SUBSTITUTED 3-AMINO CHROMANS

Abstract: The present invention is directed to novel chromane derivatives substituted in the 3-position by a substituted amino moiety and substituted on the aromatic ring with one or two substituents. The novel chromane derivatives have useful CNS properties.

Description: SϋBSTITUTED 3-AMINO CHROMANS Field of the Invention The present invention is related to novel substituted 3-amino chromans. Background of the Invention Evidence from depressed patients indicates the neurotransmission in the central nervous system (CNS) may be disturbed. These disturb¬ ances involve the neurotransmitters noradrenaline (NA) and 5-hydroxy- tryptamine (5-HT) . The drugs most frequently used in the treatment of depression are considered to act by improving the neurotransmis¬ sion of either or both of these physiological agents. The mechanism of action for conventional drugs used to treat mental depression is generally believed to be indirect. It is thought the drugs block the reuptake of the neurotransmitters released from nerve terminals in the CNS, NA and/or 5-HT, which increases the concentration of these transmitters in the synaptic cleft and restores an adequate neuro¬ transmission. For example, the clinically documented antidepression drug, zimelidine (dimethyl-amino-l-(4-bromophenyl)-l-(3-pyridyl)prop- ene) acts as such a reuptake inhibitor with high selectivity for 5-HT neurons. Available data suggests enhancement of 5-HT neurotransmission will primarily improve depressed mood and anxiety, whereas enhance¬ ment of noradrenaline neurotransmission will improve the retardation symptoms occurring in depressed patients. In recent years many efforts have been made to develop new drugs with high selectivity for the improvement of the 5-HT neurotransmission in the CNS. A fundamentally different way to improve the neurotransmission in the central 5-HT neurons would be to use a 5-HT receptor agonist acting directly upon the 5-HT receptors, and particularly the 5-HT-*^ receptor. In order to minimize undesired side effects, a high selec¬ tivity for this kind of receptor would be necessary. Clinically, 5-HT-j^ agonists have also demonstrated anxiolytic properties. The drug, Buspirone, is the only currently available marketed 5-HT-j^ agonist having anxiolytic activity. This compound antagonizes dopamine receptors at the same dose it stimulates 5-HT I A receptors. These dopamine antagonist properties reduce the clinical utility of these compounds however because long term treatment with dopamine antagonists can produce tardive dyskinesias. The search for new CNS active compounds is focused on finding compounds with selective 5-HT- j ^ receptor agonist effects without detrimentally influencing central dopamine receptors. In recent years a large body of pharmacological, biochemical and electrøphysical evidence has provided considerable support in favor of the existence of a specific population of central autoregulatory dopamine receptors located in the dopaminergic neuron itself and belonging to the D receptor subclass of dopamine receptors. These receptors are part of a homeostatic mechanism that modulates nerve impulse flow and transmitter synthesis and regulates the amount of dopamine released from the nerve endings. Drugs, acting on central dopamine transmission are clinically effective in treating a variety of central nervous system disorders such as parkinsonism and schizophrenia. In parkinsonism, for exam- pie, the nigro-neostriatal hypofmction can be restored by an increase in postsynaptic dopamine receptor stimulation. In schizo¬ phrenia, the condition can be normalized by achieving a decrease in postsynaptic dopamine receptor stimulation. Classical antipsychotic agents directly block the postsynaptic dopamine receptor. The same effect can be achieved by inhibition of intraneuronal presynaptic events essential for the maintenance of adequate neurotransmission, transport mechanism and transmitter synthesis. Direct dopamine receptor agonists, like apomorphine, are able to activate the dopamine autoreceptors as well as the postsynaptic dopa- mine receptors. The effects of autoreceptor stimulation appear to predominate when apomorphine is administered at low doses, whereas at higher doses the attenuation of dopamine transmission is outweighed by the enhancement of postsynaptic receptor stimulation. The anti¬ psychotic and antidyskinetic effects in man of low doses of apomorph- ine are likely due to the autoreceptor-stimulator properties of this dopamine receptor agonist. This body of knowledge indicates dopamine receptor stimulants with a high selectivity for central nervous dop¬ amine autoreceptors would be valuable in treating psychiatric dis¬ orders. Information Disclosure Statement Ciba-Geigy patent application number EP 222 996 and Astra PCT/ SE87/00607 disclose 3-amino substituted chromanes having pharmaceuti¬ cal activity. Astra, PCT application W088/04654, discloses 5-hydroxy, 3-amine chromans which do not include cycloalkyl group substitution of the amine group or halogen substitution at the 8 position. Sarda, et al. , CA 85-153, 938 (1976); CA 86-5270y (1977); CA 82- 31208w (1975) and CA, 92-52486g (1980) discloses various halogen substituted chro an structures although not at the 8 position. Also, described are various hydroxy substituted chromans. Summary of the Invention This invention is to novel chroman compounds of Formula I (see Formula Chart) wherein R_ is H, alkyl C*ι_3 straight or branched, cyclopropyl ethyl, or cyclobutylmethyl; R is alkylCι.3, -CH2- cycloalkylC3-Cg, -CH2CH2Z(C__2) m C__3 or -(CH2)qR4 wherein R4 is phenyl; phenyl substituted with one or two substituent groups selected from chlorine, fluorine, bromine, alkylC;ι_3 and alkoxyC-i .3; 2-thiophene; or 3-thiophene; m is zero to 3; q is 1 to 3; and Z is oxygen or sulfur; R 3 is H, SalkylC-^, -S(0)alk lC 1 . 