Oxaspiro[2,5]octane derivative

Abstract: An oxaspiro[2,5]octane derivative of the formula : wherein R¹ is carbamoyl; lower alkylcarbamoyl; hydroxy(lower)alkylcarbamoyl; lower alkoxy(lower)alkylcarbamoyl; lower alkylthio(lower)alkylcarbamoyl; lower alkoxycarbonyl(lower)alkylcarbamoyl; lower alkylcarbamoyloxy(lower)­ alkylcarbamoyl; di(lower)alkylcarbamoyl; N-[hydroxy(lower)alkyl](lower)­ alkylcarbamoyl; N-[hydroxy(lower)alkyl](lower)alkyl­ carbamoyloxy(lower)alkylcarbamoyl; lower alkylcarbamoyloxy(lower)alkenoyl; N-[heterocycliccarbonyloxy(lower)alkyl]­ (lower)alkylcarbamoyl; cyclo(lower)alkylcarbamoyl; arylcarbamoyl; haloarylcarbamoyl; protected carbamoyl; lower alkylthiocarbamoyl; heterocycliccarbamoyl; ar(lower)alkenoyl; lower alkoxycarbonyl; heterocycliccarbonyl which may have lower alkyl, hydroxy, hydroxy(lower)alkyl, lower alkoxy(lower)alkyl or lower alkoxycarbonyl; lower alkyl; carboxy(lower)alkyl; protected carboxy(lower)alkyl; ar(lower)alkyl which may have halogen or lower alkoxy; heterocyclic(lower)alkyl; lower alkylcarbamoyl(lower)alkyl; hydroxy(lower)alkenoyl; acyloxy(lower)alkenoyl; or diacyloxy(lower)alkenoyl; R² is lower alkoxy and or pharmaceutically acceptable salt thereof. A process for preparing the oxaspiro [2,5] octane derivative is also described, together with a pharmaceutical composition comprising the same as an active ingredient. The compounds exhibit angiogenesis inhibitory activity and are therefore useful in the treatment of, for example, tumours, rheumatoid arthritis, diabetic retinopathy and psoriasis.

Description: This invention relates to new oxaspiro[2,5]octane derivatives and salts thereof. More particularly, it relates to such compounds having an angiogenesis inhibitory activity and which are therefore useful as angiogenesis inhibitors, especially for the treatment of solid tumors, to processes for the preparation thereof and to pharmaceutical compositions comprising the same. JP Kokai Nos. 00476/1987, 33181/1986 and 257921/1986 describe various oxaspiro[2,5]octane derivatives and which are said to exhibit immunosuppressive activities. The oxaspiro[2,5]octane derivatives of this invention can be represented by the following formula : wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy(C₁-C₆)-alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or pharmaceutically acceptable salt thereof. The salts of the object compound (I) are preferably pharmaceutically acceptable salts thereof and may include a metal salt such as an alkali metal salt (e.g., sodium salt, potassium salt) and an alkaline earth metal salt (e.g., calcium salt, magnesium salt), ammonium salt, an organic amine salt (e.g., trimethylamine salt, triethylamine salt, pyridine salt, picoline salt, dicyclohexylamine salt, N,N'-dibenzylethylenediamine salt), an organic acid salt (e.g, acetate, maleate, tartrate, methanesulfonate, benzenesulfonate, toluenesulfonate), an inorganic acid salt (e.g. hydrochloride, hydrobromide, sulfate, phosphate), or a salt with an amino acid (e.g., arginine, aspartic acid, glutamic acid). According to this invention, the object compound (I) and pharmaceutically acceptable salt thereof can be prepared by, for example, the following processes. wherein R¹, R² and R³ are each as defined above. R 1 / a is carbamoyl, C₁-C₆ alkylcarbamoyl, hydroxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R 1 / b is C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; R 1 / c is a protected carbamoyl, R 1 / d is a protected carboxy(C₁-C₆)alkyl or a protected carboxy(C₁-C₆)alkylcarbamoyl, R 1 / e is carboxy(C₁-C₆)alkyl, X is acid residue, R 1 / f is C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; morpholinocarbonyl; morpholinocarbamoyl: thiomorpholin-4-ylcarbonyl; piperidinocarbonyl; piperidinocarbamoyl; hydroxypiperidinocarbonyl; C₁-C₆ alkylpiperidinocarbonyl; 2-oxopyrrolidin-1-yl(C₁-C₆)alkylcarbamoyl; hydroxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; C₁-C₆ alkoxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; pyperazin-1-ylcarbonyl;or C₁-C₆ alkoxycarbonylpiperazin-1-ylcarbonyl; R⁴ is hydroxycarbonyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxycarbonyloxy(C₁-C₆)alkyl]-(C₁-C₆)alkylcarbamoyl or hydroxycarbonyloxypiperidinocarbonyl, R 1 / g is C₁-C₆ alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl, N-[thiomorpholin-4-ylcarbonyloxy-(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl, N-[morpholinocarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl or C₁-C₆ alkylcarbamoyloxypiperidinocarbonyl, R 3 / a is R 3 / b is R 3 / c is wherein R⁶ is protected carboxy, R⁵ is aryl, R 1 / h is thiomorpholin-4-ylcarbonyl or R 1 / i is 1-oxothiomorpholin-4-ylcarbonyl, 1,1-dioxothiomorpholin-4-ylcarbonyl or -COCH=CHCHO, R 3 / d is or wherein R⁶ is the same as defined above, R 3 / e is or wherein R⁶ is the same as defined above, R 3 / f is wherein R⁷ is a protected carboxy-(C₁-C₆)-alkyl, or phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen, R 3 / g is wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl R 1 / j is or -COCH=CHCH₂OH R 1 / k is wherein R⁸ is C₁-C₆ alkylsulfonyl wherein R⁸ is C₁-C₆ alkanoyl or phenyl(C₁-C₆) alkanoyl or -COCH=CHCH₂OR⁸ wherein R⁸ is C₁-C₆ alkanoyl R 1 / ℓ is carboxy(C₁-C₆)alkyl and R 1 / m is lower alkylcarbamoyl(C₁-C₆)alkyl. The starting compound (II) can be prepared in a conventional manner as, for example, that described in Journal of the American Chemical Society 94 , 2549 (1972). The starting compounds (III) and (IV) can also be prepared in a conventional manner as illustrated in working Examples mentioned below. The salts of the compound (Ia), (Ib), (Ig) and (It) may include an inorganic or organic acid salt as those exemplified in the explanation of the salts of the object compound (I). The salts of the compound (If) and (III) may include a metal salt, ammonium salt or an organic amine salt as those exemplified in the explanation of the salts of the object compound (I). The salts of the compounds (Ii), (Ij), (Ik), (In), (Io), (Ir) and (Is) are the same salt as those exemplified in the explanation of the salts of the object compound (I). In the above and subsequent descriptions of this specification, suitable examples and illustrations of the various definitions are explained in detail in the following. The term "lower" is intended to mean 1 to 6 carbon atom(s), unless otherwise indicated. Suitable "C₁-C₆ alkyl" in the terms "C₁-C₆ alkylcarbamoyl", "hydroxy(C₁-C₆)alkylcarbamoyl", "(C₁-C₆) alkoxy(C₁-C₆)alkylcarbamoyl", "C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl", "C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl", "C₁-C₆ alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl", "di(C₁-C₆)alkylcarbamoyl", "N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl", "N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl", "C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl", "N-[thiomorpholinylcarbonyloxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl", "C₁-C₆ alkylthiocarbamoyl", "C₁-C₆ alkyl", "hydroxy(C₁-C₆)alkyl", "C₁-C₆ alkoxy(C₁-C₆)alkyl", "carboxy(C₁-C₆)alkyl", "protected carboxy(C₁-C₆)alkyl", "C₁-C₆ alkylcarbamoyl(C₁-C₆)-alkyl", "hydroxycarbonyloxy(C₁-C₆)alkylcarbamoyl", "N-[hydroxycarbonyloxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl", "N-[thiomorpholin-4-ylcarbonyloxy(C₁-C₆)alkyl](C₁-C₆)-alkylcarbamoyl", "N-[morpholinocarbonyloxy(C₁-C₆)alkyl]-(C₁-C₆ )alkylcarbamoyl" and "C₁-C₆ alkylcarbamoyloxypiperidinocarbonyl" may include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, hexyl. Suitable "C₁-C₆ alkoxy" in the terms "C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl", "C₁-C₆ alkoxycarbonyl(C₁-C₆)alkycarbamoyl", "C₁-C₆ alkoxycarbonyl" and "C₁-C₆ alkoxy(C₁-C₆)alkyl" may include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy. Suitable "C₁-C₆ alkylthio" in the term "C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl" may include methylthio, ethylthio, propylthio, butylthio, pentylthio and hexylthio. Suitable "C₃-C₆ alkenoyl" in the term "C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl" and "hydroxy(C₃-C₆)alkenoyl" include acryloyl and crotonoyl. Suitable "cyclo(C₃-C₇)alkylcarbamoyl" may include cyclopropyl-carbamoyl, cyclobutylcarbamoyl, cyclopentylcarbamoyl, cyclohexylcarbamoyl and cycloheptylcarbamoyl. Suitable "halogen" in the terms "halo" and "halogen" may include chlorine, bromine, iodine and fluorine. Suitable "protected carbamoyl" is carbamoyl protected by a conventional carbamoyl protective group such as trichloroacetyl. Suitable "protected carboxy" in the terms "protected carboxy (C₁-C₆) alkyl" and "protected carboxy" may include an esterified carboxy such as C₁-C₆ alkoxy carbonyl (e.g. methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, pentyloxycarbonyl, hexyloxycarbonyl). Suitable "acid residue" may include halogen (e.g. fluorine, bromine, iodine, chlorine). The process as illustrated above is explained in more detail in the following. Process 1 : The object compound (Ia) or salt thereof can be prepared by reacting the compound (II) with the compound (III) or reactive derivatives thereof or salt thereof. The reactive derivatives of the compound (III) may include acid halide (e.g. acid chloride ), acid anhydride, activated amide, activated ester, isocyanate (e.g. C₁-C₆ alkylisocyanate, cyclo(C₁-C₆)alkylisocyanate, arylisocyanate ). The reaction is preferably conducted in the presence of an organic or inorganic base as those exemplified in the explanation of the Process 2. This reaction is usually carried out in a solvent which does not adversely influence the reaction such as methanol, ethanol, propanol, tetrahydrofuran, chloroform. The reaction temperature is not critical and the reaction can be carried out under heating to under cooling. Process 2 : The object compound (Ib) or salt thereof can be prepared by reacting the compound (II) with the compound (IV). This reaction is usually carried out in a solvent which does not adversely influence the reaction such as N,N-dimethylformamide, dimethylsulfoxide, tetrahydrofuran. The reaction can preferably be conducted in the presence of an organic or inorganic base such as alkali metal (e.g. sodium), alkaline earth metal (e.g. calcium), alkali or alkaline earth metal hydride (e.g. sodium hydride, calcium hydride ), alkali or alkaline earth metal hydroxide (e.g. sodium hydroxide, potassium hydroxide, calcium hydroxide ), alkali or alkaline earth metal carbonate or bicarbonate (e.g. sodium carbonate, potassium carbonate, sodium bicarbonate), alkali or alkaline earth metal alkoxide (e.g. sodium ethoxide, lithium methoxide, magnesium methoxide), trialkylamine (e.g. triethylamine), pyridine, bicyclodiaza compound (e.g. 1,5-diazabicyclo[3,4,0]nonene-5,1,5-diazabicyclo[5,4,0]undecene-5). The reaction temperature is not critical and the reaction can be carried out under cooling to under heating. Process 3 : Compound (Ic) → Compound (Id) Process 4 : Compound (Ie) → Compound (If) The compound (Id) or (If) can be prepared by subjecting the compound (Ic) or (Ie) to the removal reaction of the carbamoyl-(or carboxy-)protective group. The removal reaction of this process may include hydrolysis or reduction. The hydrolysis is preferably carried out in the presence of inorganic or organic acid (e.g. hydrochloric acid, sulfuric acid, acetic acid, trifluoroacetic acid), or inorganic or organic base (e.g. sodium hydroxide). The reaction of this process is usually carried out in a solvent which does not adversely influence the reaction such as water, methanol, ethanol, propanol, acetic acid, at a temperature range of cooling to heating. Process 5 : Compound (III) → Compound (Ig) Process 6 : Compound (IV) → Compound (Ih) The object compound (Ig) or (Ih) or salt thereof can be prepared by the compound (V) or (VI) or their reactive derivative at the carboxy group with an amine. The reactive derivative at the carboxy group of the compound (V) and (VI) may include an aryl ester thereof (e.g. p-nitrophenyl ester). The amine may include primary or secondary amine such as C₁-C₆ alkylamine, hydroxy(C₁-C₆)alkylamine, C₁-C₆ alkylthio(C₁-C₆)alkylamine, N-[hydroxy(C₁-C₆)alkyl]-(C₁-C₆)alkylamine, C₁-C₆ alkoxy(C₁-C₆)alkylamine, C₁-C₆ alkoxy(C₁-C₆)alkylamine, morpholine, piperazine, C₁-C₆ alkoxycarbonylpiperazine, C₁-C₆ alkylpiperidine, thiomorpholine, aminopiperidine, 2-oxopyrrolidinyl(C₁-C₆)alkylamine, aminomorpholine, hydroxypiperazine, hydroxy(C₁-C₆)alkylpyrrolidine, C₁-C₆ alkoxy(C₁-C₆)alkylpyrrolidine. This reaction is usually carried out in a solvent which does not adversely influence the reaction such as dichloromethane, chloroform, dimethylsulfoxide. The reaction temperature is not critical and the reaction can be carried out under heating to under cooling. Process 7 : The compound (Ij) or salt thereof can be prepared by subjecting the compound (Ii) or salt thereof to ozonolysis and then reducing the resultant compound. The ozonolysis can be carried out in a conventional manner. The reduction can be carried out by using a conventional reducing agent such as alkali metal borohydride (e.g. sodium borohydride). These reaction is usually carried out in a solvent which does not adversely influence the reaction such as methanol, dichloromethane, chloroform, dimethylsulfoxide. The reaction temperature is usually carried out under cooling. Process 8 : The compound (Ik) or salt thereof can be prepared by subjecting the compound (Ii) or salt thereof to ozonolysis and then treating the resultant compound with methyl sulfide and then reacting the resultant compound with the compound (VII). The ozonolysis and subsequent treatment with methyl sulfide can be carried out in a conventional manner. These reaction can be carried out in a solvent which does not adversely influence the reaction such as dichloromethane under cooling. The last reaction is usually carried out in a solvent which does not adversely influence the reaction under heating to under cooling. Process 9 : The compound (Im) can be prepared by oxiding the compound (Iℓ). The oxidation is usually carried out by using a conventional oxidizing agent (e.g. sodium periodide, haloperbenzoic acid ) in a solvent which does not adversely influence the reaction such as water, dioxane, dichloromethane, methanol under cooling. Process 10 : The compound (Io) or salt thereof can be carried out by subjecting the compound (In) or salt thereof to the catalytic reduction. The catalytic reduction can be carried out by using a conventional catalyst (e.g. PtO₂) in a solvent which does not adversely influence the reaction, such as ethyl acetate, at ambient temperature. Process 11 : The compound (Iq) can be prepared by reducing the compound (Ip). The reduction is usually carried out by using a conventional reducing agent such as alkali metal borohydride (e.g. sodium borohydride) in a solvent which does not adversely influence the reaction such as water, methanol, dimethylformamide under cooling to heating. Process 12 : The compound (Ir) can be prepared by reacting the compound (Ij) with an alkylating agent. The alkylating agent may include ar(C₁-C₆)alkyl halide (e.g. benzyl bromide ) and C₁-C₆ alkyl halo(C₁-C₆)alkanate (e.g. ethyl bromoacetate). This reaction is usually carried out in a solvent such as toluene, dimethylformamide under mild conditions. Process 13 : Compound (Ij) → Compound (Is) Process 14 : Compound (It)→ Compound (Iu) The compound (Is), (Iu) or salt thereof can be prepared by reacting the compound (Ij), (It) or salt thereof with an acylating agent. The acylating agent is represented by the formula : R⁸OH (VIII) wherein R⁸ is acyl or reactive derivative thereof or salt thereof. The reactive derivative of the compound (VIII) is the same as those exemplified in the explanation of that of the compound (III). This acylation is carried out under the same condition as that of Process 1. Process 15 : The compound (Iw) can be prepared by reacting the compound (Iv) or reactive derivative at the carboxy group with C₁-C₆ alkylamine. The C₁-C₆ alkylamine may