attained by reducing an alkyl pyridinylpropionate 4 wherein R¹¹, R¹², W, X and Y are as hereinbeforedescribed to a pyridinylpropanediol 12 and alkynylating a pyridinyldiol 12 , so obtained, to alkynylpyridinyldiol 6 . As described above, amidopropanediol 6 is converted to amino propanediol 7 by hydrolysis. Similarly, the reduction of 4 to 12 and the alkynylation of 12 to 6 are performed by processes substantially the same as those utilized for the conversion of 5 to 6 and 4 to 5 . Derivatives of an alkynylpyridinyl-2-amino-1,3-diol 7 are prepared from amidopropanediol 6 by acylation of 6 wherein R¹², W, X, and m are as hereinbeforedescribed to an amidodiacyloxypropane 15 wherein R¹², R¹³, R¹⁴, W, and m are as hereinbeforedescribed with, for example, an alkanoic acid anhydride such as acetic anhydride in the presence of triethylamine and 4-dimethylaminopyridine to 15 , and dioxanylation of 6 to amidodioxane 14 wherein R¹², R¹⁵, R¹⁶, W, X, and m are as hereinbeforedescribed with, for example, 2,2-dimethoxypropane in the presence of para-toluene sulfuric acid. Hydrolysis of 15 as described for the conversion of 6 to 7 provides aminopropanediol 7 . An amidodiacyloxypropane 15 is selectively hydrolyzed to an amidodihydroxy propane 20 by, for example, an alkali metal carbonate such as lithium, sodium, or potassium carbonate in an alkanol such as methanol, ethanol, or 2-propanol. Potassium carbonate in methanol is the preferred hydrolysis medium. The hydrolysis proceeds readily at ambient temperature. Elevated temperatures to the reflux temperature of the hydrolysis medium may be employed. Acyl derivatives of amidopropanediol 12 wherein R¹², X, and Y are as hereinbeforedescribed are prepared by treating 12 with an alkanoic acid anhydride under the conditions for the conversion of 6 to 15 . To prepare a 1-alkenyl-2-amino-1,3-propanediol 17 wherein W, X, and m are as hereinbeforedescribed a 1-alkynyl-2-amino-1,3-propanediol 6 wherein R¹², W, X, and m are as above is hydrogenated to a 1-alkenyl-2-amino-1,3-propanediol 16 wherein R¹², W, X, and m are as above and the configuation of the hydrogen atoms of the carbon-to-carbon double bond is cis, which is hydrolyzed to 17 wherein W, X, and m are also as above. To fabricate an N,O,O-tribenzyloxycarbonyl-2-amino-1,3-propane 18 wherein R¹⁵ is an 2-amino-1,3-propanediol 9 is treated with N-benzyloxycarbonyloxysuccinimide 20 in the presence of a tertiary amine, e.g., triethyl amine in an ethereal solvent, e.g., tetrahydrofuran at about ambient temperature. To synthesize a 2-amino-1,3-propanediol 19 , a 1,3-diacyloxy-2-propanylacetamide 13 is hydrolyzed by hydrazine hydrate in the presence of ethanol according to the procedure for the conversion of 8 or 9 . Generally, the ultimate 1-alkylaryl-2-amino-1,3-propanediols of the present invention are prepared from 1-alkynylarylcarboxaldehydes. See Reaction Scheme A for the conversion of 10 to 9 in the pyridine series. In the isoxazole series, the ultimate 1-alkylisoxazolyl-2-aminol-1,3-propanediols may be prepared, for example, from a 5-(1-alkyl)-3-isoxazolecarboxaldehyde 21 wherein R⁵ is dodecyl. A 3-isoxazolecarboxaldehyde 21 wherein R⁵ is dodecyl, in turn, is synthesized, for example, by condensing 1-nitrotridecane with O-trimethylsilylpropynol in the presence of phenylisocyanate and triethylamine followed tetrabutylammonium fluoride to afford isoxazolemethanol 22 wherein R⁵ is dodecyl, which is oxidized by oxalyl chloride:dimethylsulfoxide to 21 . To prepare a 2-alkoxycarbonylamino-1,3-propanediol, for example, 1-alkynyl-2-t-butyloxycarbonylamino-1,3-propanediol 6 wherein R¹² is OC(CH₃)₃, a 1-alkynyl-2-amino-1,3-propanediol 7 is acylated with di-t-butyldicarbonate in the presence of a base such as sodium bicarbonate in a halocarbon solvent such as chloroform at an elevated temperature of about 60°C. To prepare a 2-dialkylamino-1,3-propanediol, for example, a 1-alkenyl-2-dimethylamino-1,3-propanediol 23 , a 1-alkenyl-2-amino-1,3-propanediol 17 is reductively alkylated with formaldehyde such as formalin in the presence of a reducing agent such as sodium cyanoborohydride in a solvent such as acetonitrile at ambient temperature. A 1-alkenyl-2-amino-1,3-propanediol, e.g., a 1-alkenylpyridinyl-2-amino-1,3-propanediol 17 , is prepared by reduction of a 1-alkynylpyridinyl-2-acylamino-1,3-propanediol 6 via a 1-alkenylpyridinyl-2-acylamino-1,3-propanediol 16 . See Reaction Scheme C. Alternatively, a 1-alkenyl-2-amino-1,3-propanediol, e.g., a 1-alkenylthienyl-2-amino-1,3-propanediol 27 , is prepared by condensation of a halothiophenecarboxyaldehyde 25 wherein X is bromo with a tri-n-butyl-1-alkenylstannane 24 in the presence of 2,6-di-t-butyl-4-methylphenol and tetrakis(triphenylphosphine)palladium(O) in an aromatic solvent such as toluene at room temperature to a 1-alkenylthiophenecarboxaldehyde 26 (see Reaction Scheme D), which, in turn, is converted to a 2-amino-1,3-diol 27 and derivatives thereof by the processes outlined in Reaction Schemes A, B, and C. The requisite tri-n-butyl-1-alkenylstannane 24 is prepared by reductive condensation of an alkyne 28 with tri-n-butyltinhydride in the presence of azobisisobutyronitrile. The 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols of the present invention are useful as agents for the relief of memory dysfunction, particularly dysfunctions associated with decreased cholinergic activity such as those found in Alzheimer's disease. Relief of memory dysfunction activity of the instant compounds is demonstrated in the dark avoidance assay, an assay for the determination of the reversal of the effects of scopolamine induced memory deficits associated with decreased levels of acetylcholine in the brain. In this assay, three groups of 15 male CFW mice were used--a vehicle/vehicle control group, a scopolamine/vehicle group, and a scopolamine/drug group. Thirty minutes prior to training, the vehicle/vehicle control group received normal saline subcutaneously, and the scopolamine/vehicle and scopolamine/drug groups received scopolamine subcutaneously (3.0 mg/kg, administered as scopolamine hydrobromide). Five minutes prior to training, the vehicle/vehicle control and scopolamine/vehicle groups received distilled water and the scopolamine/drug group received the test compound in distilled water. The training/testing apparatus consisted of a plexiglass box approximately 48 cm long, 30 cm high and tapering from 26 cm wide at the top to 3 cm wide at the bottom. The interior of the box was divided equally by a vertical barrier into a light compartment (illuminated by a 25-watt reflector lamp suspended 30 cm from the floor) and a dark compartment (covered). There was a hole at the bottom of the barrier 2.5 cm wide and 6 cm tall and a trap door which could be dropped to prevent an animal from passing between the two compartments. A Coulbourn Instruments small animal shocker was attached to two metal plates which ran the entire length of the apparatus, and a photocell was placed in the dark compartment 7.5 cm from the vertical barrier and 2 cm off the floor. The behavioral session was controlled by PDP 11/34 minicomputer. At the end of the pretreatment interval, an animal was placed in the light chamber directly under the light fixture, facing away from the door to the dark chamber. The apparatus was then covered and the system activated. If the mouse passed through the barrier to the dark compartment and broke the photocell beam within 180 seconds, the trap door dropped to block escape to the light compartment and an electric shock was administered at an intensity of 0.4 milliamps for three seconds. The animal was then immediately removed from the dark compartment and placed in its home cage. If the animal failed to break the photocell beam within 180 seconds, it was discarded. The latency is seconds for each mouse was recorded. Twenty-four hours later, the animals were again tested in the same apparatus except that no injections were made and the mice did not receive a shock. The test day latency in seconds for each animal was recorded and the animals were then discarded. The high degree of variability (due to season of the year, housing conditions, and handling) found in one trial passive avoidance paradigm is well known. To control for this fact, individual cutoff (CO) values were determined for each test, compensating for interest variability. Additionally, it was found that 5 to 7% of the mice in the scopolamine/vehicle control groups were insensitive to scopolamine at 3 mg/kg, sc. Thus, the CO value was defined as the second highest latency time in the control group to more accurately reflect the 1/15 expected control responders in each test group. Experiments with a variety of standards repeated under a number of environmental conditions led to the development of the following empirical criteria: for a valid test, the CO value had to be less than 120 sec and the vehicle/vehicle control group had to have at least 5/15 animals with latencies greater than CO. For a compound to be considered active the scopolamine/compound group had to have at least 3/15 mice with latencies greater than CO. The results of the dark avoidance test are expressed as the number of animals per group (%) in which this scopolamine induced memory deficit is blocked as measured by an increase in the latency period. Relief of memory dysfunction activity for representative compounds of the present invention is presented in Table 1. Compound Dose (mg/kg, sc) Percent of Animals with Scopolamine Induced Memory Deficit Reversal ethyl erythro-2-acetamido-3-[6-(1-decynyl)-2-pyridinyl]-3-hydroxypropionate 3.0 27 erythro-N-{1-[6-(1-decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide 3.0 33 physostigmine 0.31 20 Scopolamine induced memory deficit reversal is achieved when the present 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediol, and related compounds are administered to a subject requiring such treatment as an effective oral, parenteral or intravenous dose of from 0.01 to 100 mg/kg of body weight per day. A particularly effective amount is about 25 mg/kg of body weight per day. It is to be understood, however, that for any particular subject, specific dosage regimens should be adjusted according to the individual need and the professional judgment of the person administering or supervising the administration of the aforesaid compound. It is to be further understood that the dosages set forth herein are exemplary only and that they do not, to any extent, limit the scope or practice of the invention. The 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols of the present invention are also useful as antiiflammatory agents due to their ability to reduce inflammation in mammals. The antiinflammatory activity is demonstrated in the TPA-induced ear edema assay and the arachidonic acid-induced ear edema test (see J. M. Young, et al., Journal Investigative Dermatology, 80 , 48 (1983)). In the TPA-induced ear edema assay, TPA (12-O-tetradecanoylphorbol-13-acetate) was dissolved in 30/70 propylene glycol/ethanol and was applied to the right ear of groups of 6 female Swiss Webster mice, which were housed together in a cage under standard conditions for 1 week prior to use with food and water ad lib, at a volume of 20 µl so that a total of 10 µg of TPA is delivered to the inner and outer surfaces of the ear. The test compound was dissolved in the vehicle and was applied to the right ear (the inner and outer surface) at a volume of 20 µl so that a total of 10 µg of the compound was delivered to the ear. After about 5 hours, the animals were sacrificed, a 4 mm diameter plug was taken from each ear and weighed. The difference between the right and left ear plug weights for each animal was determined. The antiinflammatory activity of the test compound is expressed as the mean percent change in the ear plug weight of the treated animals compared to the mean percent change in the plug weight of the control animals. Antiinflammatory activity of representative compounds of the instant invention as determined in this assay are presented below in Table 2. Compound Antiinflammatory Activity Percent Decrease in Ear Plug Weight at 10 µg/ear erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane 66 ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxypropionate 50 erythro-N-{1-[6-(1-dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide 59 erythro-2-amino-1-(6-dodecyl-2-pyridinyl)-1,3-propanediol 24 threo-2-amino-1-(6-decyl)-2-pyridinyl)-1,3-propanediol 30 D-erythro-sphingosine 46 In the arachidonic acid-induced ear edema assay, the test compound was dissolved in 30/70 propylene glycol/ethanol and was applied to both ears of groups of 6 female Swiss Webster mice, which were housed together in a cage under standard conditions for 1 week prior to use with food and water ad lib, at a volume of 20 µl so that a total of 1.0 mg of test compound was delivered to each ear over the inner and outer surfaces. The same volume (20 µl) of vehicle was applied to each ear of a control group of mice. After 30 minutes, arachidonic acid was applied to the right ear of each mouse of each group in the amount of 4 mg/ear. Vehicle was applied to the left ear of each mouse of each group at a volume of 20 µl/ear. After an additional hour, the mice were sacrificed and a 4 mm plug was taken from each ear and weighed. The difference between the right and left ear plugs was determined for each animal. The antiinflammatory activity of the test compound is expressed as the mean percent change in the ear plug weight of the treated animals relative to the mean percent change in weights of control animals' ear. Antiinflammatory activity of representative compounds of the present invention as determined in this assay are presented below in Table 3. Compound Antiinflammatory Activity Percent Decrease in Ear Plug Weight at 1 mg/ear erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane 32 D-erythro-sphingosine +9 Inflammation reduction is achieved when the present 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols are administered topically, including ophthalmic administration, to a subject requiring such treatment as an effective topical dose of from 0.001 to 100 mg/kg of body weight per day. A particularly effective amount is about 25 mg/kg of body weight per day. It is to be understood however, that for any particular subject, specific dosage regimens should be adjusted according to the individual need and the professional judgment of the person administering or supervising the administration of the aforesaid compound. It is to be further understood that the dosages set forth herein are exemplary only and that they do not, to any extent, limit the scope or practice of the invention. The 1-alkyl-, 1-alkenyl-, and 1-alkynyl-2-amino-1,3-propanediols of the present invention are also useful as inhibitors of tumor or neoplastic cell growth by virtue of their ability to reduce cell proliferation as demonstrated in the protein kinase C assay. (see U. Kikkawa, et al., Biochemical and Biophysical Research Communications, 135 , 636 (1986) and R. M. Bell, et al. "Methods in Enzymology, Hormone Action," Part J, P.M. Conn, Ed., Academic Press, Inc., New York, NY 1986, page 353). Protein kinase C enzyme extract was prepared from the brain of male Wistar rats weighing 180 to 200 g and purified by the method of U. Kikkawa, et al., ibid. 636. The purified extract was stored at -80°C, and aliquots were used in the protein kinase C assay performed by a modification of the method of R. M. Bell, et al., ibid. al 354. To perform the assay, duplicate aliquots of duplicate samples are employed. Basal or unstimulated protein kinase C, phosphatidylserine/diacylglycerol stimulated protein kinase C, and test samples are run in each assay. Protein kinase C extract (1-5 µg of protein; 10 µl); an 8 µl solution of N-2-hydroxyethylpiperazine-N'-2-ethylsulforic acid (500 mM), magnesium chloride (40 mM), and ethylenediaminoetetraacetic acid (10 mM); dithiothreitol (20 mM; 8 µl), Type III histone (12 µg; 8 µl), and calcium chloride (11 mM; 8 µl) was added to each unstimulated protein kinase C sample assay tube, chilled in ice. Phosphatidylserine/diacylglycerol (4 µg; 8 µl) was added to each stimulated protein kinase sample assay tube, chilled in ice. The test compound (10⁻⁴ to 10⁻¹²M in 4 µl dimethylsulfoxide) was added to the test sample tubes, chilled in ice. The volume for all sample tubes was brought to 72 µl with distilled water (18 µl for stimulated samples; 26 µl for unstimulated samples without 8 µl of phosphatidylserine/diacylglycerol). The assay tubes were allowed to warm to 25°C and an 8 µl mixture of adenosine 5'-triphosphate (100 µM) and ³²P-adenosine triphosphate (1 to 2 x 10⁵ counts per minute) was added to each tube for a final volume of 80 µl per tube. After 2 min, the reaction (the incorporation of phosphorous into Type III histone) was terminated by spotting the assay mixture on phosphocellulose paper. The spots are cut out of the paper and the radioactivity (counts per min) of each spot was determined in a scintillation counter. Percent protein kinase C inhibitory activity, i.e., the percent inhibition of the incorporation of ³²posphorous from ³²P-adenosine triphosphate into Type III histone, is calculated as follows: Protein kinase C inhibitory activity of representative compounds of the present invention expressed as the calculated concentration of test compound effecting a 50% inhibition of phosphorous uptake (IC₅₀) is presented below in Table 4. Compound Protein Kinase Inhibitory Activity IC₅₀ (µM) ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxypropionate 29 cis-erythro-N-{1-[6-(1-dodecenyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}-acetamide 66%@ 100 µM erythro-2-amino-1-(6-dodecyl-2-pyridinyl)-1,3-propanediol 8.5 erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane 48 threo-2-amino- 1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane 25 D-erythro-sphingosine 6.7 Protein kinase C inhibition is achieved when the present 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols, and related compounds are administered to a subject requiring such treatment as an effective oral, parenteral, intravenous, or topical dose of from 0.001 or 0.01 to 100 mg/kg of body weight per day. A particularly effective amount is about 25 mg/kg of body weight per day. It is to be understood, however, that for any particular subject, specific dosage regimens should be adjusted according to the individual need and the professional judgment of the person administering or supervising the administration of the aforesaid compound. It is to he further understood that the dosages set forth herein are exemplary only and that they do not, to any extent, limit the scope or practice of the invention. The 1-alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols of the present invention are also useful as antibacterial and antifungal agents due to their ability to inhibit bacterial and fungal growth in mammals. Antibacterial and antifungal activity are demonstrated in conventional antimicrobial assays assays (see D. J. Bibel, et al., The Journal of Investigative Dermatology, 92 , 632 (1989). In the aerobic antibacterial assay, the sensitivity of aerobic bacteria was tested by means of the agar dilution test in Mueller-Hinton agar. Plates were inoculated with a multipoint inoculator which delivered 5 x 10⁴ CFU/spot of stationary, freshing diluted cultures of the strains concerned. The minimun inhibitory concentration (MIC) was taken as the lowest concentration at which no visible growth could be detected after 24 hours at 37°C. In the anerobic assay, the susceptibility of obligate gram-positive and gram-negative anaerobes was tested using the agar dilution test on Wilkins-Chalgren agar. Overnight cultures of the appropriate test strains diluted 1:10 in fresh thioglycollate medium were used as the inoculum. The MICs of the antibiotics were determined after the plates had been incubated in anaerobic jars for 48 hours at 37°C. Antibacterial activity of representative compounds of the instant invention as determined in this assay is presented below in Tables 5 and 6. In the antifungal assay, utilizing a microtitration technique (U-shaped, 96 well-plate), the test compound (10 mg) is dissolved in a suitable solvent (10 ml dist. water, or 1 ml org. solvent + 9 ml dist. water). The microtiter plate is prepared as follows: The wells are each filled (2 rows/strain) with 50 µl neopeptone-dextrose broth (12-channel pipette). In addition, one row/strain is coated with 50 µl yeast-nitrogen base/well for yeasts and moulds. Subsequently, 50 µl compound solution are added to each well in the first row, mixed and diluted further by transferral of 50 µl respectively in the ratio 1:2. All wells are then inoculated with 150 µl standardized organism suspension (yeasts: 1 x 10³ organisms/ml suspension; cutaneous fungi and moulds: 1.6 x 10⁵ organisms/ml suspension); the total volume is 200 µl per well. There is also a growth control (inoculated, not medicated), a solvent control (inoculated, not medicated, containing solvent as in medicated rows) and a negative control (not inoculated, not medicated). Incubation for 5 days at 30°C is followed by photometric evaluation. The obtained measurements are checked visually (macroscopically and microscopically) and corrected where necessary. Criteria for Evaluation of the Antimycotic Effect a. Photometric measurements (matrix method) b. Growth, macroscopic evaluation c. Growth, microscopic evalucation (inversion light microscope, magn. 64x). Antifungal activity of representative compounds of the instant invention as determined in the microtiter assay is presented below in Table 7. Bacterial and fungal growth inhibition is achieved when the present 1 -alkyl-, 1-alkenyl-, and 1-alkynylaryl-2-amino-1,3-propanediols, and related compounds are administered to a subject requiring such treatment as an effective oral, parenteral, intravenous, or topical, including ophthalimic administration, dose of from 0.01 to 100 mg/kg of body weight per day. A particularly effective amount is about 25 mg/kg of body weight per day. It is to be understood, however, that for any particular subject, specific dosage regimens should be adjusted according to the individual need and the professional judgment of the person administering or supervising the administration of the aforesaid compound. It is to be further understood that the dosages set for herein are exemplary only and that they do not, to any extent, limit the scope or practice of the invention. Compounds of the present invention include: a. erythro-2-amino-1-(5-decyl-2-furyl)-1,3-dihydroxypropane; b. erythro-2-amino-1-(5-decyl-3-isothiazolyl)-1,3-dihydroxypropane; c. threo-2-amino-1-[5-decyl-3-(2-oxopyrrolyl)]-1,3-dihydroxypropane; d. erythro-2-amino-1-[6-decyl-2-(4-methylpyridinyl)]-1,3-dihydroxypropane; e. threo-2-amino-1-[6-decyl-2-(4-methoxypyridinyl)]-1,3-dihydroxypropane; f. erythro-2-amino-1-[6-decyl-2-(5-chloropyridinyl)]-1,3-dihydroxypropane; g. threo-2-amino-1-[6-decyl-2-(4-trifluoromethyl-pyridinyl)]-1,3-dihydroxypropane; h. erythro-2-amino-1-[6-(5-phenylpentyl-2-pyridinyl)-1,3-dihydroxypropane; i. erythro-2-amino-1-(2-decyl-4-thiazolyl)-1,3-dihydroxypropane; j. erythro-2-amino-1-(2-decyl-4-oxazolyl)-1,3-dihydroxypropane; k. erythro-2-methylamino-1-(5-decyl-2-thienyl)-1,3-dihydroxypropane l. erythro-2-dimethylamino-1-(3-decyl)phenyl-1,3-dihydroxypropane; m. erythro-2-(1,1-dimethylethoxy)carbonylamino-1-(2-dodecynyl-6-pyridinyl)-1,3-dihydroxypropane; n. erythro-2-amino-1-(3-(1-decenyl)phenyl)-1,3-dihydroxypropane; o. ethyl erythro-2-methoxycarbonylamino-3-(2-dodecynyl-6-pyridinyl)-3-hydroxypropionate; p. erythro-2-amino-1-(3-(1-decynyl)phenyl)-1,3-dihydroxypropane; q. erythro-2-amino-1-(3-(1-undecynyl)phenyl)-1,3-dihydroxypropane; r. erythro-2-amino-1-(4-(1-nonyl)-2-thienyl)-1,3-dihydroxypropane; s. erythro-2-amino-1-(4-(1-dodecynyl)-2-thienyl)-1,3-dihydroxypropane; t. erythro-2-amino-1-(4-(1-decyl)-2-thienyl)-1,3-dihydroxypropane; u. erythro-2-amino-1-(5-nonyl-2-thienyl)-1,3-dihydroxypropane; v. erythro-2-amino-1-(3-dodecyl-5-isoxazolyl)-1,3-dihydroxypropane; w. erythro-2-amino-1-(3-decyl-5-isoxazolyl)-1,3-dihydroxypropane; x. erythro-2-amino-1-(6-(1-dodecenyl)-2-pyridinyl)-1,3-dihydroxypropane; y. erythro-2-amino-1-(3-(6-phenyl-1-hexynyl)phenyl)-1,3-dihydroxypropane; and z. erythro-2-amino-1-(5-(6-phenylhexyl)-2-thienyl)-1,3-dihydroxypropane. Effective amounts of the compounds of the present invention may be administered topically to a subject in the form of sterile solutions, suspensions, ointments, creams, aerosols, or salves. The 1-alkyl-, 1-alkenyl, and 1-alkynylaryl-2-amino-1,3-propanediols of the present invention, while effective themselves, may be formulated and administered in the form of their pharmaceutically acceptable acid or base addition salts for purposes of stability, convenience or crystallization, increased solubility and the like. Preferred pharmaceutically acceptable acid addition salts include salts of mineral acids, for example, hydrochloric acid, sulfuric acid, nitric acid and the like, salts of monobasic carboxylic acids such as, for example, acetic acid, propionic acid and the like, salts of dibasic carboxylic acids such as, for example, maleic acid, fumaric acid and the like, and salts of tribasic carboxylic acids such as, for example, carboxysuccinic acid, citric acid and the like. Preferred pharmaceutically acceptable base addition salts include salts of alkali metals, e.g. sodium or potassium, alkaline earth metals, e.g. calcium or magnesium; or complex salts such as ammonium or substituted ammonium salts such as a mono-, di- or trialkylammonium salts or a mono, di- or trihydroxyalkylammonium salts. For the purpose of topical administration, the active compounds of the invention may be incorporated into a solution, suspension, ointment, cream, gel, aerosol, or salve. These preparations should contain at least 0.1% of active compound but may be varied to be between 0.05 and about 20% of the weight thereof. The amount of active compound in such compositions is such that a suitable dosage will be obtained. Preferred topically administered preparations should contain between 0.1 and 10% of active compound. The topical compositions may also include the following components: water, fixed oils, polyethylene, glycols, glycerol, petroleum, stearic acid, beeswax, other synthetic solvents or mixtures thereof; antibacterial agents such as benzyl alcohol or methyl paraben; antioxidants such as α-tocopherol acetate; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates; emulsifying agents such as polyoxyethylene monooleate and coloring materials and adjuvants such as ferric oxide or talc. The topical preparation can be enclosed in tubes, bottles, or jars made of metal, glass or plastic. The active compounds of the present invention may also be administered orally, for example, with an inert diluent or with an edible carrier. They may be enclosed in gelatin capsules or compressed into tablets. For the purpose of oral therapeutic administration, the aforesaid compounds may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers, chewing gums and the like. These preparations should contain at least 0.5% of active compound, but may be varied depending upon the particular form and may conveniently be between 4% to about 75% of the weight of the unit. The amount of present compound in such composition is such that a suitable dosage will be obtained. Preferred compositions and preparations according to the present invention are prepared so that an oral dosage unit form contains between 1.0-300 mgs of active compound. The tablets, pills, capsules, troches and the like may also contain the following ingredients: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, corn starch and the like; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; and a sweetening agent such as sucrose or saccharin or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring may be added. When the dosage unit is a capsule, it may contain, in addition to materials of the above type, a liquid carrier such as a fatty oil. Other dosage unit forms may contain other various materials which modify the physical form of the dosage unit, for example, as coatings. Thus tablets or pills may be coated with sugar, shellac, or other enteric coating agents. A syrup may contain, in addition to the active compounds, sucrose as a sweetening agent and certain preservatives, dyes and colorings and flavors. Materials used in preparing these various compositions should be pharmaceutically pure and non-toxic in the amounts used. For the purposes of parenteral therapeutic administration, the active compounds of the invention may be incorporated into a solution or suspension. These preparations should contain at least 0.1% of the aforesaid compound, but may be varied between 0.5 and about 50% of the weight thereof. The amount of active compound in such compositions is such that a suitable dosage will be obtained. Preferred compositions and preparations according to the present invention are prepared so that a parenteral dosage unit contains between 0.5 to 100 mgs of the active compound. The oral solutions or suspensions may also include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic. The following Examples are for illustrative purposes only and are not to be construed as limiting the invention. EXAMPLE 1 6-(1-Dodecynyl)-2-pyridinecarboxaldehyde To a solution of 6-bromo-2-pyridinecarboxaldehyde (3.0 g) in tetrahydrofuran (10 ml), was added sequentially bis(triphenylphosphine)palladium(II) chloride (0.178 g), copper(I)iodide (0.024 g), 1-dodecyne (3.25 ml), and triethylamine (2.12 ml). The solution was stirred at 40°C overnight. The reaction mixture was cooled to room temperature, charged again with bis(triphenylphosphine)palladium (II) chloride (0.024 g), copper (I) iodide (0.024 g), and triethylamine (2.12 ml), and 1-dodecyne (3.25 ml), and tetrahydrofuran (5.0 ml), and heated at 40°C for 5 hrs. The reaction mixture was again cooled and recharged as above, and heated at 40°C for 24 hrs. The cooled mixture was concentrated, taken up in ethyl acetate (100 ml), washed with water and saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was taken up in ethyl acetate (100 ml) and filtered. The filtrate was combined with material from a similar reaction run 1.43 g of the carboxaldehyde and proportionate amounts of the catalysts, 1-dodecyne, and solvent. The filtrate was concentrated. The residue was purified by flash chromatography using 1.5% ethyl acetate/hexane followed by 1% ethyl acetate/hexane as eluents. The appropriate fractions were collected and concentrated to yield 2.24 g (29%) of product, as an oil. Analysis: Calculated for C₁₈H₂₅NO: 79.66%C 9.28%H 5.16%N Found: 79.54%C 9.29%H 4.98%N EXAMPLE 2 erythro-N-{1-[6-(1-Decynyl)-2-pyridinyl]1,3-dihydroxy-2-propanyl}acetamide Ethyl erythro-2-acetamido-3-[6-(1-decynyl)-2-pyridinyl]-3-hydroxypropionate (5.71 g) in dry tetrahydrofuran (75 ml) was slowly added to 2.0 M lithium borohydride/tetrahydrofuran (7.6 ml) at 0° under nitrogen, and the mixture was stirred at room temperature overnight. The reaction mixture was chilled, and 1:1 methanol:water (50 ml) was added slowly followed by glacial acetic acid (0.5ml) until pH 6.5 was obtained. The reaction mixture was concentrated, and the residue azeotroped with methanol (4 x 40 ml). The residue was slurried with 7.5% sodium bicarbonate solution (15 ml) (pH 8.5), extracted into 3:1-trichloromethane:isopropanol and concentrated. The appropriate fractions were collected and concentrated. The residue was purified by flash chromatography on silica gel eluting with 49:1-ethyl acetate:methanol. The appropriate fractions were collected and concentrated to give 4.74 g (93%) of product, mp 85-87°C. Analysis: Calculated for C₂₀H₃₀N₂O₃: 69.33%C 8.73%H 8.09%N Found: 69.44%C 8.84%H 8.07%N EXAMPLE 3 erythro-N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-diacetyloxy-2-propanyl}acetamide N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (4.35 g), acetic anhydride (7.45 ml), triethylamine (16 ml), and 4-dimethylaminopyridine (0.24 g) in dry tetrahydrofuran (80 ml) was stirred at room temperature for 3 days. The reaction mixture was evaporated, and the residue was warmed with methanol for 20 mins, reevaporated, and the residue was azeotroped with toluene. The residue was taken up in trichloromethane, and 7.5% sodium bicarbonate solution was added until pH 8.5 was obtained. The mixture was extracted with trichloromethane, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was combined with the residue (1.0 g) from a reaction, starting with 0.829 g of acetamide, and purified by flash chromatography on silica gel eluting with 1:1-hexane:ethyl acetate. The appropriate fractions were collected and concentrated to yield 1.61 g (25%) of product. Analysis: Calculated for C₂₄H₃₄N₂O₅: 66.95%C 7.96%H 6.51%N Found: 66.65%C 8.04%H 6.36%N EXAMPLE 4 threo-N{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-diacetyloxy-2-propanyl}acetamide N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (4.35 g), acetic anhydride (7.45 ml), triethylamine (16 ml), and 4-dimethylaminopyridine (0.24 g) in dry tetrahydrofuran (80 ml) was stirred at room temperature for 3 days. The reaction mixture was evaporated, and the residue was warmed with methanol for 20 min, reevaporated and azeotroped with toluene. The residue was taken up in trichloromethane, and 7.5% sodium bicarbonate solution was added until pH 8.5 was obtained. The mixture was extracted with trichloromethane, dried over anhydrous magnesium sulfate, filtered, and concentrated. The residue was combined with 1.0 g of the residue from another reaction (0.829 g of acetamide), and purified by flash chromatography on silica gel, eluting with 1:1-hexane:ethyl acetate to yield 1.02 g (15.9%) of product, mp 59-61°C. Analysis: Calculated for C₂₄H₃₄N₂O₅: 66.95%C 7.96%H 6.51%N Found: 67.21%C 7.83%H 5.92%N EXAMPLE 5 Ethyl erythro-2-acetamido-3-[6-(1-decynyl)-2-pyridinyl]-3-hydroxypropionate A 2:1-erythro:threo mixture of ethyl 2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (10.0 g), 1-decyne (5.01 g), bis(triphenylphosphine)palladium chloride (0.42 g) and cuprous iodide (0.06 g) in triethylamine (50 ml) was heated at 50-60°C for 2.5 hrs. under nitrogen, and then at room temperature