3 , -SHD^alk lC-^, alkoxyC-^.g, alkenyloxyC .g, -OCH2-cycloal lC3_g or OH, with the proviso that when R3 is OH or alkox C- j _.g, either ^ is cyclopropyl¬ methyl or cyclobutylmethyl or R2 is cycloalkylC3_ -CH2-; X is chlorine, fluorine, bromine, CF3, -NR5R6, -NR 7 C(-0)R 8 , -NR 9 C(-0)R 1 o > or -NR 11 C(-0)NR 12 R 13 wherein R , *._ , R7, R 9 , R 11( R 12 and R 13 are H or l lCι_5 or - 5 6 taken together form a monocyclic heterocyclic selected from pyrrolidino, piperidino, N-methylpiperazino, or morpholino; Rg is H or alkylCι_ 5 ; and R 10 is or -(CH2 n - phenyl wherein n is zero to two; and pharmaceutically acceptable salts thereof. Preferably, when X is F, Cl, Br or H2 » x is at the number eight carbon position. The compounds of this invention possess selective pharmacologi¬ cal properties and are useful in treating central nervous system dis- orders including depression symptoms, anxiety symptoms, panic attacks, obsessive-compulsive disturbances, senile dementia, emo¬ tional disturbances related to dementia disorders, and disturbances of sexual functions. The compounds of this invention are also useful to alleviate aggressive behavior, confusional delirious states and impotence. According to a preferred embodiment, the invention is related to compounds of Formula I where R2 is -CH2-cycloalkyl (C_ .Q) . A more preferred embodiment are compounds of Formula I where R^ is alkyl(C*^_ 3) . 2 is cyclopropylmethyl, and X-^ is halogen. An object of the invention is to provide compounds for therapeu¬ tic use, especially compounds having a therapeutic activity in the central nervous system. Another object is to provide compounds having an effect on the 5-HT- j ^ receptor in mammals including man. A further object of this invention is to provide compounds having an effect on the subclass of dopamine receptors known as the D2 recep¬ tor. Detailed Description of the Invention The compounds of this invention are identified in two ways: by the descriptive name and reference to labelled structures contained in Formula Charts. As used herein the parenthetical term (C-^-Cn is inclusive such th-tt. a compound of (C ] ._g) would include compounds of one to 8 carbons and their isomeric forms. The various carbon moieties are defined as follows: Alkyl refers to an aliphatic hydrocarbon chain and includes branched or unbranched- forms such as methyl, ethyl, n-propyl, isopxσpyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, neo-pentyl, n-hexyl, isohexyl, n-heptyl, isoheptyl, and n- octyl. Alkoxy refers to an alkyl which is attached to the remainder of the- molecule by oxygen and includes branched or unbranched forms such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, t-butoxy, n-pentoxy, isopentoxy, neo-pentoxy, n-hexoxy, isohexøxy, n-hept y, isoheptoxy, and n-octoxy. Alkenyloxy refers to an aliphatic unsaturated hydrocarbons having a double bond and which is attached to the remainder of the molecule by oxygen and includes both branched and unbranched forms such as 1-propenyloxy, 2- propenyloxy, 1-butenyloxy, 2-butenyloxy, 3-butenylox , 2-methyl-1- butextyloxy, 1-pentenyloxy, 2-pentenyloxy, 3-pentenyloxy, 4- pentenyloxy, l-methyl-4-pentenyloxy, 3-methyl-1-pentenyloxy, 3- methyl-2-pentenyloxy r 1-hexenyloxy, 2-hexenyloxy, 3-hexenyloxy, 4- hexenyloxy, l-methyl-4-hexen loxy, 3-methyl-1-hexenyloxy, 3-methyl-2- hexenyloxy, 1-heptenyloxy, 2-heptenyloxy, 3-heptenyloxy, 4- heptenyloxy, l-methyl-4-heptenyloxy, 3-methyl-1-he tenyloxy, 3- methyl-2-heptenyloxy, 1-octenyloxy, 2-octenyloxy, or 3-octenyloxy. Cycloalkyl refers to a saturated cyclic hydrocarbon such as cyclopropyl, cycl-butyl, cyclopentyl, cyclohexyl, cycloheptyl, or cyclooctyl. The group SalkylC*L-C3 is representative of methylthio, ethylthio and propylthio substituent groups. It will be apparent to those skilled in the art that compounds of this invention may contain chiral centers. The compounds of Form¬ ula I contain as mmetric carbon atoms in the aliphatic ring moiety, including the ring carbon atoms adjacent to the nitrogen atom. The therapeutic properties of the compounds may to a greater or lesser degree depend on the stereochemistry of a particular compound. The scope of this invention includes all enantiomeric or diastereomeric forms of Formula I compounds either in pure form or as mixtures of enantiomers or diastereomers. Pure enantiomers as well as enantio¬ meric or diastereomeric mixtures are within the scope of the inven¬ tion. The X substituent of Formula I is shown between carbon atoms 7 and 8 indicating it can be substituted at either of these positions unless otherwise indicated. Preferably, X is positioned at the 8 carbon atom. The R3 substituent of Formula I is shown between carbon atoms 6 and 7 which indicates it can be present at any of carbon atoms 5, 6 or 7. The preferred substituted carbon atom is number 6 and, of course, number 7 is not available when "X" is substituted at this position. Both organic and inorganic acids can be employed to form non- toxic pharmaceutically acceptable acid addition salts of the com¬ pounds of this invention. Illustrative acids are sulfuric, nitric, phosphoric, hydrochloric, citric, acetic, lactic, tartaric, pamoic, ethanedisulfonic, sulfamic, succinic, cyclohexylsulfamic, fumaric, maleic, and benzoic acid. These salts are readily prepared by methods known in the art. A pure enantiomer of a compound of Formula I may be prepared by converting the secondary amine of an appropriate final product of Formula I or an intermediate thereto as described in Chart I or as set forth in the Formula Chart into the (-)-O-methylmandelic acid amide followed by chromatographic separation of the two diastereomers and cleavage by subsequent reaction with potassium tert-butoxide in tetrahydrofuran with traces of water and methyl lithium. In the case of an incomplete reaction, the intermediate N-formyl derivative can be cleaved by the addition of methyl lithium to an ether solution of the formancide and subsequently quench with water and ether extraction to give the secondary amine. The secondary amine can be converted into the tertiary amine using methods already described. In clinical practice the compounds of the present invention will normally be administered orally, rectally, or by injection, in the form of pharmaceutical preparations comprising the active ingredient either as a