include methylamine, ethylamine, propylamine. The reactive derivative of the compound (Iv) may include acid halide. The reaction conditions of this process is the same as those of Process 1. The object compound of the above processes can be isolated and purified in a conventional manner. The object compound (I) of this invention has an angiogenesis inhibitory activity and therefore is useful for the treatment of solid tumor, rheumatoid arthritis, diabetic retinopathy, psoriasis. The following test is given for the purpose of illustrating angiogenesis inhibitory activity of the object compound (I). Test effect of the object compound (I) on endothelial cell growth Endothelial cells from human umbilical vein (HUVEC) were used for this experiment. HUVEC (2 x 10³ cells per well) were plated on 96 wells microtiter plates previously coated with human fibronectin and incubated with MCDB 151 [GIBCO] medium supplemented with 15% FBS (fetal bovine serum), 100% µg/ml ECGS (Endothelial cell growth supplement), 10 µg/ml heparin in the presence of the test compound at 37°C under 5% CO₂ in the air for 5 days. At the end of the experiments, the growth rate of HUVEC was measured according to the MTT method [Cancer treatment Reports 71 , 1141∼1149 (1987)]. The test compound inhibited the proliferation of human umbilical endothelial cells. IC₅₀ values [50% inhibition doses of the test compound to endothelial cell growth) of the test compound were graphically determined and are shown in the following table. The object compound (I) of this invention in admixture with pharmaceutically acceptable carriers can orally or parenterally be administered as antitumor agent to mammals including human being in a form of a pharmaceutical composition such as capsules, tablets, granules, powders, buccal tablets, sublingual tablets, and solutions. The pharmaceutically acceptable carriers may include various organic or inorganic carrier materials, which are conventionally used for pharmaceutical purpose, such as excipient (e.g. sucrose, starch, mannit, sorbit, lactose, glucose, cellulose, talc, calcium phosphate, calcium carbonate), binding agent (cellulose, methyl cellulose, hydroxypropylcellulose, polypropylpyrrolidone, gelatin, gum arabic, polyethyleneglycol, sucrose, starch), disentegrator (e.g. starch, carboxymethyl cellulose, calcium salt of carboxymethyl cellulose, hydroxypropyl-starch, sodium glycole-starch, sodium bicarbonate, calcium phosphate, calcium citrate), lubricant (e.g. magnesium stearate aerosil, talc, sodium laurylsulfate), flavoring agent (e.g. citric acid, mentol, glycine, organge powders), preservative (sodium benzoate, sodium bisulfite, methylparaben, propylparaben), stabilizer (citric acid, sodium citrate, acetic acid), suspending agent (e.g. methyl cellulose, polyvinylpyrrolidone, aluminum stearate), dispersing agent [e.g. surface active agent], aqueous diluting agent (e.g. water), oils (e.g. sesame oil), base wax (e.g. cacao butter, polyethyleneglycol, white petrolatum). A dosage of the object compound (I) is to be varied depending on various factors such as kind of diseases, weight and/or age of a patient, and further the kind of administration route. The preferred dosage of the object compound (I) is usually selected from a dose range of 0.01-10 mg/kg/day in the case of injection and 0.5-50 mg/kg/day in the case of oral administration. The following Examples are given for the purpose of illustrating this invention. Example 1 To a solution of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.8 mg) in freshly distilled tetrahydrofuran (0.5 ml) was added sodium hydride (2.5 mg) in one portion at 5°C. The mixture was stirred for half an hour at the same temperature and then methyl isocyanate (6 µℓ) was added thereto. After stirring at ambient temperature for 1.5 hours, the mixture was treated with methyl isocyanate (6 µℓ) to complete the reaction. The reaction mixture was stirred for 3.25 hours at ambient temperature and diluted with diethyl ether. The organic layer was washed with brine, dried, and concentrated to give a crude oil which was purified by preparative thin layer column chromatography to yield 6-methylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (11 mg) as crystals. mp : 92-93°C IR (CHCl₃) : 3460, 3360, 1715 cm⁻¹ NMR (CDCl₃, δ) : 1.0-1.15 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.73 (3H, s), 1.65-2.54 (6H, m), 2.54 (1H, d, J=5Hz), 2.55 (1H, t, J=6Hz), 2.79 (3H, d, J=5Hz), 2.97 (1H, d, J=5Hz), 3.47 (3H, s), 3.64 (1H, dd, J=11Hz and 3Hz), 4.75 (1H, br s), 5.20 (1H, t, J=8Hz), 5.50 (1H, br s) Example 2 : The following compounds were prepared in a similar manner to that of Example 1. (1) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-phenylcarbamoyloxy-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1720, 1600, 1520, 1440, 1380, 1200, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.16 (1H, m), 1.24 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.74-2.50 (6H, m), 2.58 (1H, d, J=4Hz), 2.62 (1H, t, J=7Hz), 3.01 (1H, d, J=4Hz), 3.48 (3H, s), 3.72 (1H, dd, J=10Hz and 3Hz), 5.22 (1H, m), 5.56 (1H, m), 6.80 (1H, s), 7.05-7.45 (5H, m) (2) 6-Ethylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 65°C IR (CHCl₃) : 3450, 1705 cm⁻¹ NMR (CDCl₃, δ) : 0.99-1.30 (1H, m), 1.14 (3H, t, J=8Hz), 1.22 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.78-2.48 (6H, m), 2.56 (1H, d, J=4Hz), 2.58 (1H, t, J=5Hz), 2.99 (1H, d, J=4Hz), 3.22 (2H, m), 3.45 (3H, s), 3.64 (1H, dd, J=2Hz and 12Hz), 4.75 (1H, br s), 5.21 (1H, t, J=7Hz), 5.50 (1H, br s) (3) 6-Isopropylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3430, 1700 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.23 (1H, m), 1.17 (6H, d, J=6Hz), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.78-2.48 (6H, m), 2.54 (1H, d, J=4Hz), 2.57 (1H, t, J=5Hz), 2.98 (1H, d, J=4Hz), 3.45 (3H, s), 3.65 (1H, dd, J=2Hz and 12Hz), 3.80 (1H, m), 4.61 (1H, d, J=7Hz), 5.21 (1H, t, J=7Hz), 5.48 (1H, s) (4) 6-Cyclohexylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 61°C IR (CHCl₃) : 3440, 1700 cm⁻¹ NMR (CDCl₃, δ) : 0.99-2.49 (18H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=5Hz), 2.97 (1H, d, J=4Hz), 3.45 (3H, s), 3.65 (1H, dd, J=2Hz and 12Hz), 4.69 (1H, d, J=8Hz), 5.22 (1H, t, J=7Hz), 5.46 (1H, s) (5) 6-(4-Chlorophenylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 63-66°C IR (CHCl₃) : 3430, 1720 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.18 (1H, m), 1.24 (3H, s), 1.68 (3H, s), 1.76 (3H, s), 1.83-2.50 (6H, m), 2.58 (1H, d, J=4Hz), 2.61 (1H, t, J=5Hz), 3.01 (1H, d, J=4Hz), 3.47 (3H, s), 3.72 (1H, dd, J=2Hz and 12Hz), 5.22(1H, t, J=7Hz), 5.58 (1H, br s), 6.88 (1H, br s), 7.21-7.42 (4H, m) (6) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(trichloroacetylcarbamoyloxy)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3400, 1800, 1740 cm⁻¹ NMR (CDCl₃, δ) : 1.10-1.20 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.85-2.49 (6H, m), 2.58 (1H, d, J=4Hz), 2.62 (1H, t, J=5Hz), 3.00 (1H, d, J=4Hz), 3.50 (3H, s), 3.74 (1H, dd, J=12Hz and 2Hz), 5.19 (1H, t, J=7Hz), 5.68 (1H, br s), 8.87 (1H, br s) (7) 6-Propylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 87-88°C IR (CHCl₃) : 3450, 1705, 1510, 1230, 1125, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.93 (3H, t, J=8Hz), 1.00-1.13 (1H, m), 1.21 (3H, s), 1.52 (2H, m), 1.68 (3H, s), 1.75 (3H, s), 1.80-2.48 (6H, m), 2.52 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 3.14 (2H, q, J=7Hz), 3,46 (3H, s), 3.65 (1H, dd, J=3Hz and 11Hz), 4.80 (1H, br s), 5.20 (1H, br t, J=7Hz), 5.45 (1H, br s) (8) 6-(Butylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 68-69°C IR (CHCl₃) : 3450, 1710, 1510, 1240, 1130, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.93 (3H, t, J=8Hz), 1.00-1.12 (1H, m), 1.22 (3H, s), 1.22-1.58 (4H, m), 1.57 (3H, s), 1.75 (3H, s), 1.75-2.45 (6H, m), 2.52 (1H, d, J=4Hz), 2.54 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.14 (2H, q, J=7Hz), 3.45 (3H, s), 3.63 (1H, dd, J=3Hz and 11Hz), 4.75 (1H, br s), 