overnight. The reaction mixture was evaporated, water was added, and the mixture was extracted with ethyl acetate. The organic extract was purified by flash chromatography on silica gel, eluting with 1:1 hexane:ethyl acetate and collecting the appropriate fractions. The appropriate fractions were evaporated. Recrystallization of the residue from ethyl acetate gave 7.8 g (66%) of the product, mp 97-99°C. Analysis: Calculated for C₂₂H₃₂N₂O₄: 68.01%C 8.30%H 7.21%N Found: 68.23%C 8.28%H 7.22%N EXAMPLE 6 Ethyl threo-2-acetamido-3-[6-(1-decynyl-2-pyridinyl]-3-hydroxypropionate A mixture of ethyl 2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (17.3 g, 97% erythro), 1-decyne (8.67 g), bis(triphenylphosphine)palladium chloride (0.73 g), cuprous iodide (0.10 g), and triethylamine (13.2 g) in tetrahydrofuran (90 ml) was heated overnight at 50-55°C, under nitrogen. The reaction mixture was evaporated, water was added, and the mixture was extracted with ethyl acetate, and concentrated. The residue was purified by flash chromatography on silica gel, eluting with 1:1-hexane:ethyl acetate. The appropriate fractions were collected and evaporated. Recrystallization of the residue from 1:2-hexane:ethyl acetate gave 14.7 g of 19:1-mixture erythro:threo-compounds, and from the mother liquors, 4.66 g of an 8:3 of mixture erythro:threo compounds. Flash chromatography of 2.63 g of the threo-enriched material on silica gel, eluting with 1:1-hexane:ethyl acetate, yielded 0.39 g (3.4%) of product, mp 97-99.5°C. Analysis: Calculated for C₂₂H₃₂N₂O₄: 68.01%C 8.30%H 7.21%N Found: 67.89%C 8.26%H 7.10%N EXAMPLE 7 erythro-N-{4-[6-(1-Decynyl)-2-pyridinyl]-2,2-dimethyl-1,3-dioxan-5-yl}acetamide N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (6.1 g, 3:1/erythro:threo mixture), p-toluenesulfonic acid (3.7 g), and 2,2-dimethoxypropane (43 ml) in dichloromethane (115 ml) were stirred at room temperature overnight, under nitrogen. The reaction mixture was extracted with 0.5 M sodium bicarbonate solution and water, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 2:1-hexane:ethyl acetate to give 2.4 g (35%) of product, as an oil. Analysis: Calculated for C₂₃H₃₄N₂O₃: 71.47%C 8.87%H 7.25%N Found: 71.14%C 9.12%H 7.13%N EXAMPLE 8 threo-N-{4-[6-(1-Decynyl)-2-pyridinyl]-2,2-dimethyl-1,3-dioxan-5-yl}acetamide N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (6.1 g, 3:1-erythro:threo mixture), p-toluenesulfonic acid (3.7 g), and 2,2-dimethoxypropane (43 ml) in dichloromethane (115 ml) were stirred at room temperature overnight, under nitrogen. The reaction mixture was washed with 0.5 M sodium bicarbonate solution and water, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed twice on silica gel, eluting with 2:1-hexane:ethyl acetate to 1:1-hexane:ethyl acetate to give 0.76 g (11%) of product, as an oil. Analysis: Calculated for C₂₃H₃₄N₂O₃: 71.47%C 8.87%H 7.25%N Found: 71.15%C 8.91%H 7.06%N EXAMPLE 9 Ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxypropionate A solution of 6-(1-dodecynyl)-2-pyridinecarboxaldehyde (5.51 g), acetamidomalonic acid monoethyl ester (3.78 g), and triethylamine (2.8 ml) in dry tetrahydrofuran (30 ml) was stirred at room temperature overnight, under nitrogen. The reaction mixture was evaporated, and the residue was purified on a silica gel column eluting with 1:1-hexane:ethyl acetate to give 7.46 g (89.6%) of product (10:1-erythro:threo mixture). This product was combined with 7.40 g from a prior reaction run on the same scale, and the combined material was recrystallized from 2:1-ethyl acetate:hexane to give 9.62 g (57.7%) of the analytically pure product, mp 86-87.5°C. Analysis: Calculated for C₂₄H₃₆N₂O₄: 69.20%C 8.71%H 6.72%N Found: 69.40%C 8.72%H 6.68%N EXAMPLE 10 Ethyl erythro-2-acetamido-3-[6-(1-hexynyl)-2-pyridinyl]-3-hydroxypropionate An 11:1-erythro:threo mixture of ethyl 2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (24.9 g), 1-hexyne (7.39 g), triethylamine (19.0 g), bis(triphenylphosphine)palladium chloride (1.05 g) and cuprous iodide (0.14 g) in dry tetrahydrofuran (100 ml) was heated at 55°C for 6 hrs, under nitrogen. Additional 1-hexyne (6.2 g), triethylamine (7.6 g), bis(triphenylphosphine)palladium chloride (0.53 g), and cuprous iodide (0.07 g) were added at room temperature and the reaction mixture was heated an additional 5.5 hrs. The mixture was evaporated, water was added, and the mixture was extracted with ethyl acetate. The extract was flash chromatographed (silica gel, 1:1-hexane:ethyl acetate). The appropriate fractions were collected and evaporated. Recrystallization of the residue from 1:1-hexane:ethyl acetate provided 3.8 g (15%) of product, 87-88°C. Analysis: Calculated for C₁₈H₂₄N₂O₄: 65.04%C 7.28%H 8.43%N Found: 65.19%C 7.31%H 8.37%N EXAMPLE 11 erythro-N-{1,3-Diacetyloxy-1-[6-(1-hexynyl)-2-pyridinyl]-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-[6-(1-hexynyl)-2-pyridinyl}-3-hydroxypropionate (16.0 g) in dry tetrahydrofuran (140 ml) was added 2.0 M lithium borohydride:tetrahydrofuran (24 ml) at 0°C, with stirring, under nitrogen. After the addition was complete, the mixture was allowed to warm to room temperture and was stirred overnight. The reaction mixture was chilled and 1:1-methanol water (80 ml) was added slowly followed by acetic acid (2.8 ml) until a pH of 6.8 was obtained. The reaction mixture was stirred for 1 hr and evaporated. The residue was azeotroped several times with methanol. A 7.5% sodium bicarbonate solution was added to the residue until a pH of 8.5 was obtained, and the mixture was extracted with 3:1 trichloromethane:isopropanol and concentrated. The residue was flash chromatographed on silica gel eluting with 1% methanol:ethyl acetate to give 13.2 g (94%) of erythro-N-{1-[6-(1-hexynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide. erythro-N-{1-[6-(1-hexynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide(10.3 g), acetic anhydride (21.8 g), triethylamine (32.4 g), and 4-dimethylaminopyridine (0.44 g) in tetrahydrofuran (150 ml) was stirred at room temperature overnight. The reaction mixture was evaporated, methanol was added to the residue, and the solution was warmed at 50°C for 15 min. The mixture was evaporated. The residue was dissolved in chloroform, and 7.5% sodium bicarbonate solution was added until a pH 8 was obtained. The mixture was extracted with chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was flash chromatographed, eluting with 1:1-hexane:ethyl acetate to yield 7.3 (55%) of product, mp 97-99°C. Analysis: Calculated for C₂₀H₂₆N₂O₅: 64.16%C 7.00%H 7.48%N Found: 64.17%C 7.00%H 7.44%N EXAMPLE 12 erythro-N-{1-[6-(1-Hexynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide erythro-N-{1,3-Diacetyloxy-1-[6-(1-hexynyl)-2-pyridinyl]-2-propanyl}acetamide (6.7 g) and potassium carbonate (3.3 g) in methanol (100 ml) was stirred for 40 min. The precipitate was collected, and the filtrate was evaporated. A 7.5% sodium bicarbonate solution was added to pH 8.5, and the mixture was extracted with 3:1-trichloromethane:2-propanol, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. Recrystallization of the residue from 1:1-hexane:ethyl acetate gave 4.6 g (88%) of product, mp 75-77°C. Analysis: Calculated for C₁₆H₂₂N₂O₃: 66.19%C 7.64%H 9.65%N Found: 65.99%C 7.55%H 9.65%N EXAMPLE 13 Ethyl erythro-2-acetamido-3-hydroxy-3-[6-(1-octynyl)-2-pyridinyl]propionate A mixture of an 11:1-erythro:threo mixture of ethyl 2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (24.9 g), 1-octyne (9.9 g), triethylamine (19.0 g), bis(triphenylphosphine)palladium chloride (1.05 g) and cuprous iodide (0.14 g) in dry tetrahydrofuran (100 ml) was heated at 55°C for 6 hrs, under nitrogen. Additional 1-octyne (4.1 g), triethylamine (3.8 g), bis(triphenylphosphine)palladium chloride (0.53 g), and cuprous iodide (0.07 g) were added at room temperature, and the reaction mixture was heated an additional 4 hrs. The mixture was evaporated, water was added, and the mixture was extracted with ethyl acetate. The solution was flash chromatographed on silica gel eluting with 1:1-hexane:ethyl acetate. The fractions, enriched in the erythro isomer, were evaporated and the residue was recrystallized from 1:1-isopropanol:water to give 3.2 g (12%) of product, mp 81-83°C. Analysis: Calculated for C₂₀H₂₈N₂O₄: 66.64%C 7.83%H 7.77%N Found: 66.62%C 7.77%H 7.75%N EXAMPLE 14 erythro-N-{1,3-Dihydroxy-1-[6-(1-octynyl)-2-pyridinyl]-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-hydroxy-3-[6-(1-octynyl)-2-pyridinyl]-propionate (9.02 g) in dry tetrahydrofuran (80 ml) was added slowly 2.0 M lithium borohydride:tetrahydrofuran (12.5 ml) at 0°, under nitrogen. The mixture was stirred at room temperature overnight, chilled, and 1:1-methanol:water was added slowly followed by glacial acetic acid (1.5 ml) in 1:1-methanol:water (15 ml) until pH 6.8 was obtained. The solution was stirred at room temperature for 1.5 hrs, evaporated, and the residue was azeotroped with methanol (4 x 40 ml). The residue was slurried with 7.5% sodium bicarbonate solution (25 ml) (pH 8.5), saturated sodium chloride solution (25 ml), extracted with 3:1-trichloromethane:2-propanol, and concentrated. The residue was flash chromatographed on silica gel, eluting with ethyl acetate:0.5% methanol. The appropriate fractions were collected and evaporated. The residue was recrystallized (3 times) from ethyl acetate to give 1.24 g (15.6%) of product, mp 81-83°C. Analysis: Calculated for C₁₈H₂₆N₂O₃: 67.90%C 8.23%H 8.80%N Found: 68.03%C 7.97%H 8.70%N EXAMPLE 15 Ethyl erythro-2-acetamido-3-[6-(1-hexadecynyl)-2-pyridinyl]-3-hydroxypropionate A solution of 6-(1-hexadecynyl)-2-pyridinecarboxaldehyde (17.4 g), acetamidomalonic acid monoethyl ester (10.6 g), and triethylamine (5.4 ml) in dry tetrahydrofuran (85 ml) was stirred at room temperature for 3 days, under nitrogen. The reaction mixture was evaporated and the residue was dissolved in ethyl acetate. The solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was purified on a silica gel column, eluting with 2:1- to 1:1-hexane:ethyl acetate. The appropriate fractions were collected and evaporated. The residue was recrystallized from ethanol and then 85% ethanol to give 12.8 g (50.9%) of product, mp 82.5-84°C. Analysis: Calculated for C₂₈H₄₄N₂O₄: 71.15%C 9.38%H 5.93%N Found: 70.86%C 9.18%H 5.82%N EXAMPLE 16 erythro-N-{1-[6-(1-Dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide To a solution of ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxypropionate (20.3 g) in dry tetrahydrofuran (250 ml) 2.0 M lithium borohydride:tetrahydrofuran (30 ml) was added at 0°, under nitrogen. The reaction mixture was stirred at room temperature overnight. The mixture was chilled and 1:1-methanol:water (100 ml) was added slowly followed by glacial acetic acid (3.5 ml) in 1:1-methanol:water (50 ml) until a pH of 6.5 was obtained. The solution was stirred at room temperature for 2 hrs, the solvents were evaporated, and the residue was azeotroped with methanol (5 x 100 ml). The residue was slurried with 7.5% sodium bicarbonate solution (65 ml) (pH 8.5), extracted into 3:1-chloroform:2-propanol, and concentrated. The residue was flash chromatographed on silica gel, eluting with 0.5% methanol:ethyl acetate. The appropriate fractions were collected and evaporated. Recrystallization of the residue from hexane:ethyl acetate/1:1 gave 15.5 g (85.0%) of product, mp 86-88°C. Analysis: Calculated for C₂₂H₃₄N₂O₃: 70.55%C 9.15%H 7.48%N Found: 70.78%C 9.35%H 7.49%N EXAMPLE 17 Ethyl erythro-2-acetamido-3-(6-decyl-2-pyridinyl)-3-hydroxypropionate Ethyl erythro-2-acetamido-3-[6-(1-decynyl)-2-pyridinyl]-3-hydroxypropionate (2.7 g) in ethanol (65 ml) was reduced using 5% palladium-on-charcoal (0.7 g) in a Parr hydrogenator at 40 psi of hydrogen. After 2.5 hrs, the catalyst was collected, the filtrate was evaporated, and the residue was recrystallized from ethyl acetate to give 2.11 g (77.6%) of product, mp 67-68.5°C. Analysis: Calculated for C₂₂H₃₆N₂O₄: 67.32%C 9.24%H 7.14%N Found: 66.96%C 9.13%H 7.08%N EXAMPLE 18 erythro-N-[1-(6-Decyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide erythro-N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}-acetamide (4.0 g) in ethanol (100 ml) was reduced using 5% palladium-on-charcoal (0.1 g) in a Parr hydrogenator at 40 psi of hydrogen. After two hrs, the catalyst was collected, the solvent was evaporated, and the residue was recrystallized from ethyl acetate to give 3.69 g (91%) of product, mp 94-96°C. Analysis: Calculated for C₂₀H₃₄N₂O₃: 68.54%C 9.78%H 7.99%N Found: 68.36%C 9.72%H 7.94%N EXAMPLE 19 threo-2-Amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane threo-N-{1-[6-(1-Decynyl)-2-pyridinyl]-1,3-diacetyloxy-2-propanyl}acetamide (1.0 g) in ethanol (55 ml) was reduced using 5% palladium-on-charcoal (0.06 g) in a Parr hydrogenator at 40 psi of hydrogen. After two hrs, the catalyst was collected, and the solvent was evaporated to give 0.95 g (94%) of threo-N-[3-(6-decyl-2-pyridinyl)-1,3-diacetyloxy-2-propanyl]acetamide. The acetamide (0.95 g), hydrazine hydrate (40 ml), and ethanol (20 ml) was heated under reflux for 25 hrs, under nitrogen. The reaction mixture was cooled, water (30 ml) was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel eluting with 980:20:2- to 970:30:2-trichloromethane:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate, washed with half-saturated sodium chloride solution, dried, filtered, and the filtrate was evaporated to give 0.50 g (72%) of product, mp 76-78°C. Analysis: Calculated for C₁₈H₃₂N₂O₂: 70.09%C 10.46%H 9.08%N Found: 70.02%C 10.63%H 8.85%N EXAMPLE 20 erythro-2-Amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane erythro-N-[1-(6-Decyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide (6.0 g), hydrazine hydrate (60 ml), and ethanol (15 ml) were refluxed for 20 hrs., under nitrogen. The reaction mixture was cooled, water (75 ml) was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layers were washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was combined with 1.44 g from two other experiments, and was chromatographed on silica gel eluting with 950:50:3- to 900:100:5- trichloromethane:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate (150 ml) and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated to give 5.60 g (79%) of product, mp 52-55°C. Analysis: Calculated for C₁₈H₃₂N₂O₂: 70.09%C 10.46%H 9.08%N Found: 69.63%C 10.29%H 8.87%N EXAMPLE 21 Ethyl erythro-2-acetamido-3-(6-dodecyl-2-pyridinyl)-3-hydroxypropionate Ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxypropionate (2.0 g) in ethanol (80 ml) containing of 5% palladium-on-carbon (0.06 g) was reduced in a Parr hydrogenator at 40 psi of hydrogen. After two hrs, the catalyst was filtered, the filtrate was evaporated, and the residue was recrystallized from ethyl acetate to give 1.42 g (70.3%) of product, mp 71-73°C. Analysis: Calculated for C₂₄H₄₀N₂O₄: 68.54%C 9.59%H 6.66%N Found: 68.74%C 9.46%H 6.69%N EXAMPLE 22 erythro-N-[1-(6-Dodecyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide erythro-N-{1-[6-(1-Dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (6.05 g) in ethanol (120 ml) containing 5% palladium-on-carbon (0.15 g) was reduced in a Parr hydrogenator at 30 psi of hydrogen. After two hrs, the catalyst was filtered, the filtrate was evaporated, and the residue was recrystallized from ethyl acetate to give 5.90 g (96.4%) of product, mp 99-100.5°C. Analysis: Calculated for C₂₂H₃₈N₂O₃: 69.80%C 10.12%H 7.40%N Found: 69.71%C 10.37%H 7.34%N EXAMPLE 23 erythro-2-Amino-1-(6-dodecyl-2-pyridinyl)-1,3-propanediol erythro-N-[1-(6-Dodecyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide (3.8 g), hydrazine hydrate (35 ml), and ethanol (20 ml) were refluxed under nitrogen for 24 hrs. The reaction mixture was cooled, water (50 ml) was added, and the mixture was extracted with chloroform (3 x 65 ml). The extracts were washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3-chloroform:methanol:2N ammonium hydroxide. The residue was dissolved in ethyl acetate and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated to give 2.10 g (62%) of product, mp 61-64°C . Analysis: Calculated for C₂₀H₃₆N₂O₂: 71.38%C 10.78%H 8.32%N Found: 71.04%C 10.95%H 8.07%N EXAMPLE 24 erythro-N-1-(6-Hexyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide erythro-N-{1-[6-(1-Hexynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (5.80 g) in ethanol (125 ml) was hydrogenated using 0.15 g of 5% palladium-on-carbon in a Parr system at 40 psi. After 2.5 hours, the catalyst was collected, the filtrate was evaporated, and the residue was recrystallised from ethyl acetate to give 5.2 g (88.6%) of product, mp 75-76.5°C. Analysis: Calculated for C₁₆H₂₆N₂O₃: 65.28%C 8.90%H 9.52%N Found: 65.18%C 8.78%H 9.50%N EXAMPLE 25 N,O,O-Tribenzyloxycarbonyl-erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-propanediol erythro-2-Amino-1-(6-decyl-2-pyridinyl)-1,3-propanediol (1.50 g), N-benzyloxycarbonyloxysuccinimide (4.00 g) and triethylamine (2.23 ml) in dry tetrahydrofuran (60 ml) was stirred at room temperature for 9 days, under nitrogen. Additonal N-benzyloxycarbonyloxysuccinimide (4.00 g) was added and stirring was continued for 3 days. The reaction mixture was evaporated. The residue was dissolved in ethyl acetate and the solution was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica gel, 9:1 hexane:ethyl acetate). The appropriate fractions were collected and evaporated to give 1.87 g (54%) of product. Analysis: Calculated for C₄₂H₅₀N₂O₈: 70.96%C 7.09%H 3.94%N Found: 71.00%C 6.92%H 3.77%N EXAMPLE 26 Ethyl erythro-2-acetamido-3-hydroxy-3-[3-(1-undecynyl)phenyl]propionate To a solution of 3-bromobenzaldehyde (30.3 g) and 1-undecyne (29.5 g) in triethylamine (120 ml) was added bis(triphenylphosphine)palladium(II) chloride (1.9 g) followed by copper(I) iodide (0.25 g). The mixture was stirred in the dark at 55°C for 6 hrs, under nitrogen. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate and filtered. The filtrate was washed with water and saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated to yield 45.8 g of 3-(1-undecynyl)benzaldehyde, as an oil. A solution of 3-(1-undecynyl)benzaldehyde (23.0 g), acetamidomalonic acid monoethyl ester (15.1 g), and triethylamine (11.2 ml) in dry tetrahydrofuran (150 ml) was stirred at room temperature for 48 hrs, under nitrogen. Additional acetamidomalonic acid monoethyl ester (7.6 g) and triethylamine (5.6 ml) were added and stirring was continued for 72 hrs. The reaction mixture was evaporated and the residue was purified on a silica gel column, eluting with 2:1-hexane:ethyl acetate to give 13.0 g (41%) of product. The product was dissolved in warm 3:2-ethanol:water and cooled. The precipitate was collected. The filtrate was concentrated and the residue was recrystallized from cyclohexane to give the analytical sample, mp 69-71°C Analysis: Calculated for C₂₄H₃₅NO₄: 71.79%C 8.79%H 3.49%N Found: 71.81%C 8.72%H 3.51%N EXAMPLE 27 Ethyl erythro-2-acetamido-3-[3-(1-dodecynyl)phenyl]-3-hydroxypropionate To a solution of 3-bromobenzaldehyde (26.5 g) and (25.0 g) 1-dodecyne in triethylamine (105 ml) was added bis(triphenylphosphine)palladium(II) chloride (1.73 g) followed by copper(I) iodide (0.24 g). The resultant mixture was stirred in the dark at 55°C for 7 hrs, under nitrogen. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate and filtered. The filtrate was washed with water and saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and concentrated to yield 37.7 g 3-(1-dodecynyl)benzaldehyde. The filtrate was an oil. A solution of 3-(1-dodecynyl)benzaldehyde (7.6 g), acetamidomalonic acid monoethyl ester (5.1 g), and triethylamine (3.8 ml) in dry tetrahydrofuran (35 ml) was stirred at room temperature for 48 hrs, under nitrogen. Additional acetamidomalonic acid monoethyl ester (2.6 g) and triethylamine (1.9 ml) were added and stirring for 72 hr. The mixture was evaporated, and the residue was purified on a silica gel column, eluting with 2:1-hexane:ethyl acetate to give 4.8 g (43%) of product. The product was dissolved in warm 3:2-ethanol:water and cooled. The precipitate was collected. The filtrate was concentrated and the residue was recrystallized from 1:2-ethyl acetate:hexane to provide the analytical sample, mp 80-82°C. Analysis: Calculated for C₂₅H₃₇NO₄: 72.26%C 8.97%H 3.37%N Found: 72.34%C 8.74%H 3.38%N EXAMPLE 28 cis-erythro-N-{1-[6-(1-Dodecenyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide erythro-N-{1-[6-(1-Dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (2.05 g) in ethanol (55 ml), 5% palladium-on-barium sulfate (0.02 g), and 0.04 g of quinoline was hydrogenated at atmospheric pressure until one equivalent of hydrogen (ca. 123 ml) was taken up. The catalyst was filtered, the filtrate was evaporated, and the residue (2.1 g) was combined with residue (3.5 g) from similar reactions. The combined residues were chromatographed on silica gel eluting with 1:2-to 1:4-hexane:ethyl acetate to give 1.58 g (28%) of product, mp 96-98°C. Analysis: Calculated for C₂₂H₃₆N₂O₃: 70.18%C 9.64%H 7.44%N Found: 70.17%C 9.67%H 7.43%N EXAMPLE 29 5-(1-Dodecynyl)-2-thiophenecarboxaldehyde A solution of 1-dodecyne (28.7 g), 5-bromo-2-thiophenecarboxaldehyde (30.0 g) and triethylamine (47.7 g) in dry tetrahydrofuran (75 ml) was degassed and stirred at room temperature under a nitrogen atmosphere. bis(Triphenylphosphine)palladium(II)chloride (two mole percent) followed by copper(I)iodide (one mole percent) was added to the mixture. The mixture was degassed again and stirred at room temperature for three hrs, under nitrogen. The precipitate was collected and washed with ethyl acetate, and the filtrate was evaporated. The residue was distilled in a kugelrohr (oven temp=175°C/0.1 mm Hg) to give 27.1 g (62%) of product, as a oil. A portion of the oil was purified by flash chromatography (silica; 7:3-hexane-dichloromethane) and dried at 50°C under vacuum for three hrs to give the analytical sample Analysis: Calculated for C₁₇H₂₄OS: 73.86%C 8.75%H Found: 73.86%C 8.72%H EXAMPLE 30 Ethyl erythro-2-acetamido-3-[5-(1-dodecynyl)-2-thienyl]-3-hydroxypropionate A slurry of 5-dodecynyl-2-thiophenecarboxaldehyde (31.8 g), acetamidomalonic acid monoethyl ester (21.7 g), and dry tetrahydrofuran (150 ml) was degassed and cooled to 0°C. Triethylamine (5% excess) was added, the solution was degassed, and the reaction mixture was stirred at room temperature for 2 days, under nitrogen. Additional acetamidomalonic acid monoethyl ester (21.7 g) and triethylamine (5% excess) were added, and the reaction mixture was stirred at room temperature for 5 days, under nitrogen. The mixture was evaporated, and the residue was purified by flash chromatography (silica, 1:1-ethyl acetate:hexanes). The appropriate fractions were collected and evaporated. The residue was recrystallized from ether and from ethyl acetate-hexane to give 29.5 g (61%) of product, mp 81-83°C. Analysis: Calculated for C₂₃H₃₅NO₄S: 65.53%C 8.37%H 3.32%N Found: 65.36%C 8.25%H 3.30%N EXAMPLE 31 erythro-N-[ 1 -[5-(1-dodecynyl)-2-thienyl]-1,3-dihydroxy-2-propanyl]acetamide A solution of ethyl erythro-2-acetamido-3-[5-(1-dodecynyl)-2-thienyl]-3-hydroxypropionate (15.0 g) in dry tetrahydrofuran (150 ml) was stirred at 0°C, under nitrogen, as 2M lithium borohydride in tetrahydrofuran (22.3 ml) was added dropwise. The reaction mixture was stirred at room temperature for 3 days, under nitrogen. The pH of the mixture was adjusted to 6 with glacial acetic acid, and the mixture was evaporated. The residue was diluted with water (100 ml) and extracted with ethyl acetate. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica, 1-5% methanol-ethyl acetate). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate-hexane to give 9.6 g (71%) of product, mp 83-85°C. Analysis: Calculated for C₂₁H₃₃NO₃S: 66.45%C 8.76%H 3.69%N Found: 66.47%C 8.53%H 3.75%N EXAMPLE 32 erythro-2-Amino-1-[5-(1-dodecynyl)-2-thienyl]-1,3-propanediol A solution of erythro-N-[1-[5-(1-dodecynyl)-2-thienyl]-1,3-dihydroxy2-propanyl]acetamide (3.00 g), 2N sodium hydroxide solution (100 ml) and 95% ethanol (50 ml) was stirred at 65°C overnight. After cooling to room temperature, the mixture was evaporated, and the residue was diluted with sodium bicarbonate solution (250 ml). The mixture was extracted with 3:1-chloroform:isopropanol and the combined organic layers were dried anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica gel, 90:9:1-dichloromethane: methanol:ammonium hydroxide). The appropriate fractions were collected and evaporated. The residue was crystallized from ethyl acetate:hexane to give 1.4 g (53%) of product, mp 77-78°C. Analysis: Calculated for C₁₉H₃₁NO₂S: 67.61%C 9.26%H 4.15%N Found: 67.61%C 8.63%H 4.16%N EXAMPLE 33 erythro-N-[1-[5-(1-Dodecyl)-2-thienyl]-1,3-dihydroxy-2-propanyl]acetamide A mixture of erythro-N-[1-[5-(1-dodecynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (8.00 g), 5% palladium-on-carbon (400 mg), and absolute ethanol (500 ml) was shaken on a Parr hydrogenator under 50 psi of hydrogen for three hrs. The catalyst was collected. Fresh catalyst (400 mg) was added to the filtrate and the mixture was shaken under 50 psi of hydrogen overnight. The mixture was filtered through a bed of celite, and the filter cake washed with ethanol. The filtrate was evaporated, and the residue was recrystallized from ethyl acetate to give 7.3 g (90%) of product, m.p. 104-106°C. Analysis: Calculated for C₂₁H₃₇NO₃S: 65.75%C 9.72%H 3.65%N Found: 65.45%C 9.58%H 3.67%N EXAMPLE 34 erythro-2-Amino-1-[5-(1-dodecyl)-2-thienyl]-1,3-propanediol A solution of erythro-N-[3-[5-(1-dodecyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (3.00 g), hydrazine monohydrate (35 ml) and absolute ethanol (25 ml) was stirred at 70°C for 48 hrs, under nitrogen. The reaction mixture was cooled to room temperature, poured into 300 ml of dilute sodium bicarbonate solution (300 ml), and extracted with chloroform. The combined organic layers were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica; 90:9:1-dichloromethane:methanol:ammonium hydroxide). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate:hexane to give 1.4 g (52%) of product, m.p.89-90°C. Analysis: Calculated for C₁₉H₃₅NO₂S: 66.81%C 10.33%H 4.10%N Found: 66.48%C 10.37%H 4.11%N EXAMPLE 35 Ethyl erythro-2-acetamido-3-(3-dodecyl-5-isoxazolyl)-3-hydroxypropionate A mixture of 3-dodecyl-5-isoxazolecarboxaldehyde (5.72 g) and acetaminomalonic acid monoethylester (4.06 g) in dry tetrahydrofuran (75 ml) was cooled to 0°, with stirring, and triethylamine (2.29 g) was added. The reaction mixture was allowed to warm to room temperature and was stirred for 16 hrs. The solution was evaporated and the residue was purified by flash chromatography (silica gel, 2:1-ethyl acetate:hexanes). The appropriate fractions were collected and evaporated. Recrystallization of the residue from ethyl acetate:hexane gave 4.65 g (52.6%) of product, mp 87-89°C. Analysis: Calculated for C₂₂H₃₈N₂O₅: 64.36%C 9.33%H 6.82%N Found: 64.55%C 9.08%H 6.76%N EXAMPLE 36 erythro-N-[1-[3-(1-Dodecyl)-5-isoxazolyl]-1,3-dihydroxy-2-propyl]acetamide. To a solution of freshly prepared calcium borohydride (0.61 g) (from calcium hydride and borane-dimethyl sulfide) in dry tetrahydrofuran (70 ml) was added a solution of ethyl erythro-2-acetamido-3-(3-dodecyl-5-isoxazolyl)-3-hydroxypropionate (2.4 g) in dry tetrahydrofuran (20 ml). The reaction mixture was stirred at room temperature for 3 hrs. The reaction was quenched with 90:10:5-mixture of water, methanol, acetic acid, and extracted with chloroform. The solution was evaporated and the residue was recrystallized twice from ethyl acetate-hexane to give 1.23 g (57.1%) of product, mp 88-90°C. Analysis: Calculated for C₂₀H₃₆N₂O₄: 65.19%C 9.85%H 7.60%N Found: 65.17%C 9.60%H 7.60%N EXAMPLE 37 Ethyl erythro-2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate A solution of 6-bromo-2-pyridinecarboxaldehyde (5.6 g), acetamidomalonic acid monoethyl ester (5.67 g), and triethylamine (4.2 ml) in dry tetrahydrofuran (40 ml) was stirred at room temperature overnight, under nitrogen. The reaction mixture was evaporated and the mixture was purified on a silica gel column, eluting with 1:1-hexane:ethyl acetate to give 7.9 g (80%) of product as a mixture of two diastereomers. Recrystallization from toluene, followed by ethyl acetate gave 2.15 g (21.6%) of the erythro product, mp 98-100°C. Analysis: Calculated for C₁₂H₁₅BrN₂O₄: 43.52%C 4.57%H 8.46%N Found: 43.56%C 4.53%H 8.42%N EXAMPLE 38 erythro-N-[1-(6-Bromo-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide To a 2:1-erythro:threo mixture of ethyl 2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (11.4 g) in dry tetrahydrofuran (60 ml) was added slowly 2.0 M lithium borohydride/tetrahydrofuran (20.6 ml) at 0°, under nitrogen, and the mixture was stirred at room temperature overnight. The reaction mixture was chilled, and 1:1-methanol:water (100 ml) was added slowly followed by glacial acetic acid (2 ml) until pH 6.5 was obtained. The mixture was evaporated and the residue azeotroped with methanol (6 x 50 ml). The residue was slurried with 7.5% sodium bicarbonate solution (40 ml) (pH 8.5), extracted with 3:1-trichloromethane:isopropanol, filtered, and the filtrate was concentrated. The residue was flash chromatographed on silica gel eluting with 19:1-ethyl acetate:methanol to give 8.9(93.7%) of product. Recrystallization from ethanol gave the analytical sample of the erythro-diastereomer, mp 134.5-136.5°C. Analysis: Calculated for C₁₀H₁₃BrN₂O₃: 41.54%C 4.53%H 9.69%N Found: 41.64%C 4.54%H 9.64%N EXAMPLE 39 6-(1-Hexadecynyl)-2-pyridinecarboxaldehyde A solution of 6-bromo-2-pyridinecarboxaldehyde (12.3 g), 1-hexadecyne (16.1 g), triethylamine (20.0 g), bis(triphenylphosphine)palladium(II)chloride (0.92 g), and copper(I)iodide (0.13 g) in dry tetrahydrofuran (55 ml) was heated at 50°C for 29 hrs, under nitrogen. The reaction mixture was cooled to room temperature, filtered, and the filter cake was washed with ethyl acetate. The filtrate was evaporated and the residue was taken up in ethyl acetate (100 ml). The mixture was washed with 1:1 -water:saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed on silica gel, eluting with 1% ethyl acetate:hexanes. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated to give 11.5 g (53.5%) of product, mp 38.5-40°C. Analysis: Calculated for C₂₂H₃₃NO: 80.68%C 10.16%H 4.28%N Found: 80.44%C 10.00%H 4.30%N EXAMPLE 40 3-(1-Dodecyl)-5-isoxazolemethanol To a solution of 1-nitrotridecane (10.5 g) and O-trimethylsilyl-propynol (5.88 g) in dry benzene (100 ml) was added dropwise a solution of freshly distilled phenylisocyanate (10.9 g) and triethylamine (5.56 g) in dry benzene (40 ml) at 40 °C, with mechanical stirring. The mixture was heated to 60°C for 3.5 hr, cooled, and filtered. The filtrate was evaporated, taken up in tetrahydrofuran (300 ml) and 1.0M tetrabutylammonium fluoride (8 ml) was added. After 30 mins, the mixture was evaporated and the residue was purified by flash chromatography (silica gel, 2% methanol:dichloromethane). The appropriate fractions were collected and evaporated to give 10.5 g (86%) of product, mp 61-63°C. Analysis: Calculated for C₁₆H₂₉NO₂: 71.87%C 10.93%H 5.24%N Found: 71.92%C 11.10%H 5.19%N EXAMPLE 41 3-(1-Dodecyl)-5-isoxazolecarboxaldehyde A solution of oxalyl chloride (28.8 ml) in dry dichloromethane (100 ml) was cooled to -60°C and a solution of dimethylsulfoxide (8.9 ml) in dichloromethane (30 ml) was added, followed by a slurry of 3-(1-dodecyl)-5-isoxazolemethanol (14.0 g) in dry dichloromethane (200 ml). The mixture was stirred at -60°C for 1 hr, quenched with triethylamine (87 ml) and allowed to warm to room temperature. The solution was poured into water (300 ml) and extracted with dichloromethane. The organic phases were washed with dilute citric acid solution, dried, filtered, and the filtrate was evaporated. The residue was passed through a short pad of silica gel using dichloromethane as the eluent. The solution was evaporated and the residue was recrystallized from ether-hexane to give 11.5 g (78%) of product, mp 53-54°C. Analysis: Calculated for C₁₆H₂₇NO₂: 72.41%C 10.25%H 5.28%N Found: 72.22%C 10.59%H 5.24%N EXAMPLE 42 erythro-N-{1-[6-(1-Hexadecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-{6-(1-hexadecynyl)-2-pyridinyl]-3-hydrox ypropionate (11.1 g), in tetrahydrofuran (100 ml) dry was added slowly 2.0 M lithium borohydride/tetrahydrofuran (11.8 ml) at 0° under nitrogen. The reaction mixture was stirred at ambient temperature for 2.5 hrs, chilled, and 1:1 -methanol:water (60 ml) and glacial acetaic acid (1.4 ml) was added slowly until a pH of 6.5 was obtained. The mixture was then strirred at ambient temperature for 0.5 hr and evaporated. The residue was azeotroped with methanol (4 x 40 ml), slurried with 7.5% sodium bicarbonate solution (25 ml) (pH 8.5), and the mixture was extracted with 3:1-chloroform:2-propanol. The solution was concentrated and the residue was flash chromatographed on silica gel, eluting with 99:1-ethyl acetate:methanol. The appropriate fractions were collected and evaporated. Recrystailization gave 8.57 g (84.4%) of product, mp 88-90°C. Analysis: Calculated for C₂₆H₄₂N₂O₃: 72.52%C 9.83%H 6.51%N Found: 72.55%C 9.46%H 6.54%N EXAMPLE 43 erythro-N-[1,3-Diacetyloxy-1-(6-hexadecyl-2-pyridinyl)-2-propanyl]acetamide A mixture of N-{1-[6-(1-hexadecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl }acetamide. (7.26 g, 5:2-erythro:threo mixture), acetic anhydride (10.5 g), triethylamine (15.5 g), and 4-dimethylaminopyridine (0.21 g), in tetrahydrofuran (100 ml) was stirred at ambient temperature overnight. The reaction mixture was evaporated, methanol was added, and the mixture was warmed at 50°C for 20 min, and then was concentrated. A solution of 7.5% sodium bicarbonate solution was added to the residue until a pH of 8.5 was obtained. The mixture was extracted with chloroform. The organic extract was dried over anhydrous magnesium sulfate, filtered and the filtrate was concentrated. The residue was flash chromatographed, eluting with 2:1 to 1:1-hexane:ethyl acetate. The appropriate fractions were collected and evaporated to yield 5.54 g (64%) of erythro-N-[1,3-diacetyloxy-1-(6-hexadecynyl-2-pyridinyl)-2-propanyl]acetamide. A mixture of erythro-N-[1,3-diacetyloxy-1-(6-hexadecynyl-2-pyridinyl-2-propanyl]acetamide (5.4 g) in ethanol (150 ml) and 5% palladium-on-carbon (0.20 g) was shaken on a Parr hydrogenator under 