free base or as a pharmaceutically acceptable non-toxic, acid addition salt, such as the hydrochloride, lactate, acetate, sulfaπate salt, in association with a pharmaceutically acceptable carrier. The use and administration to a patient to be treated in the clinic would be readily apparent to a person of ordinary skill in the art. In therapeutic treatment the suitable daily doses of the com¬ pounds of the invention are 1-2000 g for oral application, prefer¬ entially 50-500 mg, and 0.1-100 mg for parenteral application, pref- erentially 0.5-50 mg. The daily dosage will preferably be administered in divided dosages one to 4 times daily and the dosage amounts are based on an individual having a weight of about 70 kg. The compounds of this invention where R2 is cycloalkylmethyl also have high .oral potency and a long duration of action. Both these features are beneficial to effective clinical treatment. The utility of the compounds of this invention to treat central nervous system disorders is shown in behavioral and biochemical activity in reserpine-pretreated rats. Depletion of CNS onoamine stores with reserpine brings about a "neuroleptic syndrome" characterized by hypomotility, catalepsy, muscle rigidity, hunch-backed posture as well as a number of other central and peripheral signs of monoamine depletion. The whole or parts of this syndrome can be reversed by the administration of drugs that stimulate DA or 5-HT receptors directly or indirectly. Stimulation of the DA receptors, with apomorphine for example, gives rise to both locomotion and stereotyped behavior such as sniffing, gnawing and jxtaping. On the other hand, stimulation of the 5-HT receptors, with 5-hydroxytryptophan (5-HTP) combined with MAO- irihibitors for example, gives rise to a very different behavior. The animals lie flat on the cage floor exhibiting forward movements with extended forepaws padding, "piano-playing," and abducted hindlegs, occasionally with some tremor in the forebody and with Staubtail, stiff tail erection. The compounds under evaluation are tested biochemically for central DA- and 5-HT receptor (pre- and/or postsynaptic) stimulating activity. The concept of this biochemical screening method is that a DA- or 5-HT-receρtor agonist will stimulate the receptor and through regulatory feedback systems effect a decline in tyrosine or tryp- tophan hydroxylating activity, respectively, and a subsequent reduction in the synthesis rate for DA and 5-HT in the presynaptic neuron. Dopa and 5-HTP formation, as determined after in-vivo inhibition of the aromatic L-amino acid decarboxylase with NSD 1015 (3-hydroxybenzylhydrazine hydrochloride) are taken as indirect measures of DA- and 5-HT-synthesis rates, respectively as described by H. Wikstrom, et al. , J. Med. Chem. 27, 1030 (1984). The compounds of this invention are prepared by various means. The compounds of this invention wherein R3 is hydrogen, ._ is hydro- gen, ethyl or propyl, cyclopropylmethyl or cyclobutylmethyl and R2 is -CH2cycloalk lC3_ , alkyK^.g, -(C^ -R / , or -CH 2 CH 2 0(CH2) r CH3 are prepared by refluxing one equivalent of a salicyl aldehyde of formula C-l (see Chart 1) with one and one-half equivalents of 2-nitroethanol in a ylacetate in the presence of one and one-half equivalents of din-propylamine hydrochloride followed by azeotropic distillation for 12 hours in a Dean-Stark apparatus to give the 3-nitrochromene of formula C-3. The 3-nitrochromene is reduced with cyanoborohydride or zinc and HC1 to give the 3-aminochromane of C-4. The 3-aminochromane of C-4 can be acylated with an appropriate acid halide, e.g., acid chloride, of the formula RyCOhalide wherein y is allcylC^. , - CH2> t R wherein t is 1 or 2, cycloalkyl_g or -CH2θ CH2 m CH3 wherein R5 and m have the meanings in Formula I to give the chromane amides of formula C-5. Also the aminochromane of formula C-4 can be treated with methyl iodide to give the compound of formula C-6 wherein R- j _ is hydrogen and R__ is methyl or can be treated with formaldehyde in water in the presence of NaB^CN and a few drops of glacial acetic acid at pH5 to give the corresponding dimethylated compounds. The compounds of formulas C-5 and C-6 can be converted to the corresponding compounds of formulas C-7 and C-8 wherein R is F, Cl, CF3, NR 5 R 6 , NR 7 C(-0)R 8 , NR 9 C(-0)0R 10 , or NR 11 C(«-0)NR 12 R 13 as follows: (1) The compounds of C-5 and C-6 can be treated with sodium trifluoroacetate and copper iodide in DMPϋ at 160*C for four hours under argon to give C-7 and C-8 compounds wherein R is CF3. (2) Compounds of C-5 and C-6 can be treated with n-butyllithium in THF or ether letting the reaction begin at -78 β C using carbon dioxide/ice mixture, quenching the reaction at 0 β C and then letting the reaction mixture warm to room temperature to give the compounds of C-7 and C-8 wherein R is lithium. (3) The lithiated compounds can be treated with methoxylamine to give the corresponding amine, i.e., compounds of C-7 and C-8 wherein R is H2. (4) The C-7 and C-8 compounds wherein R is NH2 can be diazotized using diazonium hexafluorophosphate by procedures well known in the art to give the corresponding C-7 and C-8 compounds wherein R is fluoro. (5) The C-7 and C-8 compounds wherein R is NH2 also can be converted to the corresponding compounds wherein R is Cl by the well know Sandmeyer reaction. Additionally the C-7 and C-8 compounds can be converted to the corresponding compounds wherein R is R5R6, NR 7 C(-G)Rg, R9C(-0)0 -rj or R * LIC(-0)NR-L2 R 13 as follows. To prepare compounds of formula C-5 wherein R is NR5R 1 5 the corresponding amine substituted ©ompound is alk lated using an appropriate alkyl halide. C-5 compounds wherein R is NHC(-0)Rg are prepared by acylating the corresppnding amine substituted compound with a compound of the formula RgCOCl in methylenechloride in the presence of triethylamine. Alternatively, one could use a mixed anhydride reaction. Compounds of formula C-5 wherein R is NHC(-0)0R-Q can be prepared from the corresponding amine substituted compounds by treatment with phosgene or 1, X'-carbonyldiimidazole to give