5.19 (1H, br t, J=7Hz), 5.50 (1H, br s) (9) 6-Ethylthiocarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 83-84°C IR (Nujol) : 3300, 1535, 1190 cm⁻¹ NMR (CDCl₃, δ) : 0.98-1.14 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.22 (3H, t, J=6Hz), 1.78-2.50 (6H, m), 2.56 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 2.99 (1H, d, J=4Hz), 3.45 (3H, s), 3.56 (2H, qd, J=5Hz and 6Hz), 3.72 (1H, dd, J=2Hz and 12Hz), 5.21 (1H, br t, J=7Hz), 6.12 (1H, br s), 6.38-6.51 (1H, br s) Example 3 A solution of 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(trichloroacetylcarbamoyloxy)-1-oxaspiro[2,5]octane (26 mg) and triethylamine (9.9 µℓ) in a mixture of water (0.8 ml) and ethanol (0.8 ml) was stirred overnight at ambient temperature. The mixture was diluted with diethyl ether and washed with brine. The mixture was dried and evaporated to yield 6-carbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (18.2 mg) as white solids. mp : 125-126°C IR (CHCl₃) : 3300, 1720 cm⁻¹ NMR (CDCl₃, δ) : 1.10-1.20 (2H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.85-2.48 (7H, m), 2.58 (1H, d, J=4Hz), 2.62 (1H, t, J=5Hz), 3.00 (1H, d, J=4Hz), 3.50 (3H, s), 3.74 (1H, dd, J=12Hz and 2Hz), 4.91 (1H, br s), 5.20 (1H, t, J=7Hz), 5.45 (1H, br s) Example 4 To a solution of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.1 mg) in freshly distilled tetrahydrofuran (0.5 ml) was added sodium hydride (2.0 mg, 60% oil dispersion) in one portion at 5°C. The mixture was stirred for half an hour at the same temperature and then morpholinocarbonyl chloride (6.8 mg) was added thereto. The reaction mixture was stirred for 2 hours at ambient temperature and diluted with diethyl ether (2 ml). The organic layer was washed with water, dried and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (elution by diethyl ether/n-hexane = 2/1) to yield 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (9.7 mg) as an oil. IR (CHCl₃) : 1690, 1430, 1205 cm⁻¹ NMR (CDCl₃, δ) : 1.05-1.17 (1H, m), 1.20 (3H, s), 1.57 (3H, s), 1.73 (3H, s), 1.79-2.46 (6H, m), 2.54 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.47 (3H, s), 3.36-3.58 and 3.58-3.75 (9H, m), 5.22 (1H, m), 5.58 (1H, m) Example 5 The following compounds were prepared in a similar manner to that of Example 4. (1) 6-Cinnamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1700, 1635, 1445, 1310, 1170 cm⁻¹ NMR (CDCl₃, δ) : 1.06-1.20 (1H, m), 1.25 (3H, s), 1.58 (3H, s), 1.76 (3H, s), 1.85-2.50 (6H, m), 2.48 (1H, d, J=4Hz), 2.62 (1H, t, J=6Hz), 3.02 (1H, d, J=4Hz), 3.48 (3H, s), 3.72 (1H, dd, J=10Hz and 3Hz), 5.22 (1H, m), 5.77 (1H, m), 6.50 (1H, d, J=15Hz), 7.33-7.58 (5H, m), 7.68 (1H, d, J=15Hz) (2) 6-Cyclohexanoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1720, 1405, 1375, 1170, 1130, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.14 (1H, m), 1.20 (3H, s), 1.20-2.25 (15H, m), 1.65 (3H, s), 1.72 (3H, s), 2.25-2.47 (2H, m), 2.55 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 2.98 (1H, d, J=4Hz), 3.40 (3H, s), 3.63 (1H, dd, J=3Hz and 11Hz), 5.20 (1H, br t, J=8Hz), 5.62 (1H, m) (3) 6-Dimethylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1680, 1480, 1440, 1395, 1375, 1180 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.18 (1H, m), 1.22 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.80-2.46 (6H, m), 2.53 (1H, d, J=4Hz), 2.58 (1H, d, J=6Hz), 2.90 (6H, s), 3.00 (1H, d, J=4Hz), 3.46 (3H, s), 3.63 (1H, dd, J=3Hz and 11Hz), 5.22 (1H, t, J=8Hz), 5.57 (1H, br s) Example 6 To a solution of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.1 mg) in freshly distilled tetrahydrofuran (0.5 ml) was added sodium hydride (6.0 mg, 60% oil dispersion) in one portion at 5°C. The mixture was stirred for half an hour at the same temperature and then isobutyl chloroformate (7 mg) was added thereto. The reaction mixture was stirred for 2 hours at ambient temperature and then diluted with diethyl ether. The organic layer was washed with brine, dried, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (elution by diethyl ether/n-hexane = 1/3) to yield 6-isobutoxycarbonyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (5.1 mg) as an oil. IR (CHCl₃) : 1730, 1440, 1375, 1260, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.94 (6H, d, J=6Hz), 1.00-1.13 (1H, m), 1.20 (3H, s), 1.63 (3H, s), 1.73 (3H, s), 1.80-2.45 (7H, m), 2.52 (1H, d, J=4Hz), 2.55 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.45 (3H, s), 3.63 (1H, dd, J=7Hz and 11Hz), 3.90 (2H, m), 5.19 (1H, br t, J=8Hz), 5.45 (1H, br s) Example 7 To a solution of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.1 mg) in freshly distilled tetrahydrofuran (0.5 ml) was added sodium hydride (60% oil dispersion, 2.0 mg) in one portion in an ice bath. The suspension was stirred for half an hour at the same temperature and thereto iodomethane (71 mg) was added. After stirring for 2 hours at ambient temperature, the mixture was diluted with diethyl ether and washed with water. The organic layer was dried and evaporated to give a crude oil which was purified by column chromatography on silica gel eluted by a mixture of diethyl ether and n-hexane (1:2) to yield 5,6-dimethoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.2 mg) as an oil. IR (CHCl₃) : 1440, 1380, 1105 cm⁻¹ NMR (CDCl₃, δ) : 0.93-1.07 (1H, m), 1.20 (3H, s), 1.63 (3H, s), 1.72 (3H, s), 1.93-2.45 (6H, m), 2.51 (1H, d, J=4Hz), 2.56 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.42 (3H, s), 3.46 (3H, s), 3.59 (1H, dd, J=3Hz and 10Hz), 3.92 (1H, m), 5.19 (1H, m) Example 8 The following compounds were prepared in a similar manner to that of Example 7. (1) 6-Benzyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1450, 1380 cm⁻¹ NMR (CDCl₃, δ) : 0.95-1.10 (1H, m), 1.22 (3H, s), 1.67 (3H, s), 1.74 (3H, s), 1.55-2.48 (6H, m), 2.53 (1H, d, J=5Hz), 2.58 (1H, t, J=6Hz), 2.96 (1H, d, J=5Hz), 3.41 (3H, s), 3.58 (1H, dd, J=11Hz and 2Hz), 4.10 (1H, m), 4.70 (2H, ABq, J=12Hz), 5.22 (1H, t, J=7.5Hz), 7.28-7.45 (5H, m) (2) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(2-pyridylmethoxy)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1590, 1430, 1370, 1105 cm⁻¹ NMR (CDCl₃, δ) : 0.96-1.10 (1H, m), 1.23 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 2.01-2.46 (6H, m), 2.52 (1H, d, J=4Hz), 2.60 (1H, t, J=7Hz), 3.97 (1H, d, J=4Hz), 3.43 (3H, s), 3.62 (1H, dd, J=3Hz and 10Hz), 4.18 (1H, m), 4.75 (1H, d, J=13Hz), 4.85 (1H, d, J=13Hz), 5.22 (1H, m), 7.16 (1H, m), 7.55-7.72 (2H, m), 8.52 (1H, m) (3) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(2-quinolylmethoxy)-1-oxaspiro[2,5]octane. mp : 82-83°C IR (CHCl₃) : 1420, 1375, 1200, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.97-1.12 (1H, m), 1.22 (3H, s), 1.68 (3H, s), 1.75 (3H, s), 2.02-2.48 (6H, m), 2.55 (1H, d, J=4Hz), 2.62 (1H, t, J=6Hz), 2.99 (1H, d, J=4Hz), 3.45 (3H, s), 3.65 (1H, dd, J=3Hz and 11Hz), 4.22 (1H, br s), 4.98 (2H, s), 5.24 (1H, m), 7.53 (1H, t, J=8Hz), 7.72 (1H, t, J=8Hz), 7.80 (1H, d, J=8Hz), 7.84 (1H, d, J=8Hz), 8.05 (1H, d, J=8Hz), 8.18 (1H, d, J=8Hz) (4) 6-(4-Chlorobenzyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1680, 1485, 1440, 1380, 1200 cm⁻¹ NMR (CDCl₃, δ) : 0.95-1.10 (1H, m), 1.21 (3H, s), 1.68 (3H, s), 1.74 (3H, s), 1.90-2.46 (6H, m), 2.52 (1H, d, J=4Hz), 2.56 (1H, t, J=6Hz), 2.96 (1H, d, J=4Hz), 3.41 (3H, s), 3.58 (1H, dd, J=3Hz and 10Hz), 4.08 (1H, br s), 4.60 (1H, d, J=10Hz), 4.71 (1H, d, J=10Hz), 5.20 (1H, br t, J=5Hz), 7.30 (4H, s) (5) 5-Methoxy-6-(4-methoxybenzyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1605, 1505, 1440, 1375, 1300, 1240, 1205 cm⁻¹ NMR (CDCl₃, δ) : 0.91-1.08 (1H, m), 1.20 (3H, s), 1.62 (3H, s), 1.72 (3H, s), 1.88-2.44 (6H, m), 2.49 (1H, d, J=4Hz), 2.53 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.38 (3H, s), 3.56 (1H, dd, J=3Hz and 10Hz), 3.32 (3H, s), 4.07 (1H, br s), 4.55 (1H, d, J=11Hz), 4.65 (1H, d, J=11Hz), 5.20 (1H, br t, J=5Hz), 6.86 (2H, d, J=6Hz), 7.30 (2H, d, J=6Hz) (6) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(2-naphthylmethoxy)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1440, 