35 psi of hydrogen for 2.5 hrs. The catalyst was collected and the filtrate was evaporated. The residue was chromatographed to give 4.1 g (75%; 48% overall) of product, mp 79-80.5°C. Analysis Calculated for C₃₀H₅₀N₂O₅: 69.46%C 9.72%H 5.40%N Found: 69.81%C 9.60%H 5.41%N EXAMPLE 44 erythro-N-[1-(6-Hexadecyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]acetamide A mixture of erythro-N-{1-[6-(1-hexadecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide (3.9 g), ethanol (125 ml) and 5% palladium-on-carbon (0.20 g) was shaken on a Parr hydrogenator under 35 psi of hydrogen for 2 hrs. The catalyst was collected and the filtrate was evaporated. The residue was recrystallized from ethyl acetate to give 3.6 g (91%) of product, mp 98-101°C. Analysis: Calculated for C₂₆H₄₆N₂O₃: 71.85%C 10.67%H 6.44%N Found: 71.92%C 10.75%H 6.52%N EXAMPLE 45 erythro-2-Amino-(6-hexadecyl-2-pyridinyl)-1,3-propanediol erythro-N-[1-(6-hexadecyl-2-pryidinyl)-1,3-dihydroxy-2-propanyl]acetamide (3.0 g), hydrazine hydrate (35 ml), and ethanol (25 ml) were heated under reflux, under nitrogen, for 28 hrs. The reaction mixture was cooled, water (40 ml) was added, and the mixture was extracted with chloroform. The combined extracts were washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3-chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and concentrated. The residue was dissolved in ethyl acetate and the solution was washed with half-saturated sodium chloride solution, dried, over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was azeotroped with toluene to give 1.37 g (50%) of product, mp 67-69°C. Analysis: Calculated for C₂₄H₄₄N₂O₂: 73.42%C 11.30%H 7.13%N Found: 73.25%C 11.14%H 7.04%N EXAMPLE 46 Ethyl threo-2-acetamido-3-(6-bromo-2-pyridlnyl)-3-hydroxypropionate A solution of 6-bromo-2-pyridinecarboxaldehyde (30.3 g), acetamidomalonic acid monoethyl ester (34.1 g), and triethylamine (16.6 g) in dry tetrahydrofuran (170 ml) was stirred under nitrogen at ambient temperature overnight. The reaction mixture was concentrated and the residue was azeotroped three times with ethyl acetate, and then recrystallized from ethyl acetate to remove 36.4 g of ethyl erythro-2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxyproprionate. The filtrate was chromatographed on a silica gel column, eluting with 3:2 to 1:1-hexane:ethyl acetate. The appropriate fractions were collected and concentrated. The residue was recrystallized from ethyl acetate to give 1.0 g (2.0%) of product, mp 144-146°C. Analysis: Calculated for C₁₂H₁₅BrN₂O₄: 43.52%C 4.57%H 8.46%N Found: 44.02%C 4.52%H 8.39%N EXAMPLE 47 6-(1-Undecynyl)pyridine-2-carboxaldehyde A solution of 6-bromopyridine-2-caboxaldehyde (15.0 g), 1-undecyne (12.9 g), triethylamine (24.5 g), bis(triphenylphosphine)palladium(II)chloride (1.1g, 2%), and copper(I)iodide (0.15g, 1%) in dry tetrahydrofuran (60 ml) was heated under nitorgen at 55°C for 10 hrs. The reaction mixture was filtered, the filter cake was washed with ethyl acetate, and the filtrate was evaporated. The residue was dissolved in ethyl acetate, and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was flash chromatographed on silica gel, eluting with 0%-2%-ethyl acetate:hexane. The appropriate fractions were collected and evaporated to yield 17.5 g (84.0%) of product. Analysis: Calculated for C₁₇H₂₃NO: 79.33%C 9.01%H 5.44%N Found: 79.03%C 9.36%H 5.14%N EXAMPLE 48 Ethyl erythro-2-acetamido-3-hydroxy-3-[6-(1-undecynyl)-2-pyridinyl]propionate A mixture of ethyl erythro-2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (20.8 g), 1-undecyne (1 1.5 g), triethylamine (12.7 g), bis(triphenylphosphine)palladium chloride (0.88 g), and cuprous iodide (0.12 g) in dry tetrahydrofuran (100 ml) was heated at 55°C for 4 hrs under nitrogen. Additional 1-undecyne (2.9 g), triethylamine (3.2 g), bis(triphenylphosphine)palladium chloride (0.44 g), and cuprous iodide (0.06 g) were added at ambient temperature, and the reaction mixture was heated an additional 5 hrs. The reaction mixture was evaporated and the residue was dissolved in ethyl acetate. The solution was washed with half-saturated sodium chloride solution and the organic phase was flash chromatographed on silica gel, eluting with 3:2 to 1:1-hexane:ethyl acetate. The appropriate fractions were collected and evaporated. Recrystallization of the residue from ethyl acetate save 16.0 g (63.4%) of product, mp 92-93°C. Analysis: Calculated for C₂₃H₃₄N₂O₄: 68.63%C 8.51%H 6.96%N Found: 68.58%C 8.94%H 6.94%N EXAMPLE 49 erythro-N-{1,3-Dihydroxy-1-[6-(1-undecynyl)-2-pyridinyl]-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-hydroxy-3-[6-(-1-undecynyl)-2-pyridinyl]propionate (17.9 g), in dry tetrahydrofuran (150 ml) was added 2.0 M lithium borohydride/tetrahydrofuran (22 ml) at 0°C under nitrogen. The reaction mixture was chilled, stirred at ambient temperature overnight, and 1:1-methanol:water (30 ml) was added followed by of glacial acetic acid (2.8 ml) in 1:1-methanol:water (30 ml) until a pH of 6.4 was obtained. The solution was stirred at ambient temperature for 1 hr, evaporated, and the residue was azeotroped with methanol. The residue was slurried with 75% sodium bicarbonate solution (pH 8.5), extracted with 3:1-chloroform:2-propanol, and concentrated. The residue was flash chromatographed on silica gel, eluting with 0.5%-1% methanol:ethyl acetate. The appropriate fractions were collected and concentrated. The residue was recrystallized from 1:1-hexane:ethyl acetate to give 12.1 g (75.4%) of product, mp 95-96.5°C. Analysis: Calculated for C₂₁H₃₂N₂O₃: 69.97%C 8.95%H 7.77%N Found: 69.84%C 8.87%H 7.71%N EXAMPLE 50 (Z)-erythro-N-{1,3-Dihydroxy-1-{6-(1-octenyl)-2-pyridinyl]-2-propanyl}acetamide A solution of ethyl erythro-2-acetamido-3-[6-(1-octynyl)-2-pyridinyl]-3-hydroxypropionate (9.0 g), in dry tetrahydrofuran (80 ml) and 2.0 M lithium borohydride/tetrahydrofuran (12.5 ml), was stirred under nitrogen at 0 0 C. The reaction mixture was stirred at ambient temperature overnight, chilled , and 1:1-methanol:water (40 ml) and acetic acid (1.5 ml) was added until a pH of 6.8 was obtained. The reaction mixture was stirred 1 hr, evaporated, and the residue was azeotroped with methanol. 7.5% Sodium bicarbonate solution was added until a pH of 8.5 was obtained. The mixture was extracted with 3:1-chloroform:-2-propanol and concentrated. The residue was flash chromatographed on silica gel, eluting with 1% methanol/ethyl acetate to give 7.6 g of material. Part of the above material (5.0 g) and 8.35 g from a similar experiment, acetic anhydride (25.7 g), triethylamine (38.2 g), and 4-dimethylaminopyridine (0.51 g) in tetrahydrofuran (180 ml ) was stirred at ambient temperature for 3 hrs. The reaction mixture was evaporated, methanol was added, and the mixture was warmed at 50°C for 20 min, and evaporated. A 7.5% sodium bicarbonate solution was added until a pH of 8.5 was obtained and the mixture was extracted with chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was flash chromatographed, eluting with 2:1-hexane:ethyl acetate. The appropriate fractions were collected and concentrated to yield 1.1 g of (Z)-erythro-N-{1,3-diacetyloxy-1[6-(1-octenyl)-2-pyridinyl]-2-propanyl}acetamide. A solution of (Z)-erythro-N-{1,3-diacetyloxy-1-[6-(1-octenyl)-2-pyridinyl]-2-propanyl}acetamide (1.1 g), potassium carbonate (0.44 g) in methanol (18 ml) was stirred for 1 hr. The reaction mixture was filtered and the filtrate was concentrated. The resiude was chromatographed on silica gel, eluting with 0.5% methanol/ethyl acetate. The appropriate fractions were collected and concentrated to give 0.5 g (3.7% overall) of product. Analysis: Calculated for C₁₈H₂₈N₂O₃: 67.47%C 8.81%H 8.74%N Found: 67.60%C 8.96%H 8.72%N EXAMPLE 51 erythro-N-[1,3-Diacetyloxy-1-(6-octyl-2-pyridinyl)-2-propanyl]acetamide A solution of erythro-N-(1,3-dihydroxy-1-1-{[6-(1-octynyl)-2-pyridinyl]-2-propanyl} acetamide (13.4 g), acetic anhydride (25.7 g), triethylamine (38.2 g), and 4-dimethylaminopyridine (0.51 g) in tetrahydrofuran (180 ml) was stirred at ambient temperature for 3 hrs. The reaction mixture was evaporated, methanol was added to the residue, and the solution was warmed at 50°C for 20 min and evaporated. A solution of 7.5% sodium bicarbonate solution was added until a pH of 8.5 was obtained, and the mixture was extracted with chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was flash chromatographed, eluting with 2:1 to 1:1-hexane:ethyl acetate. The appropriate fractions were collected and evaporated to yield 9.17 g of erythro-N-[1,3-diacetyloxy-1-(6-octynyl-2-pyridinyl)-2-propanyl]acetamide. A portion of erythro-N-[1,3-diacetyloxy-1-(6-octynyl-2-pyridinyl)-2-propanyl]acetamide (7.5 g) in ethanol (200 ml) and 5% palladium-on-carbon (0.25 g) was shaken on a Parr hydrogenator at 40 psi of hydrogen. After 1.5 hrs, the catalyst was collected and the filtrate was evaporated. The residue was chromatographed to give 6.0 g (78.5%, 43% overall) of product, mp 53-56°C. Analysis: Calculated for C₂₂H₃₄N₂O₅: 65.00%C 8.43%H 6.89%N Found: 65.07%C 8.32%H 6.88%N EXAMPLE 52 erythro-N-[1,3-Dihydroxy-1-(6-octyl-2-pyridinyl)-2-propanyl]acetamide. A solution of erythro-N-[1,3-diacetyloxy-1-(6-octyl-2-pyridinyl-2-propanyl]-acetamide (5.2 g), and potassium carbonate (0.88 g) in methanol (75 ml) was stirred for 1 hr. The precipitate was collected, and the filtrate was evaporated. 7.5% Sodium bicarbonate solution and 1 N hydrochloric acid was added until a pH of 8.5 was obtained. The mixture was extracted with 3:1-chloroform:2-propanol. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. Recrystallization of the residue from ethyl acetate gave 3.1 g (75.6%) of product, mp 85-86.5°C. Analysis: Calculated for C₁₈H₃₀N₂O₃: 67.05% 9.38%H 8.69%N Found: 66.98%C 9.74%H 8.65%N EXAMPLE 53 erythro-2-Amino-1-(6-octyl-2-pyridinyl)1,3-propanediol A solution of erythro-N-[1,3-dihydroxy-1-(6-octyl-2-pyridinyl)-2-propanyl]-acetamide. (3.8 g), hydrazine hydrate (35 ml), and ethanol (25 ml) was heated under reflux, under nitrogen, for 26 hrs. The reaction mixture was cooled, water (50 ml) was added, and the mixture was extracted with chloroform. The extract was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3-chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate and the solution was washed with half-saturated sodium chloride solution dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was azeotroped with toluene to give 2.47 g (75%) of product mp 38-40°C. Analysis: Calculated for C₁₆H₂₈N₂O₂·0.1H₂O: 68.10%C 10.07%H 9.93%N Found 67.88%C 10.18%H 9.74%N EXAMPLE 54 threo-2-Amino-1-(6-octyl-2-pyridinyl)-1,3-propanediol A mixture of erythro-and threo-N-{1,3-dihydroxy-1-[6-(1-octynyl)-2-pyridinyl]-2-propanyl}acetamide (13.4 g), acetic anhydride (25.7 g), triethylamine (38.2 g), and 4-dimethylaminopyridine (0.5 g) in tetrahydrofuran (180 ml) was stirred at ambient temperature for 3 hrs. The reaction mixture was evaporated, the residue was warmed with methanol (80 ml) for 20 min, and the mixture was evaporated. 7.5% Sodium bicarbonate solution was added to a pH of 8.5, and the solution extracted with chloroform. The extracts were dried, filtered, and the filtrate was evaporated. The residue was flash chromatographed. The appropriate fractions collected and evaporated to yield 2.4 g (14 %) of threo-N-{1,3-diacetyloxy-1-[6-(1-octynyl)-2-pyridinyl]-2-propanyl}acetamide. threo-N-{1,3-Diacetyloxy-1-[6-(1-octynyl)-2-pyridinyl]-2-propanyl}acetamide (2.4 g) in ethanol (75 ml) containing 0.12 g of 5% palladium-on-carbon was shaken on a Parr hydrogenator at 40 psi of hydrogen. After 3 hrs, the reaction mixture was filtered, and the filtrate was evaporated. The residue was flash chromatographed. The appropriate fractions were collected and evaporated to give 2.2 g (92%) of threo-N-[1,3-diacetyloxy-1-(6-octyl-2-pyridinyl)-2-propanyl]acetamide. A solution of threo-N-{1,3-diacetyloxy-1-[6-(1-octyl)-2-pyridinyl]-2-propanyl}acetamide (2.17 g) was stirred with potassium carbonate (70 mg), and methanol (25 ml) was stirred for 1 hr at ambient temperature, filtered, and the filtrate was evaporated. Water was added, the pH was adjusted to 8.5, and the mixture was extracted with 3:1 -chloroform:i-2-propanol. The extract was concentrated to give 1.6 g (94%) of threo-N-[1,3-diacetyloxy-1-(6-octyl-2-pyridinyl)-2-propanyl]acetamide, mp 71.5-74°C. A solution of threo-N-[1,3-diacetyloxy-1-(6-octyl-2-pyridinyl)-2-propanyl]acetamide (1.6 g), hydrazine hydrate (15 ml), and ethanol (15 ml) was heated winder reflux, under nitrogen for 23 hrs. The reaction mixture was cooled, water was added, and the mixture was extracted with chloroform. The extracts were washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 960:40:3-chloroform:methanol:2N ammonium hydroxide. the appropriate fractions were collected and evaporated to give 0.78 g (56.5%, 7.0% overall) of product, mp 74-77°C. Analysis: Calculated for C₁₆H₂₈N₂O₂: 68.53%C 10.06%H 9.99%N Found: 68.48%C 10.15%H 9.96%N EXAMPLE 55 erythro-2-Amino-1-(6-hexyl-2-pyridinyl)-1,3-propanediol A solution of erythro-2-[1-(6-hexyl-2-pyridinyl)-1,3-dihydroxy-2-propanyl]-acetamide (3.6 g), hydrazine hydrate (35 ml) and ethanol (25 ml) was heated under reflux, under nitrogen for 29 hrs. The reaction mixture was cooled, water (50 ml) was added, and the mixture was extracted with ethyl acetate. The extract was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3-chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate (80 ml), and the solution was washed with half-saturated sodium chloride solution, dried, filtered, and the filtrate was evaporated to give 2.02 g, (66%) of product. Analysis: Calculated for C₁₄H₂₄N₂O₂: 66.63%C 9.59%H 11.10%N Found: 65.91%C 9.42%H 10.82%N EXAMPLE 56 6-(7-Phenyl-1-heptynyl)pyridine-2-carboxaldehyde A solution of 6-bromopyridine-2-caboxaldehyde (30.0 g), 7-phenyl-1-heptyne (26.8 g), triethylamine (48.9 g), bis(triphenylphosphine)palladium(II)chloride (2.3 g, 2%), and copper(I)iodide (0.31 g, 1%) in dry tetrahydrofuran (100 ml) was heated under nitrogen at 55°C for 70 hrs. The reaction mixture was cooled to ambient temperature, filtered, and the filtrate was washed with ethyl acetate. The filtrate was evaporated. The residue was dissolved in ethyl acetate, the solution washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and the filtrate was concentrated. The residue was flash chromatographed on silica gel, eluting with 0.5% to 2%-ethyl acetate:hexane. The appropriate fractions were collected and concentrated to yield 29.5 g of the product. Analysis: Calculated for C₁₉H₁₉NO: 82.28%C 6.90%H 5.05%N Found: 82.00%C 6.94%H 5.02%N EXAMPLE 57 E thyl erythro-2-acetamido-3-hydroxy-3-[6-(7-phenyl-1-heptynyl)-2-pyridinyl]propionate A solution of 6-(7-phenyl-1-heptynyl)pyridine-2-carboxaldehyde (26.5 g), acetamidomalonic acid monoethyl ester (19.2 g), triethylamine (14.6 ml) in dry tetrahydrofuran (125 ml) was stirred at ambient temperature for 3 days, under nitrogen. The reaction mixture was evaporated, the residue was dissolved in ethyl acetate and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and evaporated. The residue was chromatographed on a silica gel column, eluting with 1:1 -hexane:ethyl acetate to give 32.9 g (82.0%) of a mixture of erythro- and threo-isomers. The mixture was recrystallized from 1:1 -hexane:ethyl acetate to give 4.7 g (11.5%) of product, mp 79.0-81°C. Analysis: Calculated for C₂₅H₃₀N₂O₄: 71.07%C 7.16%H 6.63%N Found: 71.27%C 6.89%H 6.63%N EXAMPLE 58 erythro-N-{1,3-Dihydroxy-1-[6-(7-phenyl-1-heptynyl)-2-pyridinyl]-2-propanyl}-acetamide To a solution of ethyl erythro-2-acetamido-3-hydroxy-3-[6-(7-phenyl-1-heptynyl)-2-pyridinyl]propionate (23.4 g) in dry tetrahydrofuran (200 ml) was added 2.0 M lithium borohydride/tetrahydrofuran (22 ml) at 0°C under nitrogen. The reaction mixture was stirred at ambient temperature overnight, chilled, and 1:1 -methanol:water (50 ml) was added followed by glacial acetic acid (2.5 ml) in 1:1 -methanol:water (30 ml) until a pH of 6.4 was obtained. The solution was stirred at ambient temperature for 1 hr, evaporated, and the residue was azeotroped with methanol. The residue was slurried with sodium bicarbonate (40 ml) (pH 8.5), saturated sodium chloride solution (40 ml) was added, and the mixture was extracted with 3:1 -chloroform:2-propanol. The extracts were concentrated. The residue was flash chromatographed on silica gel, eluting with 0.5% to 5% methanol:ethyl acetate. The appropriate fractions were collected and evaporated. Recrystallization of the residue from 1:1 -hexane:ethyl acetate gave 2.64 g (34%) of product, mp 83-85°C. Analysis: Calculated for C₂₃H₂₈N₂O₃: 72.61%C 7.42%H 7.36%N Found: 72.76%C 7.66%H 7.31%N EXAMPLE 59 Ethyl erythro-2-acetamido-3-hydroxy-3-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]propionate A mixture of ethyl erythro-2-acetamido-3-(6-bromo-2-pyridinyl)-3-hydroxypropionate (23.2 g), 5-phenyl-1-pentyne (12.1 g), triethylamine (10.6 g), bis(triphenylphosphine)palladium chloride (0.98 g), and cuprous iodide (0.13 g) in dry tetrahydrofuran (100 ml) was heated at 55°C for 1.5 hrs under nitrogen. Additional 5-phenyl-1-pentyne (6.1 g), triethylamine (7.1 g), bis(triphenylphosphine)palladium chloride (0.49 g), and cuprous iodide (0.07 g) were added, and the reaction mixture was heated overnight. The reaction mixture was filtered and the filtrate was evaporated. The residue was redissolved in ethyl acetate, washed with half-saturated sodium chloride solution, and flash chromatographed on silica gel, eluting with 1:1 -hexane:ethyl acetate. The appropriate fractions were collected. The residue was rechromatographed, eluting with 1%-methanol:chloroform to give 14.2 g (51.6%) of product. Analysis: Calculated for C₂₃H₂₆N₂O₄: 70.03%C 6.64%H 7.10%N Found: 69.30%C 6.75%H 6.94%N EXAMPLE 60 erythro-N-{1,3-Dihydroxy-1-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]-2-propanyl}-acetamide To a solution of ethyl erythro-2-acetamido-3-hydroxy-3-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]propionate (12.3 g) in dry tetrahydrofuran (100 ml) was added 2.0 M lithium borohydride/tetrahydrofuran (15.5 ml) at 0°C, under nitrogen. The reaction mixture was stirred at ambient temperature overnight, chilled, and 1:1-methanol:water (45 ml) and glacial acetic acid (1.8 ml) were added until a pH of 6.5 was obtained. The mixture was stirred at ambient temperature for 80 min. The reaction mixture was evaporated, the residue was azeotroped with methanol and slurried with 7.5% sodium bicarbonate solution (25 ml) (pH 8.5). The mixture was extracted with 3:1-chloroform:2-propanol, filtered, and the filtrate was concentrated. The residue was flash chromatographed on silica gel, eluting with 0.5% to 1%-methanol:ethyl acetate. The appropriate fractions were collected and concentrated to give 6.0 g (54.6%) of product, mp 91-95°C. Analysis: Calculated for C₁₂H₂₄N₂O₃: 71.57%C 6.86%H 7.95%N Found: 71.48%C 6.75%H 7.92%N EXAMPLE 61 erythro-N-{1,3-Dihydroxy-1-[6-(5-phenylpentyl)-2-pyridinyl]-2-propanyl}acetamide hydrate erythro-N-{1,3-Dihydroxy-1-[6-(5-phenyl-1-pentynyl-2-pyridinyl]-2-propanyl} acetamide (5.45 g) in ethanol (150 ml) containing 5% palladium-on-carbon (0.20 g) was shaken on a Parr hydrogenator at 40 psi of hydrogen. After 1.5 hrs, the catalyst was collected. The filtrate was evaporated, and the residue was chromatographed on silica gel, eluting with 0.5%-1% methanol acetate to give 2.8 g (50%) of product. Analysis: Calculated for C₂₁H₂₈N₂O₃·H₂O: 67.36%C 8.07%H 7.48%N Found: 67.95%C 8.02%H 7.53%N EXAMPLE 62 erythro-2-Amino-1-[6-(5-phenylpentyl)-2-pyridinyl]-1,3-propanediol hemihydrate A solution of erythro-N-{1,3-dihydroxy-1-[6-(5-phenylpentyl)-2-pyridinyl]-2--propanyl}acetamide (3.5 g), hydrazine hydrate (32 ml), and ethanol (25 ml) was heated under reflux, under nitrogen, for 26 hrs. The reaction mixture was cooled, water (40 ml) was added, and the mixture was extracted with chloroform. The extracts were washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. A mixture of the residue and 0.25 g from a similar experiment was chromatographed on silica gel, eluting with 970:30:2 to 950:50:3-chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in chloroform (100 ml), and the solution was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was dried at 70°C under high vacuum to give 2.23 g (64%) of product. Analysis: Calculated for C₁₉H₂₆N₂O₂·0.5H₂O: 70.56%C 8.41%H 8.66%N Found: 70.77%C 8.23%H 8.62%N EXAMPLE 63 erythro-N-{1,3-Dihydroxy-1-[3-(1-undecynyl)phenyl]-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-hydroxy-3-[3-(1-undecynyl)phenyl]propionate (7.3 g) in dry tetrahydrofuran (75 ml) was added 2.0 M lithium borohydride/tetrahydrofuran (11.4 ml) at 0°C, under nitrogen. The reaction mixture was chilled, stirred at ambient temperature overnight, and a mixture of glacial acetic acid (1.3 ml), methanol (25 ml) and water (25 ml) was added dropwise to a final pH of 6. The solution was concentrated and the residue was extracted with ethyl acetate. The extracts were dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. Trituration of the residue with 2:3-ether:hexane and recrystallization of the residue from ethyl acetate gave 1.9 g (29%) of product, mp 99-101°C. Analysis: Calculated for C₂₂H₃₃NO₃: 73.50%C 9.25%H 3.90%N Found: 73.56%C 9.05%H 3.93%N EXAMPLE 64 erythro-N-{1-[3-(1-Dodecynyl)phenyl]-1,3 dihydroxy-2-propanyl}acetamide To ethyl erythro-2-acetamido-3-[3-(1-dodecynyl)phenyl]-3-hydroxypropionate (24.0 g) in tetrahydrofuran (220 ml) was added 2 N lithium borohydride/tetrahydrofuran (29 ml) at 2°C, under nitrogen. The reaction mixture was chilled, stirred at ambient temperature for 2.5 hrs. and 1:1-methanol:water (100 ml) and glacial acetic acid (3.3 ml) was added slowly until a pH of 6.5 was obtained. The solution was stirred at ambient temperature for 0.5 hr, evaporated, and the residue was azeotroped with methanol. The residue was slurried with 7.5% sodium bicarbonate solution (50 ml) (pH 8.5),and the mixture was extracted with 3:1-chloroform:propanol. The extract was concentrated. The residue was flash chromatographed on silica gel, eluting with ethyl acetate. The appropriate fractions were collected and evaporated. Recrystallization of the residue from ethyl acetate gave 9.13 g (42.4%) of product, mp 93-95°C. Analysis: Calculated for C₂₃H₃₅NO₃: 73.96%C 9.44%H 3.75%N Found: 73.66%C 9.14%H 3.69%N EXAMPLE 65 erythro-N-[1-(3-Dodecylphenyl)-1,3-dihydroxy-2-propanyl]acetamide erythro-N-{1-(3-Dodecynyl)phenyl]-1,3-dihydroxy-2-propanyl}acetamide (4.4 g) in ethanol (100 ml) containing 5% palladium-on-carbon (0.02 g) was shaken on a Parr hydrogenator at 35 psi of hydrogen for 2.5 hrs. The catalyst was collected, the solvent evaporated, and the residue was recrystallized from ethyl acetate to give 4.1 g (90.6%) of product, mp 101-104°C. Analysis: Calculated for C₂₃H₃₉NO₃: 73.17%C 10.41%H 3.71%N Found: 72.82%C 10.36%H 3.54%N EXAMPLE 66 erythro-2-Amino-1-(3-dodecylphenyl)-1,3-propanediol erythro-N-[1-(3-Dodecylphenyl)-1,3-dihydroxy-2-propanyl]acetamide (2.9 g), hydrazine hydrate (25 ml), and ethanol (25 ml) were heated under reflux, under nitrogen for 22 hrs. The reaction mixture was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3-chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in ethyl acetate (75 ml), and the solution was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, evaporated, and the residue was azeotroped with toluene to give 1.35 g (52%) of product, mp 36-40°C. Analysis: Calculated for C₂₁H₃₇NO₂: 75.17%C 11.12%H 4.17%N Found: 75.14%C 11.18%H 4.12%N EXAMPLE 67 erythro N-[1-[5-(1-Dodecyl)-2-thienyl]-1,3-diacetoxy-2-propyl]acetamide A solution of erythro N-[1-[5-(1-dodecyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (12.0 g), acetic anhydride (19.2 g), triethylamine (28.4 g),and dimethylaminopyridine (0.4 g) in dry tetrahydrofuran (150 ml) was stirred at ambient temperature for 3 hrs. The reaction mixture was evaporated and the residue was dissolved in chloroform. The solution was washed with water, dried, filtered, and the filtrate was evaporated. The residue was dried to give 13.6 g (93.5%) of product, mp 105-107°C. Analysis: Calculated for C₂₅H₄₁NO₅S: 64.21%C 8.84%H 2.99%N Found: 64.33%C 8.92%H 3.02%N EXAMPLE 68 Ethyl erythro-2-acetamide-3-[5-(1-nonynyl)-2-thienyl]-3-hydroxypropionate A slurry of 5-nonynyl-2-thiophenecarboxaldehyde (40.0 g), acetamidomalonic acid monoethyl ester (32.3 g) and dry tetrahydrofuran (150 ml) was degassed and cooled to 0°C. Triethylamine (18.2 g) was added, the solution degassed, and the reaction mixture was stirred at room temperature under nitrogen for four days, Acetamidomalonic acid monoethyl ester (32.3 g) and triethylamine (18.2 g) were added, and the reaction mixture was stirred at room temperature under nitrogen for an additional four days. The reaction mixture was evaporated and the residue dried under vacuum. The residue was flash chromatographed (silica; 1:1-ethyl acetate:hexane). The appropriate fractions were collected and evaporated. The residue was crystallized from ether, then recrystallized twice from ethyl acetate to give 40.2 g (62%) of product, mp 104-106°c. Analysis: Calculated for C₂₀H₂₉NO₄S: 63.30%C 7.70%H 3.69%N Found: 63.30%C 7.64%H 3.71%N EXAMPLE 69 erythro-N-[1-[5-(1-Nonynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide A solution of ethyl erythro-2-acetamido-3-[5-(1-nonynyl)-2-thienyl]-3-hydroxypropionate (40.0 g) in dry tetrahydrofuran (150 ml) was stirred at 0°C under nitrogen as lithium borohydride (2.0 M in tetrahydrofuran, 68.5 ml) was added dropwise. The reaction mixture was stirred under a nitrogen atmosphere overnight, warming to room temperature. A solution of 50:50:8-methanol:water:acetic acid (108 ml) was added, with cooling in an ice-bath. The solution was neutralized with glacial acetic acid and evaporated. The residue was diluted with water and extracted with ethyl acetate. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed (silica; 2-4%-methanol-ethyl acetate). The appropriate fractions were collected and evaporated. The residue was recrystallized twice from ethyl acetate to give 29.9 g (84%) of product, mp 81-83°C. Analysis: Calculated for C₁₈H₂₇NO₃S: 64.06%C 8.06%H 4.15%N Found: 64.04%C 8.17%H 4.16%N EXAMPLE 70 erythro-2-Amino-1-[5-(1-nonynyl)-2-thienyl]-1,3-propanediol A solution of erythro-N-[1-[5-(nonynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (16.4 g), 2N sodium hydroxide solution (150 ml), and 95% ethanol (75 ml) was stirred at 70°C overnight. The reaction mixture was cooled to room temperature and acidified with glacial acetic acid. The solution was diluted with water (200 ml), basified with sodium bicarbonate solution and chilled. The precipitate was collected, and the filtrate was extracted with 4:1-chloroform:2-propanol. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was combined with the precipitate and flash chromatographed (silica, 90:9:1-dichloromethane:methanol:ammonium hydroxide) to give 11.8 g (82%) of product. A portion of product was crystallized from ether to give the analytical sample, mp 64-67°C. Analysis: Calculated for C₁₆H₂₅NO₂S: 65.05%C 8.53%H 4.74%N Found: 65.22%C 8.56%H 4.76%N EXAMPLE 71 erythro-N-[1-[5-(1-Nonyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide A mixture of erythro-N-[1-[5(1-nonynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (8.00 g), 5% palladium-on-carbon (800 mg), and absolute ethanol (500 ml) was shaken under 50 psi of hydrogen overnight. The catalyst was filtered through a bed of celite, and the filtrate was washed with ethanol. The filtrate was evaporated, and the residue was recrystallized twice from ethyl acetate to give 7.0 g (86%) of product, mp 98-100°c. Analysis: Calculated for C₁₈H₃₁NO₃S: 63.31%C 9.15%H 4.10%N Found: 63.03%C 9.14%H 4.01%N EXAMPLE 72 5-(6-Phenyl-1-hexynyl)-2-thiophenecarboxaldehyde A solution of 6-phenyl-1-hexyne (30.6 g), 5-bromo-2-thiophenecarboxaldehyde (37.0 ), and triethylamine (58.7 g) in dry tetrahydrofuran (75 ml) was degassed and stirred at room temperature under a nitrogen atmosphere. Two mole percent of bis(triphenylphosphine)palladium(II)chloride (2.7 g) followed by one mole percent of copper(I)iodide (0.4 g) was added, The mixture was degassed and stirred at room temperature under nitrogen overnight. The precipitate was filtered and washed with ethyl acetate. The filtrate was evaporated, and the residue was distilled to give 47.0 g (91%) of product. A two gram-portion of product was flash chromatographed (silica, 1:1 -toluene:hexane). The appropriate fractions were collected and evaporated. The residue was distilled in a kugelruhr oven (170°C/0.07 mm mercury) to give the analytical sample, as an oil. Analysis: Calculated for C₁₇H₁₆OS: 76.08%C 6.01%H Found: 75.54%C 6.04%H EXAMPLE 73 erythro-N-[1-[5-(6-Phenyl-1-hexynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide A solution of ethyl erythro-2-acetamido-3-[5-(6-phenyl-1-hexynyl)-2-thienyl]-3-hydroxypropionate (41.6 g) in dry tetrahydrofuran (150 ml) was stirred at 0°C, under nitrogen, as a solution of lithium borohydride (2.0 M in tetrahydrofuran, 66 ml) was added dropwise. The reaction mixture was warmed to room temperature and stirred under a nitrogen atmosphere for four hrs. A solution of 50:50:8 methanol:water:acetic acid (108 ml) was added with cooling in an ice-bath. Glacial acetic acid was added, and the solution was evaporated. Water was added to the residue, and the solution was extracted with ethyl acetate. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed (silica; 90:9:1 dichloromethane:methanol:2N ammonium hydroxide). The appropriate fractions were collected and evaporated. Recrystallization of the residue from ethyl acetate gave 31.5 g (84%) of product, mp 131-133°C. Analysis: Calculated for C₂₁H₂₅NO₃S: 67.90%C 6.78%H 3,77%N Found: 67.54%C 6.88%H 3.71%N EXAMPLE 74 erythro-2-Amino-1-[5-(6-phenyl-1-hexynyl)-2-thienyl]-1,3-propanediol A solution of erythro-N-[1-[5-(6-phenyl-1-hexynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (10.0 g), 1N sodium hydroxide solution (125 ml) and 95% ethanol (75 ml) was stirred at 65°C overnight. The reaction mixture was evaporated, and the residue was neutralized with glacial acetic acid. The solution was diluted with water (200 ml) and extracted with 4:1-chloroform:2-propanol. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed (silica, 90:9:1-dichloromethane:methanol:2N ammonium hydroxide). The appropriate fractions were collected and evaporated to give 7.8 g (88%) of product. A portion was crystallized from ethyl acetate-hexane to give the analytical sample, mp 130-140°C (dec). Analysis: Calculated for C₁₉H₂₃NO₂S: 69.27%C 7.04%H 4.25%N Found: 69.29%C 7.14%H 4.26%N EXAMPLE 75 4-(1-Dodecynyl)-2-thiophenecarboxaldehyde A solution of 1-dodecyne (23.9 g), 5-bromo-2-thiophenecarboxaldhyde (25.0 g) and triethylamine (39.7 g) in dry tetrahydrofuran (75 ml) was degassed and stirred at room temperature under a nitrogen atmosphere. Two mole percent of bis(triphenylphosphine)palladium(II)chloride (1.8 g) followed by one mole percent of copper(I)iodide (0.25 g) was added. The mixture was degassed and stirred at room temperature under nitrogen for three days. The precipitate was filtered, and the filter cake was washed with ethyl acetate. The filtrate was evaporated, and the residue was flash chromatographed (silica, 7:3-Hexane:dichloromethane). The appropriate fractions were collected and evaporated. The residue was dried at 50°C under vacuum for three hrs to give 35.5 g (98%) of product. Analysis: Calculate for C₁₇H₂₄OS: 73.86%C 8.75%H Found: 73.79%C 9.08%H EXAMPLE 76 Ethyl erythro-2-acetamide-3-[4-(1-dodecynyl)-2-thienyl]-3-hydroxypropionate A slurry of 4-(1-dodecynyl)-2-thiophenecarboxaldehyde (21.4 g), acetamidomalonic acid monoethyl ester (14.6 g), and dry tetrahydrofuran (100 ml) was degassed and cooled to 0°C. Triethylamine (8.23 g) was added, the solution degassed, and the reaction stirred at room temperature under nitrogen for five days. Additional acetamidomalonic acid monoethyl ester (14.6 g) and triethylantine (8.23 g) were added, and the reaction was stirred at room temperature under nitrogen for five days. The reaction mixture was evaporated, the residue dried under vacuum, and flash chromatographed (silica, 3:2-hexane:ethyl acetate). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate-hexane to 23.3 g (71%) of product, mp 79-81°C. Analysis: Calculated for C₂₃H₃₅NO₄S: 65.53%C 8.37%H 3.32%N Found: 65.63%C 7.96%H 3.34%N EXAMPLE 77 erythro-2-Amino-1-[4-(1-dodecyl)-2-thienyl]-1,3-propanediol A solution of erythro-N-[1-[4-(dodecyl)-2-thienyl]-1,3-dihydroxy-2-propyl]a-cetamide (6.35 g), 2N sodium hydroxide solution (100 ml) and 95% ethanol (50 ml) was stirred at 65°C overnight. The reaction mixture was cooled to room temperature and neutralized with glacial acetic acid, The solution was diluted with water (200 ml) and chilled. The precipitate was collected, and the filtrate was extracted with chloroform. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was combined with the precipitate and flash chromatographed (silica, 90:9:1-dichloromethane:methanol:2N ammonium hydroxide). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate to give 4.1 g (73%) of product, mp 99-100°C. Analysis: Calculated for C₁₉H₃₅NO₂S: 66.81%C 10.33%H 4.10%N Found: 66.70%C 10.40%H 4.11%N EXAMPLE 78 Ethyl erythro-2-acetamido-3-[5-(6-phenyl-1-hexynyl)-2-thienyl]-3-hydroxypropionate A slurry of 6-phenyl-1-hexynyl-2-thiophenecarboxaldehyde (45.0 g), acetamidomalonic acid monoethyl ester (31.7 g), and dry tetrahydrofuran (150 ml) was degassed and cooled to 0°C. Triethylamine (17.9 g) was added, the solution degassed, and the reaction mixture stirred at room temperature under nitrogen for two days. Additional acetamidomalonic acid monoethyl ester (31.7 g) and triethylamine (17.9 g) were added, and the reaction mixture was stirred at room temperature under nitrogen for an additional two days. The mixture was evaporated, the residue dried under vacuum, and flash chromatographed (silica, 1:1-ethyl acetate:hexane). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate-hexane to give 48.1 g (69%) of product, mp 90-92°C. Analysis: Calculated for C₂₃H₂₇NO₄S: 66.80%C 6.58%H 3.39%N Found: 66.48%C 6.59%H 3.33%N EXAMPLE 79 erythro-2-Amino-1-[4-(1-dodecynyl)-2-thienyl]-1,3-propanediol] acetate A solution of erythro-N-[1-[4-(dodecynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]-acetamide (4.30 g), 2N sodium hydroxide solution (100 ml), and 95% ethanol (50 ml) was stirred at 65°C overnight. The reaction mixture was cooled to room temperature and acidified with glacial acetic acid. The solution was diluted with water (200 ml) and chilled in the refrigerator. The precipitate was collected and the filtrate extracted with chloroform. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was combined with the precipitate and previously prepared material, and recrystallized twice from ethyl acetate to give 4.0 g (55%) of product, mp 120-122°C. Analysis: Calculated for C₂₁H₃₅NO₂S: 63.44%C 8.87%H 3.52%N Found: 63.32%C 8.71%H 3.50%N EXAMPLE 80 erythro-N-[1-[4-(1-Dodecyl)-2-thienyl]1,3-dihydroxy-2-propyl]acetamide A mixture of erythro-N-[1-[4-(1-dodecynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (8.00 g), 5% palladium-on-carbon (800 mg), and absolute ethanol (500 ml) was shaken under 50 psi of hydrogen overnight. The reaction mixture was filtered through a bed of celite, and the filter cake was washed with ethanol. The solvent was evaporated and the residue recrystallized twice from ethyl acetate to give 7.0 g (87%) of product, mp 92-94°C. Analysis: Calculated for C₂₁H₃₇NO₃S: 65.75%C 9.72%H 3.65%N Found: 65.72%C 9.82%H 3.63%N EXAMPLE 81 erythro-2-Amino-1-[3-(1-dodecyl)-5-isoxazolyl]-1,3-propanediol A solution of erythro-N-[1-[3-(1-dodecyl)-5-isoxazolyl]-1,3-dihydroxy-2-propyl]acetamide (4.0 g), degassed 2N sodium hydroxide solution (100 ml), and 95% ethanol (50 ml) was stirred at 60°C for 3 hrs. The reaction mixture was concentrated, the residue diluted with sodium bicarbonate solution, and extracted with 4:1 -chloroform-2-propanol. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was recrystallized from ethylacetate-hexane. The precipitate was flash chromatographed (silica, 90:1 -dichloromethane:methanol). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate-hexane to give 2.3 g (65%) of product, mp 88-90°C. Analysis: Calculated for C₁₈H₃₄N₂O₃: 66.22%C 10.50%H 8.58%N Found: 65.55%C 10.44%H 8.51%N EXAMPLE 82 3-(1-Decyl)-5-isoxazolemethanol To a solution of 1-nitroundecane (38.0 g) and O-trimethylsilylpropynol (24.1 g) in dry benzene (300 ml) was added dropwise a solution of freshly distilled phenylisocyanate (44.9 g) and triethylamine (22.4 g) in dry benzene (50 ml) at 40°C, with stirring. The reaction mixture was heated at 60°C for 3 hrs, cooled, and filtered. To the filtrate was added 1.0 M tetrabutylammonium fluoride (40 ml). After 30 mins, the solution was evaporated, and the residue was flash chromatographed (silica gel, 1% methanol-dichloromethane) to give 15.5 g (34%) of product, mp 55-56°C. Analysis: Calculated for C₁₄H₂₅NO₂: 70.25%C 10.53%H 5.85%N Found: 70.44%C 10.42%H 5.92%N EXAMPLE 83 3-(1-Decyl)-5-isoxazolecarboxaldehyde To a solution of oxalyl chloride (31.7 ml) in dry dichloromethane (100 ml) cooled to -60°C, was added a solution of dimethylsulfoxide (9.8 ml) in dichloromethane (30 ml) followed by a slurry of 3-(1-decyl)-5-isoxazolemethanol (13.8 g) in dry dichloromethane (100 ml). The reaction mixture was stirred at -60°C for 0.5 hr, quenched with triethylamine (40 ml), and allowed to warm to ambient temperature. The solution was poured into water (300 ml) and extracted with dichloromethane. The organic phases were washed with dilute citric acid, dried, and evaporated. The residue was flash chromatographed (silica, 50:1-dichloromethane:methanol). The appropriate fraction were collected and evaporated. The residue was recrystallized from ether-hexane to give 11.2 g (82%) of product, mp 46-48°C. Analysis: Calculated for C₁₄H₂₃NO₂: 70.85%C 9.77%H 5.90%N Found: 71.16%C 9.93%H 5.94%N EXAMPLE 84 Ethyl erythro-2-acetamido-3-(3-(1-decyl)-5-isoxazolyl)-3-hydroxypropionate To a mixture of 3-(decyl)-5-isoxazolecarboxaldehyde (10 g), and acetamidomalonic acid monoethylester (7.9 g) in dry tetrahydrofuran (100 ml), cooled to 0°C, was added triethylamine (4.5 g), under nitrogen. The solution was allowed to warm to room temperature and stirred for 16 hrs. The solution was evaporated, and the residue was recrystallized twice from ethyl acetate-hexane to give 10.3 g (64%) of product, mp 83-85°C. Analysis: Calculated for C₂₀H₃₄N₂O₅: 62.80%C 8.96%H 7.32%N Found: 62.87%C 9.30%H 7.32%N EXAMPLE 85 erythro-2-Amino-1-[3-(1-decyl)-5-isoxazolyl]-1,3-propanediol A solution of erythro-N-[1-[5-(decyl)-3-isoxazolyl]-1,3-dihydroxy-2-propyl]acetamide (9.30 g), degassed 2N sodium hydroxide solution (200 ml), and 95% ethanol (100 ml) was stirred at 80°C for 6 hrs. The reaction mixture was concentrated, the residue diluted with sodium bicarbonate solution, and extracted with 4:1-chloroform:2-propanol. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed (silica; 9:1 dichloromethane:methanol). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate-hexane to give 6.1 g (75%) of product, mp 88-90°C. Analysis: Calculated for C₁₆H₃₀N₂O₃: 64.40%C 10.13%H 9.39%N Found: 64.37%C 10.25%H 9.42%N EXAMPLE 86 5-(1-Undecynyl)-2-thiophenecarboxaldehyde A solution of 1-undecyne (62.7 g), 5-bromo-2-thiophenecarboxaldehyde (75.0 g), and triethylamine (119.2 g) in dry tetrahydrofuran (300 ml) was degassed and stirred at 0-5°C, under a nitrogen atmosphere. Two mole percent of bis(triphenylphosphine)palladium(II)chloride (5.51 g) followed by one mole percent of copper(I)iodide (0.75 g) was added and the mixture was degassed and stirred at room temperature overnight, under nitrogen. The precipitate was filtered and the filter cake was washed with ethyl acetate. The filtrate was evaporated and the residue purified by flash chromatography (silica; 5% ethyl acetate-hexane). The appropriate fractions were colllected and evaporated to give 88.1 g (85%) of product as an oil. The oil was dried at 50°C under high vacuum (approx. 0.01 mm mercury) for four hrs to provide the analytical sample. Analysis: Calculated for C₁₆H₂₂OS: 73.23%C 8.45%H Found: 73.15%C 8.50%H EXAMPLE 87 Ethyl erythro-2-acetamido-3-[5-(1-undecynyl)-2-thienyl]-3-hydroxypropionate A slurry of 5-undecynyl-2-thiophenecarboxaldehyde (86. 1 g), acetamidomalonic acid monoethyl ester (62.0 g), and dry tetrahydrofuran (300 ml) was degassed and cooled to 0°C. Triethylamine (34.8 g) was added, the solution were degassed, and the reaction mixture was stirred at room temperature for four days, under nitrogen. Acetamidomalonic acid monoethyl ester (62.0 g) and triethylamine (34.8 g) were added, and the reaction mixture was stirred at room temperature for an additional two days, under nitrogen. The reaction mixture was evaporated, and the residue was dried under vacuum. The residue was purified by flash chromatography (silica; 1:1-ethyl acetate-hexane). The appropriate fractions were collected and evaporated, and the residue was recrystallized from ethyl acetate to give 86.5 g (65%) of product, mp 80-82°C. Analysis: Calculated for C₂₂H₃₃NO₄S: 64.83%C 8.16%H 3.44%N Found: 64.65%C 8.07%H 3.45%N EXAMPLE 88 erythro-N-[1-[5-(1-Undecynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide A solution of ethyl erythro-2-acetamido-3-[5-(1-undecynyl)-2-thienyl]-3-hydroxypropionate (86.2 g) in dry tetrahydrofuran (200 ml) was stirred at 0°C, under nitrogen. Lithium borohydride (137.5 ml, 2.0 M in tetrahydrofuran) was added dropwise. The reaction mixture was allowed to warm to room temperature, and was stirred for four hrs, under nitrogen. The reaction mixture was cooled in an ice-bath. Methanol:water:acetic acid solution (50 ml:50 ml:10 ml) was added. The solution was neutralized with glacial acetic acid. The mixture was evaporated, and the residue was diluted with water (400 ml) and extracted with ethyl acetate. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica; 7% methanol:dichloromethane). The appropriate fractions were collected and evaporated. Recrystallization of the residue from ethyl acetate gave 61.2 g (79%) of product, mp 88-90°C. Analysis: Calculated for C₂₀H₃₁NO₃S: 65.72%C 8.55%H 3.83%N Found: 66.00%C 8.71%H 3.82%N EXAMPLE 89 (4-trans)-N-[2,2-Dimethyl-4-[5-(1-undecynyl)-2-thienyl]-1,3-dioxan-5-yl]acetamide To a solution of erythro-N-[1-[5-(1-undecynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (25 g) in dry acetone (400 ml) was added 2,2-dimethoxypropane (45.3 g) and a catalytic amount of para-toluenesulfonic acid. The solution was stirred at room temperature for 7 hrs and then evaporated. The residue was purified by column chromatography (silica gel, 4:1 chloroform:ether). The appropriate fractions were collected and concentrated. Recrystallization from ether-hexane gave 20.9 g (73.8%) of product, mp 88-89°C. Analysis: Calculated for C₂₃H₃₅NO₃S: 68.11%C 8.70%H 3.45%N Found: 68.26%C 8.83%H 3.39%N EXAMPLE 90 erythro-N-[1-[5-(1-Nonynyl)-2-thienyl]-1,3-dihydroxy-2-propyl]-1,1-dimethylethylcarbamate To a slurry of erythro-2-amino-1-[5-(1-nonynyl)-2-thienyl]-1,3-propanediol (2.8 g) in saturated sodium bicarbonate solution (50 ml) was added a solution of di-tert-butyl dicarbonate (2.24 g) in chloroform (50 ml), over two mins. The mixture was stirred at 60°C for 45 mins, the layers were separated, and the organic layer was dried and evaporated. The residue was purified by passage through a short pad of silica gel, and the filtrate was evaporated. The residue was crystallized from ether-hexane to give 2.9 g (77.6%) of product, mp 73-75°C. Analysis: Calculated for C₂₁H₃₃NO₄S: 63.77%C 8.41%H 3.54%N Found: 63.65%C 8.31%H 3.50%N EXAMPLE 91 erythro-2-Amino-1-[5-(1-nonyl)-2-thienyl]-1,3-propanediol acetate A solution of erythro-N-[1-[5-(1-nonyl)-2-thienyl]-1,3-dihydroxy-2-propyl]acetamide (7.30 g), 2N sodium hydroxide solution (100 ml) and 95% ethanol (75 ml) was stirred at 65°C overnight. The reaction mixture was concentrated, and the aqueous residue was neutralized with glacial acetic acid. The solution was diluted with water (200 ml) and extracted with 4:1-chloroform:isopropanol. The combined organic extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was purified by flash chromatography (silica; 90:9:1-dichloromethane:methanol:ammonium hydroxide). The appropriate fractions were collected and concentrated. The residue was dissolved in ethanol, and excess glacial acetic acid was added. Ether and hexane were added. The precipitate was recrystallized from ethyl acetate to give 4.1 g (53%) of product, mp 109-111°C. Analysis: Calculated for C₁₈H₃₃NO₄S: 60.13%C 9.25%H 3.90%N Found: 60.02%C 8.99%H 3.90%N EXAMPLE 92 erythro-2-Dimethylamino-1-[5-(6-phenyl-1-hexynyl)-2-thienyl]-1,3-propanediol To a mixture of erythro-2-amino-1-[5-(6-phenyl-1-hexynyl)-2-thienyl]-1,3-propanediol (4.0 g), 37% aqueous formaldehyde (9.1 ml), and acetonitrile (50 ml) was added sodium cyanoborohydride (2.29 g) in three portions, with stirring at room temperature. After stirring for 30 mins, glacial acetic acid (1 ml) was added dropwise, and stirring was continued for 30 mins. The mixture was neutralized with acetic acid and evaporated. 1N Sodium hydroxide (200 ml) was added to the residue, and the mixture was extracted with chloroform. The extracts were dried over anhydrous sodium sulfate, filtered, and the filtrate was evaporated. The residue was flash chromatographed on silica gel, using 10% methanol:dichloromethane as eluent. The appropriate fractions were collected and evaporated to give 1.3 g (30%) of product, as an oil. EXAMPLE 93 4-(1-Dodecenyl)-2-thiophenecarboxaldehyde A solution of 1-dodecyne (50.0 g), tributyltinhydride (109.4 g), and azobisisobutyronitrile (100 mg) was stirred at 95°C for 3 hrs. The reaction mixture was cooled to 50°C and evaporated. The resiude was filtered through a column of silica, using hexane as the eluent. The appropriate fractions were collected and evaporated. The residue was dried under vacuum to give 131.7 g (96.0%) of tri-n-butyl-1-dodecenylstannane. To a solution of 4-bromo-2-thiophenecarboxaldehyde (35.0), tetrakis(triphenylphosphine)palladium(0) (4.23 g), 2,6-di- t -butyl-4-methylphenol (a few milligrams) and dry toluene (150 ml) was added tri- n -butyl-1-dodecenylstannane (92.0 g), dropwise at room temperature, under nitrogen. The solution was heated under reflux for four hrs, with stirring. After cooling to room temperature, the solution was filtered through a bed of celite, and the filter cake was washed with ether. The filtrate was evaporated and the residue purified by flash chromatography (silica; 5% ethyl acetate-hexane). The appropriate fractions were collected and concentrated. The residue was distilled in a kugelrohr oven (170°C/0.3 mm mercury) to give 46.7 g (92%) of product, as an oil ( ca . 4:1 -trans:cis). Analysis: Calculated for C₁₇H₂₆OS: 73.33%C 9.41%H Found: 73.64%C 9.62%H EXAMPLE 94 Ethyl erythro-2-acetamido-3-[5-(1-dodecenyl)-2-thienyl]-3-hydroxypropionate A slurry of 5-dodecenyl-2-thiophenecarboxaldehyde (46.0 g, ca. 4:1-trans:cis), acetamidomalonic acid monoethyl ester (31.3 g), and dry tetrahydrofuran (300 ml) was degassed and cooled to 0°C. Triethylamine (17.6 g) was added, the solution was degassed, and the reaction mixture was stirred at room temperature for three days, under nitrogen. Acetamidomalonic acid monoethyl ester (46.0 g) and triethylamine (17.6 g) were added, and the reaction mixture was stirred at room temperature for an additional three days, under nitrogen. The reaction mixture was concentrated, and the residue was dried under vacuum. The residue was was purified by flash chromatography (silica; 2:3 ethyl acetate-hexane). The appropriate fractions were collected and concentrated. The residue was recrystallized from diethyl ether to give 36.7 g (53%) of product ( ca . 4:1-trans:cis), mp 66-68°C. Analysis: Calculated for C₂₃H₃₇NO₄S: 65.21%C 8.80%H 3.31%N Found: 65.36%C 8.71%H 3.32%N EXAMPLE 95 erythro-N-{1.3-Diacetyloxy-1-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]-2-propanyl}acetamide A diastereomeric mixture of N-{1,3-dihydroxy-1-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]-2-propanyl}acetamide (18.4 g, 6:1-erythro:threo), acetic anhydride (31.9 g), triethylamine (47.5 g), and 4-dimethylaminopyridine (0.64 g) in tetrahydrofuran (200 ml) was stirred at room temperature overnight. The reaction mixture was concentrated, methanol was added, and the mixture was warmed at 50°C for 20 mins. The mixture was evaporated, and the residue azeotroped with toluene. A 7.5% sodium bicarbonate solution was added until pH 8.5, and the mixture was extracted into chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue and one (8.0 g) from a similar reaction (18.8 mmol) were combined and purified by flash chromatography, eluting with 1:1-yield hexane:ethyl acetate. The appropriate fractions were collected and concentrated to yield 5.06 g (16.3% yield) of product, mp 104-106°C. Analysis: Calculated for C₂₅H₂₈N₂O₅: 68.79%C 6.47%H 6.42%N Found: 68.69%C 6.47%H 6.36%N EXAMPLE 96 erythro-2-Amino-1-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]-1,3-propanediol hemihydrate erythro-N-{1,3-Dihydroxy-1-[6-(5-phenyl-1-pentynyl)-2-pyridinyl]-2-propanyl}acetamide (4.4 g), 2N sodium hydroxide solution (100 ml) and ethanol (50 ml) were heated at 60°C for 13 hrs, under nitrogen. The reaction mixture was cooled, extracted with chloroform, and the extract was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed twice on silica gel eluting with 950:50:3 to 920:80:5 chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and concentrated. The residue was dissolved in ethyl acetate, and the solution was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated to give 1.13 g (36.5%) of product, as an oil (dried 60°C under vacuum). Analysis: Calculated for C₁₉H₂₂N₂O₂0.5H₂O: 71.44%C 7.26%H 8.77%N Found: 71.87%C 7.11%H 8.67%N EXAMPLE 97 erythro-N-[1,3-Dihydroxy-1-(6-undecyl-2-pyridinyl)-2-propanyl]acetamide A mixture of erythro-N-{1,3-Dihydroxy-1-[6-(1-undecynyl)-2-pyridinyl]-2-propanyl}acetamide (5.4 g) in ethanol (125 ml), and 5% palladium-on-carbon (0.20 g) was hydrogenated on a Parr hydrogenator at 40 psi of hydrogen. After 2.5 hrs, the catalyst was filtered, and the filtrate was concentrated. Recrystallization of the residue from ethyl acetate gave 4.9 g (88.7%) of product, mp 97-98.5°C. Analysis: Calculated for C₂₁H₃₆N₂O₃: 69.19%C 9.95%H 7.68%N Found : 69.19%C 9.91%H 7.64%N EXAMPLE 98 erythro-2-Amino-1-(6-undecyl-2-pyridinyl)-1,3-propanediol erythro-N-[1,3-Dihydroxy-1-(6-undecyl-2-pyridinyl)-2-propanyl]acetamide (3.72 g), hydrazine hydrate (32 ml), and ethanol (25 ml) were refluxed for 24 hrs, under nitrogen. The reaction mixture was cooled, water was added, and the mixture was extracted with chloroform. The extract was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was evaporated. The residue was chromatographed on silica gel, eluting with 950:50:3 chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in chloroform, the solution was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated to give 1.45 g (44%) of product, mp 56-59°C (dried at 55°C under vacuum). Analysis: Calculated for C₁₉H₃₄N₂O₂: 70.76%C 10.63%H 8.69%N Found: 70.20%C 10.71%H 8.48%N EXAMPLE 99 erythro-2-Amino-1-[6-(1-undecynyl)-2-pyridinyl]-1,3-propanediol hemihydrate erythro-N-{1,3-Dihydroxy-1-[6-(1-undecynyl)-2-pyridinyl]-2-propanyl}acetamide (5.4 g), 2N sodium hydroxide (53 ml), and ethanol (35 ml) were heated at 60°C for 19 hrs, under nitrogen. The reaction