the corresponding carbamoylchlor- ide which is treated with an alcohol or phenol of the formula R-^ -OH to give the desired carbamate. The compounds of C-5 wherein Rg is NHC(-0)NR-> L 2R__3 , are Prepared from the corresponding amine substituted compounds by treatment with a suitable carbamoyl chloride of the formula in the presence of triethylamine, or by treatment of the above described carbamoyl chloride with a suitable amine of the formula R- j ^R- j ^ H in the presence of triethylamine. The corre¬ sponding compounds wherein R7, R9 or R-Q is alkyl are obtained by alkylation with an appropriate alkyl halide. The compounds of C-6 and the compounds of C-8 wherein R is as defined above excepting lithium are final products of the invention. The compounds of formula C-7 wherein R is other than lithium and the compounds of C-5 can be converted to final products of the invention, as represented by compounds of formula C-9 wherein R-^g is alkylC2_g, (CH 2 ) q R4, -CH 2 cycloalkylC3_g), or -CH 2 CH 3 0 CH2) r CH3 by mixed hydride reduction using, e.g., lithium aluminum hydride in ether or tetra¬ hydrofuran, sodium borohydride in acetic or trifluoroacetic acid, diborane in THF or QBH4 in a mixture of dichloromethane and dichloro- ethane wherein Q represents tetrabutylammonium ion. The reagent QBH4 is especially preferred when the amide compound is substituted on the aromatic ring with halogen and in particular bromine. The compounds of C-9 can also be used to prepare other compounds of the invention as represented by the compounds of C-ll wherein R_ is as defined above and RJ is alkylC2_3, cyclopropylmethyl or cyclobutylmethyl by treating the C-9 compounds with an appropriate acid halide of the formula R--C0 halide wherein R j . is methyl, ethyl, cyclobutylmethyl or cyclopropylmethyl to give the C-10 intermediate amide which is subjected to mixed hydride reduction as described above to give the C-ll compounds. To prepare compounds of this invention wherein R3 is -Salkyl- c _-_ the appropriate compounds of C-7 and C-8 wherein R is lithium as described above are treated with an appropriate alkyl disulfide of the formula to give compounds of formulas C-12 and C-13 respectively (see Formula Chart) wherein Ry, R- and Ri_ are as defined hereinabove. The compounds of formulas C-12 and C-13 can be treated in the same manner as described hereinabove for compounds of formulas C-5, C-6, C-7, C-8, C-9 and C-10 to give compounds of formula C-14 wherein X has the meaning defined in Formula I, R__ is H, alkylC^.3, cyclopropylmethyl or cyclobutylmethyl, and R* j _g is alkylC-^.g, -(CH 2 ) q -R4, -CH2cycloalk lC3_g or -CH 2 CH20(CH2) m CH3 wherein q, m, and R4 are as defined in Formula I. The sulfone and sulfoxide derivatives, i.e., compounds of formula I wherein R3 is -S(0)all ~ lC 1 _.3 or -S(-02alk lC-L.3 are prepared from the al lC-^- thio compounds by oxidation with m-chloroperbenzoic acid by proce¬ dures well known in the art. The compounds of this invention wherein R3 is OH can be prepared from the compounds of C-7 and C-8 wherein R is lithium by quenching the lithiated compound in nitrobenzene to give the compounds of formula C-15 and C-16. The compounds of C-15 and C-16 are then treated with BR2 dissolved in methylene chloride to give the com¬ pounds of formulas C-17 and C-18. After suitably protecting the OH group in the compounds of formulas C-17 and C-18 said compounds can be treated in the same manner as described hereinabove for compounds of formulas C-5, C-6, C-7, C-8, C-9 and C-10 and followed by removal of the hydroxy protecting group to give compounds of formula C-19 wherein X has the meaning defined in Formula I and R^ and R- j ^ have the meanings defined in formula C-14. The compounds of C-19 can be converted to the compounds of Formula I wherein R3 is alkoxy C^.g, alkenyloxyC3_g or -OCH2cycloalkylC3_g by treatment with an alkyl halide or tosylate R^X wherein R_ is alkylC-^.g, alkenylC3_g, or -CH2cycloall~ylC3_ and X or the halide is Cl, Br, I or T s O in an organic solvent such as acetonitrile or acetone and in the presence of a base such as potassium carbonate or sodium hydroxide. The compounds of this invention wherein R2 is -CH2CH2S(CH2) r CH3 can be obtained by reacting a ketone of formula C-20 with an alkyl- thiaalkylamine of the formula H2NCH2CH2S CH2 r CH3 wherein r is zero to 3 in the presence of NaBH3~ to give compounds of formula C-21 which can be treated with an appropriate acyl halide to give com- pounds of Formula I wherein R^ is alkylC^.3, cyclopropylmethyl or cyclobutylmethyl. The various X and R3 substituent groups on the aromatic ring of the compounds of Formula I can be obtained generally as described hereinabove. For example, a compound of C-21 could be converted to the corresponding hydroxy substituted compound which then could be alkylated to give the various alkoxy, alkenyloxy and cycloalkylmethoxy derivatives. Similarly other final products can be obtained by conversion of the aromatic substituent groups as gener¬ ally described hereinabove. The following detailed examples describe how to prepare the various compounds and/or perform the various processes of the invention and are to be construed as merely illustrative, and not limitations of the preceding disclosure in any way whatsoever. Those skilled in the art will recognize appropriate variations from the procedures both as to reactants and as to reaction conditions and techniques, Example 1 Preparation of Intermediate 6-Bromo-3-(di-n- propylamino)chromane The free base of 3-(di-n-propylamino)chromane (60 mg, 0.026 mmol) was converted to the hydrochloride with HC1-saturated EtOH. The residue after evaporation of the solvent and excess HC1 was dissolved in CH2CI2 and 4 equivalents of Br2 dissolved in CH2CI2 were added. The reaction was complete after 2 hours and water was added. The product was found in the organic layer, which was basified with 10% 2Cθ3. The organic phase was dried (Na2S0 , filtered and the solvent was evaporated, yielding an oil, which was converted to the hydrochloride with HCl-saturated EtOH. Crystals were formed from EtOAc-Hexane (30 