1370, 1220, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.95-1.08 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.92-2.45 (6H, m), 2.52 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.42 (3H, s), 3.59 (1H, dd, J=3Hz and 10Hz), 4.14 (1H, br t, J=8Hz), 4.78 (1H, d, J=13Hz), 4.88 (1H, d, J=13Hz), 7.35-7.66 (3H, m), 7.75-7.90 (4H, m) (7) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(1-naphthylmethoxy)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1370, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.88-1.04 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.72 (3H, s), 1.82-2.47 (6H, m), 2.49 (1H, d, J=4Hz), 2.58 (1H, t, J=5Hz), 2.93 (1H, d, J=4Hz), 3.42 (3H, s), 3.60 (1H, dd, J=2Hz and 12Hz), 4.22 (1H, br s), 5.03 (1H, d, J=12Hz), 5.22 (1H, br t, J=7Hz), 5.30 (1H, d, J=12Hz), 7.32-7.60 (4H, m), 7.22-7.90 (2H, m), 8.18-8.27 (1H, m) (8) 6-Ethoxycarbonylmethoxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1740, 1440, 1380, 1130 cm⁻¹ NMR (CDCl₃, δ) : 0.95-1.10 (1H, m), 1.22 (3H, s), 1.28 (3H, t, J=7Hz), 1.66 (3H, s), 1.72 (3H, s), 2.02-2.48 (6H, m), 2.52 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.48 (3H, s), 3.60 (1H, dd, J=10Hz and 3Hz), 4.20 (3H, m), 4.25 (1H, d, J=16Hz), 4.48 (1H, d, J=16Hz), 5.20 (1H, m) Example 9 A mixture of 6-ethoxycarbonylmethoxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxasprio[2,5]octane (17 mg) and 1N aqueous sodium hydroxide solution (0.09 ml) in ethanol (0.2 ml) was stirred for one hour at ambient temperature. The solution was neutralized with 1N hydrochloric acid and the separated oil was extracted with diethyl ether. The solvent was dried and concentrated in vacuo to yield 6-carboxymethoxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (14.4 mg) as an oil. IR (CHCl₃) : 3400, 1760, 1440, 1370, 1120 cm⁻¹ NMR (CDCl₃, δ) : 0.96-1.10 (1H, m), 1.22 (3H, s), 1.65 (3H, s), 1.72 (3H, s), 1.77-2.46 (6H, m), 2.46 (1H, d, J=4Hz), 2.62 (1H, t, J=6Hz), 2.95 (1H, d, J=4Hz), 3.56 (3H, s), 3.70 (1H, dd, J=10Hz and 3Hz), 3.95 (1H, m), 4.02 (1H, d, J=16Hz), 5.20 (1H, m), 5.80 (1H, br s) Example 10 To a mixture of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (423 mg) and pyridine (474 mg) in dichloromethane (9 ml) was added portionwise 4-nitrophenyl chloroformate (1.2 g) at ambient temperature. After stirring for 3 hours, 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(4-nitrophenoxycarbonyloxy)-1-oxaspiro[2,5]octane was prepared in the reaction mixture. To the mixture 3-amino-1-propanol (2.25 g) was added in one portion. The mixture was stirred for 2 hours at ambient temperature and then diluted with diethyl ether (20 ml). The solution was washed with brine, 1N aqueous hydrochloric acid, 1N aqueous sodium hydroxide, and brine successively. The solvent was dried and evaporated in vacuo to give a crude oil, which was purified by column chromatography on silica gel eluted by ethyl acetate to yield 6-(3-hydroxypropylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (400 mg) as crystals. mp : 56-58°C IR (Nujol) : 3350, 1680, 1530, 1260 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.13 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.73 (3H, s), 1.65-2.50 (10H, m), 2.52-2.61 (2H, m), 2.98 (1H, d, J=4Hz), 3.20-3.45 (1H, m), 3.48 (3H, s), 3.58-3.75 (4H, m), 5.20 (1H, br t, J=8Hz), 5.50 (1H, br s) Example 11 To a mixture of 6-(3-hydroxypropylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (15 mg) and pyridine (12.3 mg) in dichloromethane (1 ml) was added portionwise 4-nitrophenyl chloroformate (32 mg) at ambient temperature. After stirring for 2 hours, 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(4-nitrophenoxycarbonyloxypropylcarbamoyloxy)-1-oxaspiro[2,5]octane was prepared in the reaction mixture. To the mixture, 30% methanol solution of methylamine (7 mg) was added in one portion. The mixture was stirred for 1 hour at ambient temperature and diluted with diethyl ether (5 ml). The solution was washed with brine, 1N aqueous hydrochloric acid, 1N aqueous sodium hydroxide, and brine successively. The solvent was dried and evaporated in vacuo to give a crude oil, which was purified by column chromatography on silica gel eluted by diethyl ether to yield 5-methoxy-4-[2-methyl-3-[3-methyl-2-butenyl)oxiranyl]-6-[3-(methylcarbamoyloxy)propylcarbamoyloxy]-1-oxaspiro[2,5]octane (13.8 mg) as crystals. mp : 52-54°C IR (Nujol) : 3350, 1700, 1525, 1460, 1110 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.12 (1H, m), 1.71 (3H, s), 1.78 (3H, s), 1.80 (3H, s), 1.81-2.48 (9H, m), 2.50-2.62 (2H, m), 2.97 (3H, d, J=4Hz), 2.98 (1H, d, J=4Hz), 3.10-3.38 (2H, m), 3.45 (3H, s), 3.64 (1H, dd, J=3Hz and 11Hz), 4.02-4.38 (2H, m), 4.93-5.13 (1H, m), 5.13-5.25 (1H, m), 5.50 (1H, br s) Example 12 To a mixture of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (9.2 g) and pyridine (10.3 g) in dichloromethane (92 ml) was added portionwise 4-nitrophenyl chloroformate (13.1 g) at ambient temperature. After stirring for 3 hours, 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(4-nitrophenoxycarbonyloxy)-1-oxaspiro[2,5]octane was prepared in the reaction mixture. To the mixture morpholine (28.4 g) was added in one portion. The solution was stirred for 8 hours at ambient temperature and then diluted with diethyl ether (300 ml). The solution was washed with brine, 1N aqueous hydrochloric acid, 1N aqueous sodium hydroxide and brine successively. The solvent was dried and evaporated in vacuo to give 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-morpholinocarbonyloxy-1-oxaspiro[2,5]octane (13.1 g) as an oil. IR (CHCl₃) : 1690, 1430, 1205 cm⁻¹ NMR (CDCl₃, δ) : 1.05-1.17 (1H, m), 1.20 (3H, s), 1.57 (3h, s), 1.73 (3H, s), 1.79-2.46 (6H, m), 2.54 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.47 (3H, s), 3.36-3.58 and 3.58-3.75 (9H, m), 5.22 (1H, m), 5.58 (1H, m) Example 13 The following compounds were prepared in a similar manner to that of Example 12. (1) 5-Methoxy-4-[2-methyl-3-(3-phenyl-2-propenyl)oxiranyl]-6-methylcarbamoyloxy-1-oxaspiro[2,5]octane mp : 45°C IR (CHCl₃) : 3450, 1705 cm⁻¹ NMR (CDCl₃, δ) : 0.98-1.13 (1H, m), 1.26 (3H, s), 1.78-2.15 (4H, m), 2.43-2.64 (2H, m), 2.56 (1H, d, J=4Hz), 2.72 (1H, t, J=6Hz), 2.78 (3H, d, J=5Hz), 2.95 (1H, d, J=4Hz), 3.47 (3H, s), 3.66 (1H, dd, J=12 and 3Hz), 4.66-4.83 (1H, br s), 5.46-5.56 (1H, br s), 6.24 (1H, dt, J=16 and 7Hz), 6.56 (1H, d, J=16Hz), 7.19-7.41 (5H, m) (2) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(3-methylthiopropylcarbamoyloxy)-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1705 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.16 (1H, m), 1.23 (3H, s), 1.68 (3H, s), 1.76 (3H, s), 1.72-2.48 (8H, m), 2.13 (3H, s), 2.48-2.65 (4H, m), 3.00 (1H, d, J=4Hz), 3.30 (2H, dt, J=7Hz), 3.47 (3H, s), 3.66 (1H, dd, J=12 and 2Hz), 4.81-4.97 (1H, m), 5.22 (1H, br t, J=7Hz), 5.44-5.56 (1H, br s) (3) 6-(4-Ethoxycarbonylpiperazinocarbonyloxy)-5-methyl-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 88-89°C IR (Nujol) : 1690, 1230 cm⁻¹ NMR (CDCl₃, δ) : 1.05-1.18 (1H, m), 1.22 (3H, s), 1.28 (3H, t, J=7Hz), 1.66 (3H, s), 1.75 (3H, s), 1.78-2.13 (4H, m), 2.20 (1H, br t) J=7Hz), 2.26-2.48 (1H, m), 2.56 (1H, d, J=4Hz), 2.57 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.47 (3H, s), 3.38-3.60 (8H, br s), 3.65 (1H, dd, J=2Hz and 12Hz), 4.16 (2H, q, J=7Hz), 5.20 (1H, br t, J=7Hz), 5.58 (1H, br s) (4) 6-(N-Hydroxyethyl-N-methylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1680 cm⁻¹ NMR (CDCl₃) : 1.02-1.16 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.80-2.25 (5H, m), 2.27-2.48 (1H, m), 2.55 (1H, d, J=4Hz), 2.58 (1H, t, J=5Hz), 2.66-2.95 (1H, br), 2.96 (3H, s), 2.98 (1H, d, J=4Hz), 3.45 (3H, s), 3.40-3.48 (2H, br s), 3.64 (1H, dd, J=12, 2Hz), 3.69-3.83 (2H, m), 5.20 (1H, br t, J=7Hz), 5.46-5.62 (1H, br s) Example 14 To a mixture of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (26 mg), pyridine (44 µl), and 4-dimethylaminopyridine (2 mg) in dichloromethane (0.8 ml) was added dropwise 