mixture was cooled, extracted with chloroform, and the extract was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was chromatographed twice on silica gel, eluting with 950:50:3 to 930:70:5 chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and concentrated to give 3.04 g (63.6% yield) of product, as an oil dried at 60°C under vacuum. Analysis: Calculated for C₁₉H₃₀N₂O₂0.5H₂O: 69.69%C 9.54%H 8.55%N Found: 69.93%C 9.37%H 8.46%N EXAMPLE 100 erythro-N-{1,3-Diacetyloxy-1-[6-(1-undecynyl)-2-pyridinyl]-2-propanyl}acetamide A diastereomeric mixture of N-{1,3-dihydroxy-1-[6-(1-undecynyl)-2-pyridinyl]-2-propanyl}acetamide (12.0 g, 4:1 erythro:threo), acetic anhydride (20.4 g), triethylamine (30.4 g), and 4-dimethylaminopyridine (0.41 g) in tetrahydrofuran (125 ml) was stirred at room temperature overnight. The reaction mixture was evaporated, methanol was added, and the solution was warmed at 50°C for 20 min and evaporated. A 7.5% sodium bicarbonate solution was added until pH 8.5, and the mixture was extracted into chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was purified by flash chromatography, eluting with 1:1-hexane:ethyl acetate. The appropriate fractions were combined and concentrated to yield 3.5 g (24%) of product, mp 69-71°C. Analysis: Calculated for C₂₅H₃₆N₂O₅: 67.54%C 8.16%H 6.30%N Found: 67.65%C 8.23%H 6.18%N EXAMPLE 101 3-(1-Undecynyl)benzaldehyde A mixture of 3-bromobenzaldehyde (51.8 g), 1-undecyne (48.6 g), bis(triphenylphosphine)palladium(II)chloride (3.37 g), copper iodide (457 mg), and triethylamine (196 ml) in dry tetrahydrofuran (300 ml) was stirred for 4 hrs at 55°C. The reaction mixture was filtered, the filtrate was diluted with ethyl acetate, and the solution was washed with water and brine. The organic phase was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated in vacuo. The residue was chromatographed on 300 g of silica gel (1:4-ethyl acetate:hexane). The appropriate fractions were collected and evaporated. Distillation of a 40-g sample of the residue (81.3 g) gave 9.5 g (13%) of the product, bp 172-174°C (0.5 mm mercury). Analysis: Calculated for C₁₈H₂₄O: 84.32%C 9.44%H Found : 84.76%C 9.57%H EXAMPLE 102 erythro-2-Amino-1-(3-undecynylphenyl)-1,3-propanediol acetate A solution of erythro-N-{1,3-diacetyloxy-1-[3-(undecynylphenyl-2-propanyl} acetamide (2.76 g) and aqueous 2 N sodium hydroxide solution (62 ml) in ethanol (20 ml) was warmed to 60°C for 16 hr. The reaction mixture was allowed to cool to room temperature and extracted with chloroform. The extract was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated in vacuo. The residue was chromatographed on silica gel (eluted with 900:100:5 chloroform:methanol:ammonium hydroxide). The residue was rechromatographed (eluted with 9:1-chloroform:methanol) to afford 1.35 g (71%) of the free base. To a solution of free base (1.05 g) in dichloromethane (10 ml) was added glacial acetic acid (2 ml) followed by hexane (50 ml). The mixture was concentrated in vacuo and the solid was recrystallized from ethyl acetate to afford 860 mg (69%) of product, mp 110-112°C. Analysis: Calculated for C₂₂H₃₅NO₄: 69.99%C 9.34%H 3.71%N Found : 70.36%C 9.32%H 3.69%N EXAMPLE 103 erythro-2-Amino-1-[3-(1-dodecynyl)phenyl]-1,3-propanediol acetate erythro-N-{1,3-Dihydroxy-1-[3-(1-dodecynyl)-phenyl]-2-propanyl}acetamide (2.7 g), 2N sodium hydroxide solution (36 ml) and ethanol (20 ml) were heated at 60°C for 19 hrs, under nitrogen. The reaction mixture was cooled, and extracted with chloroform. The extract was washed with half-saturated sodium chloride solution, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was chromatographed on silica gel, eluting with 950:50:3 chloroform:methanol:2N ammonium hydroxide. The appropriate fractions were collected and evaporated. The residue was dissolved in dichloromethane and treated with glacial acetic (0.27 ml). The mixture was concentrated in vacuo and the solid was recrystallized from ethyl acetate to give 1.72 g (61%) of product, mp 104-105.5°C. Analysis: Calculated for C₂₃H₃₇NO₄: 70.55%C 9.52%H 3.58%N Found : 70.62%C 9.46%H 3.54%N

Claims: Claims for the following Contracting States : AT, BE, CH, DE, DK, FR, GB, IT, LI, LU, NL, SE A compound of the formula I RCH(OR¹)CH(NR²R³)R⁴ I wherein R is wherein R⁵ is CH₃(CH₂) m C Ξ C, CH₃(CH₂) m CH=CH, CH₃(CH₂) m CH₂CH₂, wherein m is 3 to 15, n is 0 to 12, and X is hydrogen, loweralkyl, loweralkoxy, halogen, or trifluoromethyl, and Z is S, O, or C=O; and A is S or O; R¹ is hydrogen or wherein R⁶ is hydrogen, loweralkyl, loweralkoxy, or R² is hydrogen or loweralkyl; R³ is hydrogen, loweralkyl or wherein R⁶ is as above; R⁴ is wherein R⁷ is hydrogen, loweralkyl, or CH₂OR⁸ wherein R⁸ is hydrogen or wherein R⁶ is as above; R¹ and R⁸ taken together with the oxygen to which they are attached form a group of the formula wherein R⁹ and R¹⁰ are independently hydrogen or loweralkyl; the optical isomers thereof, or the pharmaceutically acceptable salts thereof, the term lower referring to a group containing up to and including 8 carbon atoms A compound as defined in claim 1, wherein R is wherein R⁵ is as defined, X is hydrogen and Z is O. A compound as defined in claim 2, wherein R is wherein X is hydrogen and R⁵ is CH₃(CH₂) m C≡C or CH₃(CH₂) m CH₂CH₂ or wherein m and n are as defined, R¹ is hydrogen or where R⁶ is loweralkyl, R² is hydrogen, R³ is hydrogen or where R⁶ is as above, and R⁴ is as defined. A compound as defined in claim 3, where R is where R¹, R² and R³ are hydrogen and R⁵ is CH₃(CH₂) m CH₂CH₂ or where W and X are hydrogen and m and n are as defined. The compound as defined in claim 1 which is erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane, or a pharmaceutically acceptable salt thereof. The compound as defined in claim 1, which is ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxy propionate, or a pharmaceutically acceptable salt thereof. The compound as defined in claim 1, which is erythro-2-amino-1-(6-dodecyl-2-pyridinyl)-1,3-propanediol or a pharmaceutically acceptable salt thereof. The compound as defined in claim 1 which is erythro-N-{1-6-(1-dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide or a pharmaceutically acceptable salt thereof. The compound as defined in claim 1 which is erythro-2-amino-1-[5-(1-dodecynyl)-2-thienyl]-1,3-propanediol, or a pharmaceuticaly acceptable salt thereof. The compound as defined in claim 1 which is erythro-N-{1-[6-(1-decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl} acetamide or a pharmaceutically acceptable salt thereof. A pharmaceutical composition which comprises as the active ingredient a compound as defined in claim 1 and a suitable adjuvant. Use of a compound as defined in claim 1 for the preparation of a medicament having memory dysfunction relieving, anti inflammatory, cell proliferation reducing antibacterial and/or antifungal activity. A compound of the formula R'CHO wherein R' is wherein R⁵ is CH₃(CH₂) m C≡C, CH₃(CH₂) m CH=CH, CH₃(CH₂) m CH₂CH₂ or where m is 3 to 15, n is 0 to 12, W and X are independently hydrogen, loweralkyl, loweralkoxy, halogen or trifluoromethyl and Z is O. the term "lower referring to a group containing up to 8 carbon atoms A process for the preparation of a compound as defined in claim 1, which comprises a) reacting a compound of the formula 4a wherein R'' is wherein X is as defined and Y is halogen, with an alkyne of the formula CH₃(CH₂) m C≡CH or wherein W, m an n are as defined, to form a compound of the formula I wherein R is as defined where R⁵ is CH₃(CH₂) m C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷ where R⁷ is loweralkyl, or b) reacting a compound of the formula 10a RCHO wherein R is as defined, where R⁵ is CH₃(CH₂) m C≡C or with a compound of the formula 3 wherein R¹¹ and R¹² are loweralkyl, to form a compound of the formula I as obtained in step a) above, c) optionally reducing a compound of the formula I as obtained in step a) or b) above, by means of an alkali borohydride to form a compound of the formula I wherein R is as defined, wherein R⁵ is CH₃(CH₂) m C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, d) optionally hydrogenating a compound of the formula I as obtained in step a), b) or c) to form a compound of the formula I, where R is as defined where R⁵ is CH₃(CH₂) m CH₂CH₂ or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷, where R⁷ is loweralkyl, or R⁴ is CH₂OH, e) optionally reducing a compound of the formula I, wherein R is as defined where R⁵ is CH₃(CH₂) m CH₂CH₂ or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷ where R⁷ is loweralkyl, by means of an alkali borohydride to form a compound of the formula I, where R, R⁵, R¹, R³ and R² are as hereinbefore described and R⁴ is CH₂OH, f) optionally hydrogenating a compound of the formula I, wherein R is as defined, where R⁵ is CH₃(CH₂) n C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, to form a compound of the formula I wherein R, R¹, R², R³ and R⁴ are as hereinbefore described and R⁵ is CH₃(CH₂) n CH=CH or g) optionally hydrolyzing a compound of the formula I, wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl, and R⁴ is CH₂OH, to form a compound of the formula I wherein R, R⁵, R¹, R² and R⁴ are as hereinbefore described and R³ is hydrogen, h) optionally reacting a compound of the formula I, wherein R is as defined, R¹, R² and R³ are hydrogen and R⁴ is CH₂OH, with a loweraldehyd in the presence of a reducing agent to form a compound of the formula I, wherein R and R⁵ are as defined, R¹ is hydrogen, R⁴ is CH₂OH and R² and R³ are loweralkyl, i) optionally reacting a compound of the formula I, wherein R is as defined, R¹, R² and R³ are hydrogen and R⁴ is -CH₂OH, with N-benzyloxycarbonyloxy-succinimide of the formula 20 to form a compound of the formula I, where R and R⁵ are as defined R¹ and R³ are benzyloxycarbonyl and R⁴ is CH₂OR⁸ where R⁸ is benzyloxycarbonyl, j) optionally reacting a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, k) optionally acylating a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R₄ is CH₂OH, to form a compound of the formula I, wherein R, R⁵, R¹, R² and R³ are as hereinbefore described and R⁴ is CH₂OCOR⁶ where R⁶ is loweralkyl, l) optionally reacting a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH with 2,2-dimethoxy-propane, to form a compound of the formula I, wherein R, R² and R³ are as defined, R⁴ is CH₂OR⁸ and R¹ and R⁸ taken together form a group of the formula Claims for the following Contracting States : ES, GR A process for the preparation of a compound of the formula I RCH(OR¹)CH(NR²R³)R⁴ I wherein R is wherein R⁵ is CH₃(CH₂) m C Ξ C, CH₃(CH₂) m CH=CH, CH₃(CH₂) m CH₂CH₂, wherein m is 3 to 15, n is 0 to 12, and X is hydrogen, loweralkyl, loweralkoxy, halogen, or trifluoromethyl, and Z is S, O, or C=O; and A is S or O; R¹ is hydrogen or wherein R⁶ is hydrogen, loweralkyl, loweralkoxy, or R² is hydrogen or loweralkyl; R³ is hydrogen, loweralkyl or wherein R⁶ is as above; R⁴ is wherein R⁷ is hydrogen, loweralkyl, or CH₂OR⁸ wherein R⁸ is hydrogen or wherein R⁶ is as above; R¹ and R⁸ taken together with the oxygen to which they are attached form a group of the formula wherein R⁹ and R¹⁰ are independently hydrogen or loweralkyl; the optical isomers thereof, or the pharmaceutically acceptable salts thereof, the term lower referring to a group containing up to and including 8 carbon atoms, which comprises a) reacting a compound of the formula 4a wherein R'' is wherein X is as defined and Y is halogen, with an alkyne of the formula CH₃(CH₂) m C≡CH or wherein W, m an n are as defined, to form a compound of the formula I wherein R is as defined where R⁵ is CH₃(CH₂) m C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷ where R⁷ is loweralkyl, or b) reacting a compound of the formula 10a RCHO wherein R is as defined, where R⁵ is CH₃(CH₂) m C≡C or with a compound of the formula 3 wherein R¹¹ and R¹² are loweralkyl, to form a compound of the formula I as obtained in step a) above, c) optionally reducing a compound of the formula I as obtained in step a) or b) above, by means of an alkali borohydride to form a compound of the formula I wherein R is as defined, wherein R⁵ is CH₃(CH₂) m C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, d) optionally hydrogenating a compound of the formula I as obtained in step a), b) or c) to form a compound of the formula I, where R is as defined where R⁵ is CH₃(CH₂) m CH₂CH₂ or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷, where R⁷ is loweralkyl or R⁴ is CH₂OH, e) optionally reducing a compound of the formula I, wherein R is as defined where R⁵ is CH₃(CH₂) m CH₂CH₂ or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CO₂R⁷ where R⁷ is loweralkyl, by means of an alkali borohydride to form a compound of the formula I, where R, R⁵, R¹, R² and R³ are as hereinbefore described and R⁴ is CH₂OH, f) optionally hydrogenating a compound of the formula I, wherein R is as defined, where R⁵ is CH₃(CH₂) n C≡C or R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, to form a compound of the formula I wherein R, R¹, R², R³ and R⁴ are as hereinbefore described and R⁵ is CH₃(CH₂) n CH = CH or g) optionally hydrolyzing a compound of the formula I, wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl, and R⁴ is CH₂OH, to form a compound of the formula I wherein R, R⁵, R¹, R² and R⁴ are as hereinbefore described and R³ is hydrogen, h) optionally reacting a compound of the formula I, wherein R is as defined, R¹, R² and R³ are hydrogen and R⁴ is CH₂OH, with a loweraldehyd in the presence of a reducing agent to form a compound of the formula I, wherein R and R⁵ are as defined, R¹ is hydrogen, R⁴ is CH₂OH and R² and R³ are loweralkyl, i) optionally reacting a compound of the formula I, wherein R is as defined, R¹, R² and R³ are hydrogen and R⁴ is -CH₂OH, with N-benzyloxycarbonyloxy-succinimide of the formula 20 to form a compound of the formula I, where R and R⁵ are as defined, R¹ and R³ are benzyloxycarbonyl and R⁴ is CH₂OR⁸ where R⁸ is benzyloxycarbonyl, j) optionally reacting a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, k) optionally acylating a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH, to form a compound of the formula I, wherein R, R⁵, R¹, R² and R³ are as hereinbefore described and R⁴ is CH₂OCOR⁶ where R⁶ is loweralkyl, l) optionally reacting a compound of the formula I wherein R is as defined, R¹ and R² are hydrogen, R³ is COR⁶ where R⁶ is loweralkyl and R⁴ is CH₂OH with 2,2-dimethoxy-propane, to form a compound of the formula I, wherein R, R² and R³ are as defined, R⁴ is CH₂OR⁸ and R¹ and R⁸ taken together form a group of the formula A process as defined in claim 1, wherein R is wherein R⁵ is as defined, X is hydrogen and Z is O. A process as defined in claim 2, wherein R is wherein X is hydrogen and R⁵ is CH₃(CH₂) m C≡C, or CH₃(CH₂) m CH₂CH₂ or wherein m and n are as defined, R¹ is hydrogen or where R⁶ is loweralkyl, R² is hydrogen R³ is hydrogen or where R⁶ is as above, and R⁴ is as defined. A process as defined in claim 3, where R is where R¹, R² and R³ are hydrogen and R⁵ is CH₃(CH₂) m CH₂CH₂ or where W and X are hydrogen and m and n are as defined. The process as defined in claim 1 wherein erythro-2-amino-1-(6-decyl-2-pyridinyl)-1,3-dihydroxypropane, or a pharmaceutically acceptable salt thereof is prepared. The process as defined in claim 1, wherein ethyl erythro-2-acetamido-3-[6-(1-dodecynyl)-2-pyridinyl]-3-hydroxy propionate, or a pharmaceutically acceptable salt thereof is prepared. The process as defined in claim 1, wherein erythro-2-amino-1-(6-dodecyl-2-pyridinyl)-1,3-propanediol or a pharmaceutically acceptable salt thereof is prepared. The process as defined in claim 1 , wherein erythro-N-{1-[6-(1-dodecynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide or a pharmaceutically acceptable salt thereof is prepared. The process as defined in claim 1, wherein erythro-2-amino-1-[5-(1-dodecynyl)-2-thienyl]-1,3-propanediol, or a pharmaceuticaly acceptable salt thereof is prepared. The process as defined in claim 1, wherein erythro-N-{1-[6-(1-decynyl)-2-pyridinyl]-1,3-dihydroxy-2-propanyl}acetamide or a pharmaceutically acceptable salt thereof is prepared. Use of a compound as defined in claim 1 for the preparation of a medicament having memory dysfunction relieving, anti inflammatory, cell proliferation reducing antibacterial and/or antifungal activity. A compound of the formula 1a R'CHO wherein R' is wherein R⁵ is CH₃(CH₂) m C≡C, CH₃(CH₂) m CH=CH, CH₃(CH₂) m CH₂CH₂ or where m is 3 to 15, n is 0 to 12, W and X are independently hydrogen, loweralkyl, loweralkoxy, halogen or trifluoromethyl and Z is O, the term lower referring to a group containing upto and including 8 carbon atoms

Inventors: FREED BRIAN SCOTT, HAMER RUSSELL RICHARD LEE, RAUCKMAN BARBARA SEAVEY, TEGELER JOHN JOSEPH, FREED, BRIAN SCOTT, HAMER, RUSSELL RICHARD LEE, RAUCKMAN, BARBARA SEAVEY, TEGELER, JOHN JOSEPH
Applicants: HOECHST ROUSSEL PHARMA, HOECHST-ROUSSEL PHARMACEUTICALS INCORPORATED
Application year: 1991
Main classification: C07D213
IPC codes: C07C231, C07D263, C07D307, C07C47, A61K31, A61P25, C07C45, C07C233, C07D333, A61P43, C07D207, C07C215, C07D213, C07D409, C07D277, C07D275, C07C219, A61P35, A61P29, A61P31, C07C229, C07D405, C07D261