mg) melting at 120'C. GC MS showed H + M+2 at m/e-310.95(10%)/312.95(10%) and the base peak pair at m/e-282.00 (100%)/284.00(97%). Example 2 Preparation of Intermediate 8-Bromo-3-chromanol TI2O3 (2.38 g, 5.2 mmol) was added at room temperature to a mixture of H2SO (6.9 ml) and water (6.1 ml) and this mixture was stirred for 30 min and added to o-allyloxy-bromo-benzene (1.9 g, 8.92 mmol) and water was added (37 ml) . The reaction mixture was stirred in 60"C under Argon. The product was extracted with CH2CI2 and the organic layer was washed with water, dried (Na2Sθ , filtered and the solvent was removed under reduced pressure to give 1.34 g of a raw oil, which was chromatographed (S102 and ether as eluant) . The fractions containing at least 85% purity of the product were pooled and the solvent was removed, yielding 310 mg of an oil. GC/MS showed M+/M+2 at m/e-228.00(100%)/230.00(88%). Example 3 Preparation of Intermediate 8-Bromo-3-chromanone The 8-bromo-3-chromanol was oxidized in small portions (400 mg, 1.7 mmol) in order to achieve better total yields. Dry pyridine (1.1 ml) was added to CH2CI2 (60 ml), dried over P2O5 and Crθ3 (0.69 g, 6.9 mmol) and molecular sieves were added to that solution. After 15 min the chromanol was added together with acetic anhydride (0.66 ml). The mixture was stirred for 10 min and then passed with suction through a column containing Siθ2 (10 g), eluting with CH2CI2. The collected eluate was evaporated and toluene was added after each evaporation (2-3 times), leaving the pure 8-bromo-3-chromanone (200 mg). GC/MS showed M+M+2 at m/e-226.25(89%)/228.25 (82%). Example 4 8-Bromo-3-(di-n-propylamino)chromane 8-Bro o-3-chromanol (80% according to GC, 0.8x0.69 g, 0.8x3.0- 2.4 mmol) was dissolved in dry benzene and di-n-propylamine (2 ml) and p-toluenesulfonic acid (60 mg) was added. The reaction mixture was refluxed under N2 and water separation in a Dean-Stark apparatus. The solvents were removed under reduced pressure and the residue was dissolved in MeOH (50 ml) and NaBH 3 CN (2.0 g) was added and the mixture was stirred overnight. Water (50 ml) and 15% NaOH (5 ml) was added and the product was extracted to CH2CI2. The organic layer was washed with water, dried (Na2SU ) , filtered and the solvents were removed under reduced pressure, leaving 700 mg of the raw product, which was chroπtatographed Siθ2, 100 g) using petroleum ether:ether (9:1) as the eluant. The fractions containing pure product were pooled and the solvent was evaporated. The residual oil was converted into the hydrochloride with HCl-saturated EtOH. Crystals (248 mg) melting at 135 β C were obtained from EtOAc/ether. GC/MS showed M+2 at m/e-311.05(7.7%)/313.05(8.7%) and the base peak pair at m/~-281.95X98%)/283.95(100%). Example 5 Preparation of Intermediate 5-Methoxy-3-chromanol and 7-methoxy-3-chromanol To a mixture of H2SO4 (50 ml) and water (58 ml) at room tempera¬ ture, TI2O3 (20.4 g, 44.7 mmol) was added. The mixture was stirred for 30 min and then another portion of water (350 ml) was added. The temperature was raised to 60 β C and 3-allyloxyanisol synthesized by known methods (14.6 g, 90.0 mmol) was added. The mixture was stirred for 16 hours. Another portion of TI2O3 (10.2 g, 22.3 mmol) stirred for 30 min at 20°C in H2SO4 (25 ml) and water (30 ml) was added and the reaction .mi"rture was stirred for another 12 hours at 60*C. The mixture was extracted after cooling with chloroform. The organic layer was washed with water, dried (MgS04) and the solvent was evaporated. The crude product was chromatographed (Siθ2) with ether as eluant. The 7-methoxy iso er eluted first as a pure product according to GC-analyses. „ The fractions containing enriched 5-methoxy isomer were further chromatiographed (SiO^r) with light petroleum ether (1:1) as eluant affording pure 5- and 7-methoxy isomers. The yields of these isomers were 1,16 g (8%) and 3.19 g (22%), respectively. Analytic samples of these isomers were obtained after recrystallization in light petrol- eum ether. The 5-methoxy isomer could alternatively be synthesized from 8- bromo-5-methoxy-3-chromanol (400 mg, 1.54 mmol) with catalytic hydrogenation (Pd/C) overnight in ethanol with 5N-NaOH solution in 90% yield. Analytical data of 5-methoxy-3-chromanol: m.p. 96-98. -H NMR (CDC1 3 ) 52.1-2.4 (s.br.lH), 2.7-2.8 (d.d.lH), 2.8-2.9 (d,d,lH), 3.8 (s,3H), 4.0-4.1 (s,br,2H), 4.2-4.3 (rn.lH), 6.4 (d.lH), 6.5 (d.lH), 7.0-7.1 (t,lH). 13 C NMR 8 28.40, 55.44, 62.98, 69.30, 102.53, 108.58, 109.31, 127.26, 154.60, 158.49. GC/MS (HP-5970A) m/e-180 (93)M + , 136 (100), 106 (44), 137 (23), 108 (22). Analytical data of 7-methoxy-3-chromanol: m.p. 62-64 β C. -H NMR (CDCL3) 8 1.95-2.0 (s.br.lH), 2.65-2.75 (d.d.lH), 2.25-3.10 (d.d.lH), 3.7 (s,3H), 4.0-4.1 (m,2H), 4.15-4.25 (m.lH), 6.4 (d,lH), 6.5 (d.d.lH), 6.95 (d,lH). 13 C NMR 8 32.94, 51.31, 63.40, 69.75, 101.52, 108.10, 111.23, 130.86, 154.49, 159.34. GC/MS (HP-5970A) m/e-180 (78) M+, 136 (100), 137 (79), 108 (61), 78 (28). Example 6 Preparation of Intermediate 3-Allyloxy-4-bromoanisol To a solution of 4-bromo-3-hydroxyanisol (14.49, 59.3 mmol), synthesized by known methods, in CH3CN (200 ml), dry potassium carbonate (20 g) and allylbromide (8.0 ml, 92.4 mmol) was added. The reaction mixture was stirred and refluxed for 1 hour and thereafter cooled to room temperature, filtered and evaporated. The residue was dissolved in ether and extracted with water. The organic layer was separated and dried (Na2Sθ ) . Evaporation of the solvent afforded 16.0 g (93%) of 3-allyloxy-4-bromoanisol as an oil. GC/MS (HP-5970A) m/e-244 (40) M+ and + -1 at m/e-242 (40), 163 (100), 149 (97), 135 (62). Example 7 Preparation of Intermediate 8-Bromo-5-methoxy-3- chromanol To a mixture of H2SO4 (6.9 ml) and water (6.1 ml) at room temperature was added TI2O3 (2.38 g, 5.22 mmol). The mixture was stirred for 30 min and water (37 ml) was added, thereafter the temperature was raised to 60*C and 3-allyloxy-4-bromoanisol (2.16 g, 8.89 mmol) was added. The mixture was stirred at 60*C for 4.5 hours. Another portion of TI2O3 (1.0 g, 2.19 mmol) stirred for 30 min at 20 * C in H2SO4 (2.6 ml) and H 2 0 (3 ml) was added and the reaction mixture was stirred for another 17 hours at 60 β C. After cooling the mixture was extracted with chloroform. The organic layer was washed with water, dried MgS04 and evaporated. After chromatograhy (S10 2 ) with ether as eluant, 552 mg (24%) of 8-bromo-5-methoxy-3-chromanol was isolated. An analytic sample of the product was obtained from recrystallization in light petroleum-ether, m.p. 115-117"C. -H NMR (CDC1 3 ) 8 2.0-2.1 (s.br.lH), 2.7-2.8 (d,d,lH), 2.9-3.0 (d.d.lH), 4.1 (s,3H), 4.8-5.0 (m,3H), 6.4 (d,lH), ' 7.3 (d.lH). 