4-nitrophenyl chloroformate (20 mg) at ambient temperature. After stirring for 2 hours, piperidine (40 µl) was added in one portion. The solution was stirred overnight at ambient temperature and then diluted with diethyl ether (20 ml). The mixture was washed with brine, aqueous saturated sodium bicarbonate solution, and brine successively. The mixture was dried and evaporated under reduced pressure to give a crude oil, which was purified by preparative thin layer chromatography to yield 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-piperidinocarbonyloxy-1-oxaspiro[2,5]octane (34.3 mg). Oil IR (CHCl₃) : 1680 cm⁻¹ NMR (CDCl₃, δ) : 1.03-1.16 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.74 (3H, s), 1.46-2.46 (12H, m), 2.52 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 2.99 (1H, d, J=4Hz), 3.33-3.53 (4H, m), 3.46 (3H, s), 3.64 (1H, dd, J=2Hz and 12Hz), 5.21 (1H, br t, J=8Hz), 5.55 (1H, br s) Example 15 The following compounds were prepared in a similar manner to that of Example 14. (1) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)-oxiranyl-6-(4-methylpiperidinocarbonyloxy)-1-oxaspiro[2,5]octane Oil IR (CHCl₃) : 1680 cm⁻¹ NMR (CDCl₃) : 0.94 (3H, d, J=7Hz), 1.00-1.36 (3H, m), 1.22 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.40-2.48 (9H, m), 2.54 (1H, d, J=4Hz), 2.58 (1H, t, J=7Hz), 2.63-2.92 (2H, m), 3.00 (1H, d, J=4Hz), 3.45 (3H, s), 3.64 (1H, dd, J=2Hz and 12Hz), 3.87-4.30 (2H, m), 5.20 (1H, t, J=7Hz), 5.55 (1H, br s) (2) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)-oxiranyl]-6-thiomorpholinocarbonyloxy-1-oxaspiro[2,5]octane. mp : 71-72°C IR (Nujol) : 1690, 1200, 1110 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.17 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.74 (3H, s), 1.78-2.27 (5H, m), 2.28-2.46 (1H, m), 2.46-2.75 (6H, m), 3.00 (1H, d, J=4Hz), 3.45 (3H, s), 3.65 (1H, dd, J=2Hz and 12Hz), 3.63-3.83 (4H, m), 5.21 (1H, br t, J=7Hz), 5.56 (1H, br s) (3) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-piperidinocarbamoyloxy-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1680 cm⁻¹ NMR (CDCl₃, δ) : 1.03-1.16 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.80-2.48 (6H, m), 1.43-1.70 (6H, m), 2.54 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.30-3.53 (4H, m), 3.46 (3H, s), 3.65 (1H, dd, J=2Hz and 12Hz), 5.21 (1H, br t, J=7Hz), 5.55 (1H, br s) (4) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-[3-(2-oxopyrrolidin-1-yl)propylcarbamoyloxy]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1700, 1660 cm⁻¹ NMR (CDCl₃, δ) : 0.97-1.14 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.63-2.26 (9H, m), 2.27-2.49 (3H, m), 2.52 (1H, d, J=4Hz), 2.57 (1H, t, J=5Hz), 2.98 (1H, d, J=4Hz), 3.06-3.26 (2H, m), 3.30-3.52 (4H, m), 3.47 (3H, s), 3.63 (1H, dd, J=2Hz and 12Hz), 5.21 (1H, br t, J=7Hz), 5.46-5.65 (2H, m) (5) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-morpholinocarbamoyloxy-1-oxasprio[2,5]octane. mp : 122-123°C IR (Nujol) : 3250, 1700, 1525, 1250, 1150, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.16 (1H, m), 1.22 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.78-2.48 (6H, m), 2.55 (1H, d, J=4Hz), 2.56 (1H, t, J=6Hz), 2.76-2.93 (4H, br t, J=5Hz), 3.64 (1H, dd, J=12 and 2Hz), 3.45 (3H, s), 3.73-3.86 (4H, br t, J=5Hz), 5.20 (1H, br t, J=7Hz), 5.52 (1H, br s), 5.74 (1H, br s) (6) 5-Methoxy-6-(2-methoxyethylcarbamoyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1700, 1510, 1440, 1380, 1200 cm⁻¹ NMR (CDCl₃, δ) : 0.96-1.12 (1H, m), 1.22 (3H, s), 1.68 (3H, s), 1.75 (3H, s), 1.77-2.48 (6H, m), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=8Hz), 2.98 (1H, d, J=4Hz), 3.28-3.41 (2H, m), 3.38 (3H, s), 3.41-3.52 (2H, m), 3.45 (3H, s), 3.64 (1H, dd, J=3Hz and 12Hz), 5.05-5.28 (2H, m), 5.50 (1H, br s) (7) 6-(4-Hydroxypiperidinocarbonyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3530, 1720, 1110 cm⁻¹ NMR (CDCl₃) : 1.02-1.16 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.40-2.47 (11H, m), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.02-3.22 (2H, m), 3.45 (3H, s), 3.64 (1H, dd, J=2Hz and 12Hz), 3.74-3.99 (3H, m), 5.20 (1H, br t, J=7Hz), 5.56 (1H, br s) (8) 6-(2-Hydroxymethylpyrrolidinocarbonyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (Neat) : 3450, 1680, 1420, 1105 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.16 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.75-2.48 (1H, m), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=6Hz), 2.98 (1H, d, J=4Hz), 3.35-3.80 (8H, m), 3.90-4.04 (1H, m), 5.20 (1H, br t, J=8Hz), 5.60 (1H, br s) (9) 5-Methoxy-6-(2-methoxymethylpyrrolidinocarbonyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (Neat) : 1690, 1410, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.18 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.77-2.46 (11H, m), 2.50-2.60 (2H, m), 2.98 (1H, d, J=4Hz), 3.15-3.58 (10H, m), 3.90-4.08 (1H, m), 5.20 (1H, br t, J=8Hz), 5.60 (1H, br s) (10) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(3-methylthiopropylcarbamoyloxy)-1- oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1705 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.16 (1H, m), 1.23 (3H, s), 1.68 (3H, s), 1.76 (3H, s), 1.72-2.48 (8H, m), 2.13 (3H, s), 2.48-2.65 (4H, m), 3.00 (1H, 4Hz), 3.30 (2H, td, J=7Hz and 7Hz), 3.47 (3H, s), 3.66 (1H, dd, J=2Hz and 12Hz), 4.81-4.97 (1H, m), 5.22 (1H, br t, J=7Hz), 5.44-5.56 (1H, br s) (11) 6-(2-Hydroxyethylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 57-58°C IR (Neat) : 3355, 1710, 1525, 1250, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.06 (1H, m), 1.22 (3H, s), 1.67 (3H, s), 1.83 (3H, s), 1.85-2.48 (6H, m), 2.50-2.62 (2H, m), 2.72 (1H, br t, J=5Hz), 2.98 (1H, d, J=4Hz), 3.20-3.51 (2H, m), 3.46 (3H, s), 3.59-3.78 (3H, m), 5.11-5.35 (2H, m), 5.52 (1H, br s) (12) 5-Methoxy-6-(3-methoxypropylcarbamoyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro-[2,5]octane. mp : 55-56°C IR (CHCl₃, δ) : 3460, 1710, 1105 cm⁻¹ NMR (CDCl₃, δ) : 0.96-1.14 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.74 (3H, s), 1.68-2.46 (8H, m), 2.54 (1H, d, J=6Hz), 2.56 (1H, t, J=7Hz), 2.97 (1H, d, J=6Hz), 3.19-3.37 (2H, m), 3.33 (3H, s), 3.44 (3H, s), 3.38-3.50 (2H, m), 3.64 (1H, dd, J=14, 2Hz), 4.96-5.10 (1H, m), 5.21 (1H, br t, J=7Hz), 5.44-5.52 (1H, br s) (13) 6-[(3-Ethoxycarbonyl)propylcarbamoyloxy]-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3440, 1715, 1505 cm⁻¹ NMR (CDCl₃) : 0.99-1.14 (1H, m), 1.21 (3H, s), 1.26 (3H, t, J=7Hz), 1.65 (3H, s), 1.74 (3H, s), 1.76-2.26 (6H, m), 2.27-2.48 (4H, m), 2.55 (1H, d, J=6Hz), 2.52-2.60 (1H, m), 2.97 (1H, d, J=6Hz), 3.12-3.32 (2H, m), 3.45 (3H, s), 3.64 (1H, dd, J=14, 2Hz), 4.14 (2H, q, J=7Hz), 4.89 (1H, br s), 5.12-5.26 (1H, m), 5.50 (1H, br s) Example 16 The following compounds were prepared in a similar manner to that of Example 11. (1) 5-Methoxy-6-(4-methylcarbamoyloxypiperidinocarbonyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 44-47°C IR (Nujol) : 3350, 1720, 1690 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.16 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.47-2.25 (9H, m), 2.36-2.48 (1H, m), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=6Hz), 2.81 (3H, d, J=5Hz), 3.01 (1H, d, J=4Hz), 3.18-3.40 (2H, m), 3.46 (3H, s), 3.56-3.83 (2H, m), 3.64 (1H, dd, J=2Hz and 12Hz), 4.54-4.70 (1H, br s), 4.74-4.95 (1H, br s), 5.20 (1H, br t, J=7Hz), 5.57 (1H, br s) (2) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-[N-[2-(thiomorpholin-4-ylcarbonyloxy)ethyl]-N-methylcarbamoyloxy]-1-oxaspiro[2.5]octane. Oil IR (CHCl₃) : 1680, 1460, 1420, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.17 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.60-2.48 (6H, m), 2.50-2.75 (6H, m), 2.87-3.10 (4H, m), 3.46 (3H, s), 3.52-3.86 (7H, m), 4.15-4.34 (2H, m), 5.20 (1H, br t, J=7Hz), 5.56 (1H, br s) (3) 6-[3-(N-Hydroxyethyl-N-methylcarbamoyloxy)propylcarbamoyloxy]-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1680 cm⁻¹ NMR (CDCl₃, δ) : 0.81-0.96 (2H, m), 0.97-1.13 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.73 (3H, s), 1.68-2.25 (7H, m), 2.26-2.48 (1H, m), 2.54 (1H, d, J=4Hz), 2.56 (1H, t, J=6Hz), 2.97 (4H, s), 3.16-3.40 (2H, m), 3.43 (3H, s), 3.40-3.52 (2H, m), 3.64 (1H, dd, J=12, 2Hz), 3.68-3.85 (2H, br s), 4.19 (2H, t, J=6Hz), 5.20 (1H, br t, J=7Hz), 5.32-5.55 (1H, m) (4) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-[3-morpholinocarbonyloxy)propylcarbamoyloxy]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1690 cm⁻¹ NMR (CDCl₃, δ) : 0.98-1.13 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.72-2.26 (7H, m), 2.27-2.48 (1H, m), 2.54 (1H, d, J=4Hz), 2.56 (1H, t, J=5Hz), 2.98 (1H, d, J=4Hz), 3.15-3.36 (2H, m), 3.44 (3H, s), 3.42-3.52 (4H, m), 3.56-3.72 (5H, m), 4.17 (2H, t, J=7Hz), 4.98 (1H, br t, J=7Hz), 5.20 (1H, br t, J=7Hz), 5.49 (1H, br s) (5) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-[2-(methylcarbamoyloxy)ethylcarbamoyloxy]-1-oxaspiro[2,5]octane. Oil IR (Neat) : 3350, 1710, 1530, 1250 cm⁻¹ NMR (CDCl₃, δ) : 0.98-1.15 (1H, m), 1.21 (3H, s), 1.64 (3H, s), 1.75 (3H, s), 1.75-2.45 (6H, m), 2.50-2.61 (2H, m), 2.78 (3H, d, J=5Hz), 2.96 (1H, d, J=4Hz), 3.40 (2H, m), 3.45 (3H, s), 3.62 (1H, dd, J=11 and 3Hz), 4.15 (2H, br t, J=5Hz), 4.77 (1H, br s), 5.08 (1H, br s), 5.20 (1H, t, J=7Hz), 5.48 (1H, br s) (6) 5-Methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-[4-(methylcarbamoyloxy)butylcarbamoyloxy]-1-oxaspiro[2,5]octane. Oil IR (Neat) : 3350, 1700, 1530, 1255, 1130, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.98-1.12 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.45-2.48 (10H, m), 2.49-2.61 (2H, m), 2.78 (3H, d, J=5Hz), 2.97 (1H, d, J=4Hz), 3.10-3.28 (2H, m), 3.45 (3H, s), 3.62 (1H, dd, J=15 and 3Hz), 4.00-4.13 (2H, m), 4.60-4.84 (2H, m), 5.20 (1H, br d, J=7Hz), 5.47 (1H, br s) (7) 5-Methoxy-6-(3-methylcarbamoyloxy-2-propenylcarbonyloxy)-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane Oil IR (CHCl₃) : 3460, 1715 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.16 (1H, m), 1.23 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.82-2.48 (6H, m), 2.56 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 2.86 (3H, d, J=5Hz), 3.00 (1H, d, J=4Hz), 3.44 (3H, s), 3.69 (1H, dd, J=3Hz and 12Hz), 4.70-4.90 (3H, m), 5.22 (1H, br t, J=7Hz), 5.69 (1H, br s), 6.06 (1H, d, J=16Hz), 6.95 (1H, td, J=4Hz and 16Hz) Example 17 To a solution of 6-cyclohexylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (20 mg) in a mixture of methanol (0.1 ml) and dichloromethane (5 ml) was passed through ozone at -78°C for 3 minutes. Nitrogen was bubbled into the solution at the same temperature to remove excess ozone. The solvents were evaporated and the residue was dissolved in methanol (2 ml). To the solution was added sodium borohydride (10 mg) in one portion at 5°C. The mixture was stirred at 5°C for 10 minutes and then concentrated in vacuo. The residue was dissolved in dichloromethane (20 ml), washed with brine, dried, and evaporated. The crude oil was purified by column chromatography on silica gel eluted with diethyl ether to yield 6-cyclohexylcarbamoyloxy-4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-1-oxaspiro[2,5]octane (11.6 mg). Oil IR (CHCl₃) : 3440, 1705, 1050 cm⁻¹ NMR (CDCl₃, δ) : 1.22 (3H, s), 1.00-2.15 (18H, m), 2.59 (1H, d, J=4Hz), 2.77 (1H, dd, J=5Hz and 5Hz), 2.91 (1H, d, J=4Hz), 3.46 (3H, s), 3.35-3.55 (1H, m), 3.66 (1H, dd, J=2Hz and 12Hz), 3.87 (2H, br s), 4.69 (1H, d, J=7Hz), 5.45 (1H, br s) Example 18 The following compound was prepared in a similar manner to that of Example 17. 4-[3-(2-Hydroxyethyl)-2-methyloxiranyl]-5-methoxy-6-morpholinocarbonyloxy-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3450, 1680, 1420, 1200 cm⁻¹ NMR (CDCl₃, δ) : 1.10-1.22 (1H, m), 1.20 (3H, s), 1.61-2.11 (6H, m), 2.60 (1H, d, J=4Hz), 2.80 (1H, dd, J=8 and 5Hz), 2.94 (1H, d, J=4Hz), 3.48 (3H, s), 3.35-3.55 (5H, m), 3.55-3.76 (5H, m), 3.76-3.95 (2H, m), 5.55 (1H, br s) Example 19 To a solution of 6-cyclohexylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (70 mg) in a mixture of methanol (0.1 ml) and dichloromethane (5 ml) was passed through ozone for 13 minutes at -78°C to give 6-cyclohexylcarbamoyloxy-5-methoxy-4-[2-methyl-3-formylmethyloxiranyl)-1-oxaspiro[2,5]octane in the reacting mixture. After babbling of nitrogen, methyl sulfide (0.2 ml) was added to the mixture at the same temperature. The mixture was stirred at -78°C for 15 minutes and allowed to warm to 0°C followed by the addition of carboethoxymethylene-triphenylphosphorane (150 mg). The mixture was stirred at ambient temperature for 18 hours and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluted with a mixture of diethyl ether and n-hexane (1:1) to yield 6-cyclohexylcarbamoyloxy-4-[3-(3-ethoxycarbonyl-2-propenyl)-2-methyloxiranyl]-5-methoxy-1-oxaspiro[2,5]octane (53 mg) as an oil. IR (CHCl₃) : 3450, 1705 cm⁻¹ NMR (CDCl₃, δ) : 1.01-1.17 (1H, m), 1.22 (3H, s), 1.28 (3H, t, J=7Hz), 1.19-2.14 (15H, m), 2.40-2.50 (2H, m), 2.58 (1H, d, J=4Hz), 2.71 (1H, dd, J=5Hz and 7Hz), 2.82 (1H, d, J=4Hz), 3.45 (3H, s), 3.42-3.52 (1H, m), 3.65 (1H, dd, J=2Hz and 12Hz), 4.20 (2H, q, J=7Hz), 4.66 (1H, br d, J=7Hz), 6.01 (1H, d, J=15Hz), 7.00 (1H, dt, J=6Hz and 15Hz) Example 20 To a solution of 6-(4,5-dihydroxy-2-hexenoyloxy)-5-methoxy-4-(2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (412 mg) in a mixture of methanol (4 ml) and water (4 ml) was added sodium periodate (215 mg) in several portions at 5°C. The mixture was stirred for half hour at the same temperature and diluted with diethyl ether (30 ml). The mixture was washed with brine, dried, and concentrated in vacuo to give a crude oil, which was purified by column chromatography on silica gel (elution by diethyl ether/n-hexane = 1/1) to yield 6-(3-formylacryloyloxy)-5-methoxy-4-(2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (251 mg) as an oil. IR (CHCl₃) : 1720, 1695 cm⁻¹ NMR (CDCl₃, δ) : 1.06-1.20 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.89-2.48 (6H, m), 2.58 (1H, d, J=4Hz), 2.60 (1H, t, J=5Hz), 3.02 (1H, d, J=4Hz), 3.46 (3H, s), 3.72 (1H, dd, J=2Hz and 12Hz), 5.22 (1H, br t, J=7Hz), 5.70 (1H, br s), 6.78 (1H, d, J=16Hz), 6.98 (1H, dd, J=6Hz and 16Hz), 9.78 (1H, d, J=6Hz) Example 21 To a solution of 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(thiomorpholin-4-ylcarbonyloxy)-1-oxaspiro[2,5]octane (41 mg) in 1,4-dioxane (2 ml) and water (0.2 ml) was added sodium periodate (21 mg) at ambient temperature. After stirring at the same temperature for 18 hours, the reaction mixture was diluted with diethyl ether. The precipitates were filtered off by celite and the filtrate was concentrated in vacuo. The residue was purified by column chromatography on silica gel (elution by ethyl acetate) to yield 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(1-oxothiomorpholin-4-ylcarbonyloxy)-1-oxaspiro[2,5]octane (25 mg) as an oil. IR (CHCl₃) : 1690, 1100, 900 cm⁻¹ NMR (CDCl₃, δ) : 1.08-1.20 (1H, m), 1.21 (3H, s), 1.68 (3H, s), 1.77 (3H, s), 1.72-2.29 (5H, m), 2.30-2.50 (1H, m), 2.60 (1H, d, J=4Hz), 3.02 (1H, d, J=4Hz), 2.50-3.06 (5H, m), 3.47 (3H, s), 3.66 (1H, dd, J=12, 2Hz), 3.82-4.18 (4H, m), 5.21 (1H, br t, J=7Hz), 5.65 (1H, br s). Example 22 To a solution of 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(thiomorpholin-4-ylcarbonyloxy)-1-oxaspiro[2,5]octane (31 mg) in dichloromethane (2 ml) was added m-chloroperbenzoic acid (31 mg) at 0°C. After stirring at 0°C for 1 hour, the mixture was diluted with diethyl ether and washed with saturated sodium hydrogen carbonate and brine. The mixture was dried and concentrated to give a crude oil which was purified by preparative thin layer chromatography to yield 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)-1-oxaspiro[2,5]octane (9 mg) as an oil. IR (CHCl₃) : 1700, 1130 cm⁻¹ NMR (CDCl₃, δ) : 0.75-0.98 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 2.47-2.60 (1H, m), 2.56 (1H, d, J=4Hz), 3.00 (1H, d, J=4Hz), 1.06-2.45 (6H, m), 2.84-3.13 (4H, br s), 3.45 (3H, s), 3.65 (1H, dd, J=12, 2Hz), 3.72-4.26 (4H, br s), 5.20 (1H, br t, J=7Hz), 