13 C NMR 8 28.65, 55.64, 62.64, 70.08, 101.85, 103.79, 110.34, 130.49, 150.75, 157.70. GC/MS (HP-5970A) , m/e-260 (99) M+l, 258 (100) M-l, ' 216 (93), 214 (91), 185 (50). Preparation of Intermediate 8-Bromo-5-methoxy-3- chromanone To a solution consisting of dry pyridine and CH2CI2 (120 ml, dried over P2O5 Crθ3 (435 mg, 4.35 mmol) was added. The mixture was stirred for 15 min and 8-bromo-5-methoxy-3-chromanol (293 mg, 1.13 mmol) was dissolved in 10 ml dry CH2CI2 was added and immediately thereafter acetic acid anhydride (0.41 ml, 4.35 mmol) was added to the solution. The mixture was stirred for 10 min and then sucked through a short silica column (13 g Siθ2) with vacuum. The column was washed with CH2-I2 an - - ~ - e s °l ve~ tt evaporated yielding 237 mg (81%) of the product. An analytic sample was obtained from recrys- tallization in light petroleum-ether, m.p. 97-100'C. --H NMR (CHCI3) 8 3.55 (s,2H), 3.80 (s,3H), 4.45 (s,2H), 6.5 (d.lH), 7.4 (d,lH). GC/M (HP-5970A) m/e-258 (64) M+l, 256 (57) M-l, 134 (100), 50 (11), 76 (11). Tf-~ , " P '1 ~ 9 Preparation of Intermediate 5-Methoxy-3-chrom_ιnone 5-Methoxy-3-chromanone was obtained from oxidation of 5-methoxy- 3-chromanol (2.5 mmol) analogously with the synthesis of 8-bromo-5- methoxy-3-chromanone above in 62% yield. GC/MS (HP-5970A), m/e-178 (100) M+, 177 (83), 135 (20), 43 (22), 91 (18). .xflτtι ' «» ;in Preparation of Intermediate 8-Bromo-3-(di-n- propylamino)-5-methoxychroman To a solution of 8-bromo-5-methoxy-3-chromanone (550 mg, 2.14 mmol) in benzene (40 ml), di-n-propylamine (1.8 ml, 13.2 mmol) and p- toluenesulfonic acid, monohydrate (41 mg, 0.32 mmol) was added. The solution was refluxed for 5 hours with a Dean-Stark apparatus under nitrogen atmosphere. After cooling to room temperature a solution of sodium cyanoborohydride (2.0 g, 32 mmol) dissolved in MeOH (50 ml) was added and thereafter stirred overnight. Water was added (50 ml) and 5% NaOH-solution (5 ml). The solution was extracted with CH2CI2. The organic layer was separated, washed with water and dried Na2S0 ) . The solvent was evaporated and the residue was chromato- graphed (Siθ2) with light petroleum-ether (3:1) as eluant yielding 550 mg (75%) as an oil. The amine was converted to its hydrochloride with HCl-saturated ethanol. Evaporation and recrysstallization (ethanol-ether) gave the product as crystals. m.p. 180-182 β C. -H NMRA (CDC1 3 ) 0.6-0.9 (t,6H), 1.1-1.6 (m,4H), 2.5-3.3 (m,8H), 3.75 (s,3H), 4.2-4.5 (m.lH), 6.25-6.35 (d,lH), 7.2- 7.4 (d,lH). GC/MS (HP-5970A), m/e-343 (10) M+l, 341 (10) M-l, 312 (100), 314 (91), 241 (80). Anal. (C 16 H 2 5BrN0 2 Cl) Calcd. C 50.7, H 6.7, N 3.7. Found C 50.2, H 6.6, N 3.5. Example 11 Preparation of Intermediate 3-(Di-n-propylamino)-5- methox chroman To a solution of 8-bromo-5-methoxy-3-chromanone (125 mg, 0.49 mmol) in benzene (20 ml) was added di-n-propylamine (0.5 ml, 3.7 mmol) and p-toluenesulfonic acid monohydrate (10 mg, 0.08 mmol). The solution was refluxed for 5 hours with a Dean-Stark apparatus under N2-atmosphere. The reaction mixture was poured into a Parr-flask, absolute ethanol was added (50 ml) and pH was adjusted to 11 with 2M- NaOH-solution. The product was hydrogenated overnight with Pd/C as catalyst. The catalysst was filtered off and the solvent was evaporated. The residual oil was dissolved in CH2CI2 and washed with 5% aqueous Na2Cθ . The phases were separated and the organic layer was dried ( 2C03) yielding 99 mg (77%) of the product as an oil with physical data identical with authentic material synthesized by alternative methods. Example 12 Preparation of Intermediate 5-Methoxy-8-methylthio-3- (di-n-propylamino)chroman A solution of 8-bromo-5-methoxy-3-(di-n-propylamino)chromane (174 mg, 0.51 mmol) in dry ether was treated with 1.6 M-n-BuLi in hexane (0.6 ml, 0.96 mmol) at O'C for 30 min under dry Ar-atmosphere. Dry, distilled methyl disulfide was added (0.2 ml, 2.3 mmol) and the mixture was stirred for 2 hours at O'C and was then allowed to reach room temperature. Water was added and the phases were separated. The organic layer was washed with water, separated and dried (Na2Sθ . The solvent was evaporated and the remaining oil chromato- graphed (Siθ2 with light petroleum-ether (3:1) as eluant yielding 105 mg (67%) of the product as an oil. The amine was converted to its hydrochloride with HCl-saturated ethanol. Evaporation and recrystallization from light petroleum-ether gave the product as crystals. m.p. 138-140 β C. -H NMR (CDC1 3 ) 8 0.7-1.1 (t,6H) 1.2-1.7 (m,4H), 2.4 (s,3H), 2.4g-3.40 (m,8H), 3.9 (s,3H), 4.4-4.6 ( .lH) 6.45-6.55 (d.lH), 7.15-7.30 (d,lH). GC/MS (HP-5970A) , m/e-309 (41) . 209 (100), 280 (99), 162 (26), 281 (19). Anal. (C 17 H 2 8N02SC1) Calc. C 59.0, N 8.2, H 4.1. Found C 58.5, N 8.3, H 4.0. • Example 13 Preparation of Intermediate 5-Methoxy-3-(N- methylthioethyl-N-propionylamino)chroman To_ a solution of the appropriate amine (400 mg, 2.27 mmol) and acetic acid (400 mg, 6.99 mmol) in absolute ethanol (10 ml) was added 5-methoxy-3-chromanone (250 mg, 1.40 mmol), followed by 2- methylthioethylamine (0.6 ml, 6.41 mmol). The solution was stirred with 4 A molecular sieve for 1 hour 15 min. MeOH (25 ml) was added to the reaction mixture and sodium cyano-borohydride (1.5 g, 23.6 mmol) dissolved in MeOH (10 ml) . The reaction mixture was stirred for 30 min, water was added (50 ml) and pH adjusted with 5% aqueous NaOH to 11. The mixture was extracted with CH2CI2. The phases were separated and-the organic layer washed with water, dried (Na2Sθ4) and the solvent wa-S evaporated. The crude product was immediately propionylated with propionyl chloride (0.5 ml, 5.72 mmol) in CH2CI2 (20 ml^ containing- triethylamine (1 ml, 7.2 mmol). The reaction jπixture was stirred for 30 min, washed with aqueous sodium carbonate solution, IN HC1 and water. The organic layer was separated and dried (MgSQ.4) . The solvent was evaporated and the crude product chromatographed Siθ2) with light petroleum-ether (1:1) as eluant yielding 276 mg (64%) of the product as an oil. GC/MS (HP-5970A) , ^ m/e-310 I0.2 M+, 162 (100), 161 (54), 163 (50), 192 (22). High resolution MS with FAB ionisation showed M+ at m/e 311.141 + 10 pp . (Calc 311.157). -H NMR (CDCI3) 8 1.1-1.3 (t,3H), 1.90-3.05 (m,9H), 3.30-3.65 (m,2H), 3.85 (s,3H), 4.05-4.40 (t,br,2H), 4.5-4.8 (s.br.lH), 6.4-6.7 (d,d,2H), 7.05-7.3 (t.lH). Example 14 Preparation of Intermediate 5-Methoxy-3-(N- methylthioethyl-N-n-propylamino)chroman A solution of 5-methoxy-3-(N-methylthioethyl-N-propionylamino)- chroman (207 mg, 0.70 mmol) in dry ether (10 ml) was cooled with ice and L1A1H (250 mg, 6.59 mmol) was added. The mixture was stirred at 0"C for 40 min. Usual workup gave 195 mg (99%) of the amine as an oil. GC/MS (HP-5970A), at m/e-295 (0.1) M+, 163 (100), 234 (98), 235 (15), 164 (10). High resolution MS with FAB ionisation showed M+ at m/e-296.165 + 10 ppm (Calc. 296.168). -H NMR (CDC1 3 ) 8 0.80-0.95 (t,3H), 1.40-1.55 (m,2H), 2.10 (s,3H), 2.45-3.20 (m,8H), 3.70-3.90 (m,2H), 3.90 (s,3H), 4.2-4.3 (m.lH), 6.40-6.55 (d,d,2H), 7.0-7.1 (t,lH). Example 15 Preparation of Intermediate 5-Hydroxy-3-(N- methylthioethyl-N-n-propylamino)chroman A solution of 5-hydroxxy-3-(N-methylthioethyl-N-n-propylamino)- chroman (166 mg, 0.56 mmol) in 48% aqueous HBr was heated at 120°C for 30 min under nitrogen. The hydrobromic acid was evaporated and the residue was evaporated several times with absolute ethanol. Water was added and pH adjusted to 11 with 10% Na2Cθ3~solution. The aqueous solution was extracted with CH2CL2. The organic layer was separated, dried and the solvent was evaporated. The crude product was chromatographed (SiU2) with light petroleum:ether (3:1) as eluant yielding 85 mg (54%) of 5-hydroxy-3-(N-methylthioethyl-N-n-propyl- a ino)chroman as an oil. The amine was converted to its hydrochlor¬ ide with HCl-saturated ethanol. Evaporation and recrystallization gave the product as crystals. m.p. 125-130-C. -H NMR (CDCI3) 8 0.85-1.0 (t,3H), 1.4-1.8 (m,2H), 2.1 (s,3H), 2.45-3.15 (m,9H), 3.8-4.1 (m,br,2H), 4.25-4.35 (m.lH), 6.2-6.5 (d,2H), 6.9-7.0 (t, 1H). High resolution MS shows M+ at m/e-281, 144+ 10 ppm (9). (Calc. 281 (145), 234 (100), 220 (89), 121 (31), 221 (15). Example 16 Preparation of 8-Bromo-3-(N-methylcyclopropyl-N-n- propylamino)chroman Commercially available 3-bromosalicylaldehyde (0.5 g; 2.5 mmol), di-n-butylammonium chloride (0.2 g; 1.2 mmol) and 2-nitroethanol (0.36 g; 4.0 mmol) were refluxed for 8 hours in i-pentylacetate with a Dean-Stark apparatus under nitrogen atmosphere. The solvent was evaporated and the product was dissolved in dichloromethane (15 ml) and cyanoborohydride (0.5 g; 8.1 mmol) in methanol (15 ml) was added. The mixture was stirred for 30 minutes at room temperature. Water was added and the mixture extracted with dichloromethane. The phases were separated and the organic layer was dried (MgSθ4) . The solvent was evaporated yielding 400 mg (63%) of 8-bromo-3-nitrochroman as an oil. 8-Bromo-3-nitrochroman (400 mg; 1.55 mmol) was dissolved in glacial acetic acid (30 ml) and zinc dust (2 g) was added. The mixture was heated to 100°C for 15 minutes. The zinc dust was filtered off and washed with dichloromethane. The solvent was evaporated and the remaining oil extracted with diluted hydrochloric acid/dichlorome hane. The phases were separated and the pH of the water layer was adjusted to 11 with 2N NaOH. The water layer was extracted with dichloro-methane. The phases were separated and the organic layer dried (Na2SU4) . The solvent was evaporated yielding 214 mg (61%) of 8-bromo-3-aminochroman. To a mixture of 8-bromo-3-aminochroman (200 mg; 0.9 mmol) in CH2CI2 (25 ml) and 10% aqueous Na2C03 (25 ml) was added propionyl chloride (400 mg; 2.2 mmol) and the mixture was stirred for 2 hours. The phases were separated and the organic layer was dried (MgS04) . The solvent was evaporated and the crude amide was reduced with tetrabutylammonium borohydride (400 mg, 1.6 mmol) in a boiling (1:1)- mixture (50 ml) of dichloromethane and 1,2-dichloroethane overnight. The solution was extracted with water, dried (Nβ2S04) and the solvent was evaporated yielding 140 mg (58%) of 8-bromo-3-(n- propylamino)chroman. To a mixture of 8-bromo-3-(n-propylamino)chroman (120 mg; 0.5 mmol) in dichloromethane (20 ml) and 5% aqueous Na2Cθ (20 ml) was added cyclopropanecarbonyl chloride (300 mg; 3.5 mmol). The mixture was stirred for 2 hours, the phases were separated and the organic layer dried (MgSU4). The solvent was evaporated and the crude amide was reduced with tetrabutylammonium borohydride (500 mg, 2.0 mmol) in a boiling (1:1)-mixture (50 ml) of dichloromethane and 1,2- dichloroethane for 24 hours. Hydrochloric acid (1M; 10 ml) was added and the phases were stirred for 1 hour at room temperature. pH was adjusted with 2M aqueous NaOH to 11 add the phases were separated. The organic layer was dried (Nβ2S0 ) and the solvent evaporated yielding an oil, which was chromatographed (Siθ2) eluting with light petroleum:ether (3:1). The fractions containing pure product were pooled yielding 100 mg (61%) of 8-bromo-3-(N-methylcyclopropyl-N-n- propylamino)chroman. GC/MS showed K M+2 at m/e-323(ll%)/325(10% and the base peak pair m/e-294(110%)/296(98%) . Example 17 Preparation of 6-Methylthio-3-(di-n-propylamino)- chroman A solution of 6-bromo-3-(di-n-propylamino)chroman (300 mg) in dry ether was treated with 1.6 M n-BuLi in hexane (2.0 ml, 1.44 mmol) at O'C for 30 minutes under dry Ar-atmosphere. Dry, distilled dimethyl disulphide was added (0.5 ml, 5.8 mmol) and the mixture stirred for 2 hours at 0 β C. The mixture was allowed to reach room temperature overnight, water was added and the phases were separated. The organic layer was washed with water, separated and dried (N 2Sθ4) . The solvent was evaporated and the remaining oil chromatographed (Siθ2) with petroleum ether/ether (9:1) as eluant, yielding 57 mg of 6-methylthio-3-(di-n-propylamino)chroman as an oil. The amine was converted to its hydrochloride with HCl-saturated ethanol. Example 18 Preparation of Carbamoyl-Chromans A solution of 6-bromo-3-(di-n-propylamino)chroman (900 mg) in dry ether was treated with 1.6 M n-BuLi in hexane (0.9 ml, 1.44 mmol) at 0 β C for 2 hours under .dry Ar-atmosphere. (The progress of the lithiation was checked by quenching small samples of the reaction mixture with dimethylformamide and running GC analysis of the product mixture formed.) The reaction mixture was poured into a CO2- saturated solution (-78"C) in dry ether, prepared by adding Cθ2(s) (20 g) to dry ether (50 ml) . The mixture was allowed to stand overnight to reach room temperature and then water was added and the solvents were evaporated under reduced pressure. The residual mixture, 3-(di-n-propylamino)chromane-6-carbocxylic acid, was used in the next step without further purification. The raw product from the previous reaction step was treated with CH 2 C1 2 (25 ml) and S0C1 2 (5 ml) and refluxed for 2 hours. The solvents were removed under reduced pressure and 3-(di-n- propylamino)chromane-6-carboxylic acid chloride was used in the syntheses described below without further purification. A fraction of the raw acid chloride above (corresponding to 100 mg of pure product) was dissolved in CH2CI2 (10 ml), and 10% Na2Cθ3 (10 ml) was added before the addition of benzylamine (1 ml) . Wor up was performed through extraction with 10% HC1, basification (10% NaOH) and CH2CI2 extraction, yielding 150 mg of an oil which was chro atographed (Siθ2 and eluting with C^C^MeOH (45:1), yielding 20 mg of 3-(di-n-propylamino)-6-(benzyl)carbamoyl-chromane. A fraction of the raw acid chloride above (corresponding to 100 mg of pure product) was dissolved in CH2CI2 (10 ml) , and 10% Na2CU3 (10 ml) was added before the addition of di-n-propylamine (3 ml) . Workup was performed through extraction with 10% HC1, basification (20% NaOH) and CH2CI2 extraction, yielding 150 mg of an oil which was chromatographed Siθ2 and eluting with CH 2 Cl 2 :Me0H (9:1), yielding 15 mg of 3-(di-n-propylamino)-6-(di-n-propyl)carbamoyl-chromane. A fraction of the raw acid chloride above (corresponding to 100 mg of pure product) was dissolved in CH2CI2 (20 ml) , and 10% Na2C03 (20 ml) was added before the addition of saturated NH3 in water (3 ml). Workup was performed through extraction with 10% HC1, basification (10% NaOH) and CH2CI2 extraction, yielding 100 mg of an oil which was chromatographed (Siθ2 and eluting with CH2Cl2:MeOH (1:1), yielding 12 mg of 3-(di-n-propylamino)-6-carbamoyl-chromane. Example 19 . Preparation of 6-Formamido-3-(di-n-propylamino)- chromane and 6-hydroxymethyl-3-(di-n-propylamino- chromane A solution of 6-bromo-3-(di-n-propylamino)chroman (190 mg) in dry ether was treated with 1.6 M n-BuLi in hexane (2.0 ml, 1.44 mmol) at O'C for 30 minutes under dry Ar-atmosphere. Dry, dimethylformamide (1.5 ml) was added and the mixture stirred for 2 hours at O'C. The mixture was allowed to reach room temperature overnight, water was added and the phases were separated. The organic layer was washed with water, separated and dried ( a2SU4) . The solvent was evaporated and the remaining oil chromatographed (Siθ2) with petroleumether/ether; 3:1 as eluant, yielding 23 mg of the formamide and 21 mg of the hydroxymethyl analog as oils. FORMULA r.HAR Formula I C-12 C-13 C-18 C-19 CHART 1 C-l C-2 © C-7 C-6 © C-ll

Claims: CLAIMS 1. A compound of the formula wherein: R is hydrogen, alkyl C .3 straight or branched, cyclopropyl¬ methyl, or cyclobutylmethyl; R2 is alkyl C-^. , -(CH 2 )q-R4. -CH2-cycloalkyl C3_ ; or -CH2CH2Z(CH2) m CH3; wherein R4 is phenyl; phenyl substituted by one or two substituents selected from Cl, F, Br, alkoxy C .3 or alkyl Cχ.3; 2-thiophene; or 3-thiophene; q is 1 to 3; m is zero to 3; and Z is -0- or -S-; R3 is hydrogen, -Salkyl Cχ_3, -S(0)alkyl C . 3 , -S(-0)2 alkyl Cχ_ 3, alkoxy C .g, alkenyloxy C3_g, -OCH2-cycloalkyl 03.g, or hydroxy with the proviso that when R3 is hydroxy or alkoxy C .g, either R- is cyclopropylmethyl or cyclobutylmethyl or R2 is cycloalkyl C3_g-CH2-; 0 0 X is hydrogen, F, Cl, Br, CF3, -NR 5 Rg, -NR 7 CR 8 , -NR 9 COR 10 , 0 NR CNR 1 2 R 13 wherein R5, Rg, R 7 , R 9 , Rχ f R 2 and R ] are hydrogen or alkyl C .5, or NR5Rg taken together form a monocyclic heterocyclic group selected from pyrrolidino, piperidino, piperazino, N- methylpiperazino, morpholino, or thiomorpholino; Rg is hydrogen or alkyl C_._ ', and R o is alkyl C .5 or -(CH2) n phenyl wherein n is zero to 2; and pharmaceutically acceptable salts thereof. 2. The compound of Claim 1 wherein X is F, Cl, Br or H2 at the 8- carbon position. 3. The compound of Claim 2 wherein X is Br at the 8-carbon position. 4. The compound of Claim 1 wherein R3 is hydrogen or alkoxy Cχ"g. 5. The compound of Claim 4 wherein R3 is methoxy. 6. The compound of Claim 1 wherein R^ and R2 are alkyl C .3 straight or branched. 7. The compound of Claim 6 wherein R and R2 are n-propyl. 8. The compound of Claim 1 which is a) 8-Bromo-3- (di-n-propylamino) chroman, b) 8-Bromo-3- (N-methylcyclopropyl-N-n-propylamino)chroman, c) 6-methylthio-3- (di-n-propylamino)chroman, d) 3- (Di-n-propylamino) -6- (benzyl) carbamoyl -chromane , e) 3- (Di-n-propylamino) -6- (di-n-propyl)carbamoyl-chromane , f ) 3- (Di-n-propylamino) -6 -carbamoyl- chromane , g) 6-Formamido-3- (di-n-propyl.amino)chromane , or h) 6-Hyd oxymethyl-3- (di-n-propylamino)chromane .

Inventors: ANDERSSON BENGT RONNY, CARLSSON PER ARVID EMIL, HALLBERG ANDERS RUDOLF, SVENSSON KJELL ANDERS IVAN, WIKSTROM HAKAN VILHELM, ANDERSSON, BENGT, RONNY, CARLSSON, PER, ARVID, EMIL, HALLBERG, ANDERS, RUDOLF, SVENSSON, KJELL, ANDERS, IVAN, WIKSTROM, HAKAN, VILHELM
Applicants: UPJOHN CO, THE UPJOHN COMPANY
Application year: 1990
Main classification: C07D311
IPC codes: A61K31, A61P25, C07D311