5.59 (1H, br s) Example 23 To a solution of 6-(4,5-dihydroxy-2-hexanoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (99 mg) in a mixture of methanol (2 ml) and water (2 ml) was added sodium periodate (62 mg) in one protion at 5°C. After stirring for half an hour at the same temperature, the mixture was treated with sodium borohydride (46 mg) for half an hour. The mixture was poured into ice water and the separated oil was extracted with diethyl ether. The organic layer was dried and concentrated in vacuo to give 6-(4-hydroxycrotonoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (71 mg) as an oil. IR (CHCl₃) : 3400, 1705 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.16 (1H, m), 1.22 (3H, s), 1.67 (3H, s), 1.74 (3H, s), 1.83-2.48 (6H, m), 2.56 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.44 (3H, s), 3.68 (1H, dd, J=2Hz and 12Hz), 4.31-4.48 (2H, m), 5.21 (1H, br t, J=7Hz), 5.71 (1H, br s), 6.15 (1H, d, J=16Hz), 7.04 (1H, td, J=5Hz and 16Hz) Example 24 A solution of 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-morpholinocarbonyloxy-1-oxaspiro[2,5]octane (1.23 g) in ethyl acetate (12 ml) was hydrogenated under hydrogen (1 atm) in the presence of platinum oxide (120 mg) for 1 hour. The catalyst was removed by filtration and the filtrate was concentrated in vacuo. The residue was purified by column chromatography on silica gel eluted with a mixture of diethyl ether and n-hexane (1:1, V/V) to give 5-methoxy-4-[2-methyl-3-(3-methylbutyl)oxiranyl]-6-morpholinocarbonyloxy-1-oxaspiro [2,5]octane (996 mg) as an oil, which was standing on to give crystals. mp : 64-65°C IR (Nujol) : 1700, 1240, 1115 cm⁻¹ NMR (CDCl₃, δ) : 0.90 (6H, d, J=6Hz), 1.18 (3H, s), 1.08-1.70 (6H, m), 1.80-2.12 (4H, m), 2.55 (1H, dd, J=7 and 5Hz), 2.60 (1H, d, J=4Hz), 2.88 (1H, d, J=4Hz), 3.36-3.55 (8H, m), 3.60-3.77 (4H, m), 5.58 (1H, m) Example 25 The following compounds were prepared in a similar manner to that of Example 24. (1) 6-Cyclohexylcarbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methylbutyl)oxiranyl]-1-oxaspiro[2,5]octane. IR (CHCl₃) : 3440, 1700 cm⁻¹ NMR (CDCl₃, δ) : 0.91 (6H, d, J=7Hz), 1.00-2.17 (20H, m), 1.19 (3H, s), 2.53 (1H, dd, J=4Hz and 7Hz), 2.58 (1H, d, J=4Hz), 2.88 (1H, d, J=4Hz), 3.44 (3H, s), 3.46-3.57 (1H, m), 3.64 (1H, dd, J=2Hz and 12Hz), 4.67 (1H, br d, J=7Hz), 5.45 (1H, br s) (2) 6-Carbamoyloxy-5-methoxy-4-[2-methyl-3-(3-methylbutyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 93-94°C IR (Nujol) : 3450, 3350, 3300, 3200, 1720, 1605, 1320, 1120, 1080 cm⁻¹ NMR (CDCl₃, δ) : 0.90 (6H, d, J=6Hz), 1.05-2.20 (10H, m), 1.20 (3H, s), 2.55 (1H, dd, J=7 and 5Hz), 2.62 (1H, d, J=4Hz), 2.90 (1H, d, J=4Hz), 3.45 (3H, s), 3.67 (1H, dd, J=11 and 3Hz), 4.69 (2H, br s), 5.47 (1H, m) Example 26 A solution of 6-cyclohexylcarbamoyloxy-4-[3-(3-ethoxycarbonyl-2-propenyl)-2-methyloxiranyl]-5-methoxy-1-oxaspiro[2,5]octane (46 mg) in ethyl acetate (30 ml) was hydrogenated under hydrogen (1 atm) in the presence of platinum oxide (5 mg) for 2 hours. The catalyst was removed by filtration and the filtrate was concentrated in vacuo. The residue was purified by column chromatography on silica gel eluted with a mixture of diethyl ether and n-hexane (1:1) to give 6-cyclohexylcarbamoyloxy-4-[3-(3-ethoxycarbonylpropyl)-2-methyloxiranyl]-5-methoxy-1-oxaspiro[2,5]octane as an oil. IR (CHCl₃) : 3440, 1710, 900 cm⁻¹ NMR (CDCl₃, δ) : 1.18 (3H, s), 1.26 (3H, t, J=6Hz), 1.00-1.52 (10H, m), 1.52-2.18 (9H, m), 2.28-2.52 (2H, m), 2.59 (1H, dd, J=2Hz and 5Hz), 2.60 (1H, d, J=4Hz), 2.84 (1H, d, J=4Hz), 3.45 (3H, s), 3.34-3.53 (1H, m), 3.63 (1H, dd, J=3Hz and 11Hz), 4.13 (2H, q, J=6Hz), 4.67 (1H, br d, J=8Hz), 5.46 (1H, br s) Example 27 To a solution of 4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (14.4 mg) in a mixture of anhydrous tetrahydrofuran (1 ml) and N,N-dimethylformamide (1 ml) was added sodium hydride (60% oil dispersion, 4.7 mg) in one portion under ice cooling. The mixture was stirred for half an hour at the same temperature and benzylbromide (13.3 mg) was added. After sitrred for 2 hours at ambient temperature, the reaction was quenched with water (2 ml) and extracted with diethyl ether (1 ml) three times. The combined organic layers were washed with water, dried, and evaporated in vacuo. The residue was purified by column chromatography on silica gel (diethyl ether/n-hexane = 1/1) to give 4-[3-(2-benzyloxyethyl)-2-methyloxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (4.8 mg). mp : 96-97°C IR (CHCl₃) : 1690, 1430, 1240, 1105 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.16 (1H, m), 1.19 (3H, s), 1.16-2.10 (6H, m), 2.50 (1H, d, J=4Hz), 2.78 (1H, dd, J=8 and 5Hz), 2.94 (1H, d, J=4Hz), 3.41-3.52 (7H, m), 3.60-3.72 (7H, m), 4.53 (2H, s), 5.55 (1H, m), 7.36 (5H, br s) Example 28 The following compounds were prepared in a similar manner to that of Example 27. (1) 4-{3-[2-(3,4-Dimethylbenzyloxy)ethyl]-2-methyloxiranyl}-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane. Oil IR (Neat) : 1695, 1420, 1240, 1105 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.15 (1H, m), 1.20 (3H, s), 1.61-2.10 (6H, m), 2.22 and 2.28 (each 3H, 2 isomers'), 2.48 and 2.50 (1H, d, J=4Hz, 2 isomers'), 2.76 (1H, dd, J=8 and 5Hz), 2.95 and 2.98 (1H, d, J=4Hz, 2 isomers'), 3.40-3.55 (5H, m), 3.47 (3H, s), 3.55-3.80 (6H, m), 4.48 and 4.55 (2H, 2 isomers'), 5.58 (1H, br s), 7.01-7.20 (3H, m) (2) 4-{3-[2-(4-Chlorobenzyloxy)ethyl]-2-methyloxiranyl}-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane. Oil IR (Neat) : 1690, 1420, 1240, 1105 cm⁻¹ NMR (CDCl₃, δ) : 1.05-1.16 (1H, m), 1.20 (3H, s), 1.65-2.10 (6H, m), 2.51 (1H, d, J=4Hz), 2.75 (1H, dd, J=8 and 5Hz), 2.94 (1H, d, J=4Hz), 3.46 (3H, s), 3.40-3.55 (5H, m), 3.55-3.70 (6H, m), 4.49 (2H, s), 5.58 (1H, br s), 7.22-7.36 (4H, m) Example 29 To a solution of 4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-6-morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (76.2 mg) in a mixture of toluene (2 ml) and N,N-dimethylformamide (1 ml) was added sodium hydride (20.5 mg) in one portion under ice cooling. The mixture was stirred for half an hour at the same temperature and ethyl bromoacetate (68.5 mg) was added. After stirred for 3 hours at ambient temperature, the reaction mixture was quenched with aqueous saturated ammonium chloride solution (2 ml). The organic layer was washed with brine, dried, and evaporated in vacuo. The residue was purified by column chromatography on silica gel (diethyl ether) to give 4-[3-(2-ethoxycarbonylmethoxyethyl)-2-methyloxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (66.9 mg). Oil IR (Neat) : 1740, 1685, 1450, 1260, 1140 cm⁻¹ NMR (CDCl₃, δ) : 1.04-1.15 (1H, m), 1.20 (3H, s), 1.30 (3H, t, J=7Hz), 1.58-2.14 (6H, m), 2.58 (1H, d, J=4Hz), 2.80 (1H, dd, J=8 and 5Hz), 3.00 (1H, d, J=4Hz), 3.47 (3H, s), 3.32-3.55 (4H, m), 3.55-3.78 (7H, m), 4.10 (2H, s), 4.20 (2H, q, J=7Hz), 5.58 (1H, br s) Example 30 To a solution of 4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (11.1 mg) in anhydrous tetrahydrofuran (1 ml) was added sodium hydride (60% oil dispersion, 2.4 mg) in one portion under ice cooling. The mixture was stirred for half an hour at the same temperature and butyl isocyanate (4.5 mg) was added. After stirred for 2 hours at ambient temperature, the solvent was diluted with diethyl ether (2 ml) and washed with water, dried, and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (ethyl acetate) to afford 4-[3-(2-butylcarbamoyloxyethyl)-2-methyloxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane (10.8 mg). Oil IR (Neat) : 3350, 1690, 1420, 1240, 1105 cm⁻¹ NMR (CDCl₃, δ) : 0.92 (3H, t, J=6Hz), 1.22 (3H, s), 1.10-1.58 (5H, m), 1.70-2.10 (6H, m), 2.58 (1H, d, J=4Hz), 2.70 (1H, dd, J=8 and 5Hz), 2.88 (1H, d, J=4Hz), 3.18 (2H, dt, J=6Hz), 3.47 (3H, s), 3.40-3.55 (5H, m), 3.55-3.88 (4H, m), 4.12-4.36 (2H, m), 4.70-4.83 (1H, m), 5.55 (1H, br s) Example 31 The following compound was prepared in a similar manner to that of Example 30. 4-[2-Methyl-3-(2-propylcarbamoyloxyethyl)oxiranyl]-5-methoxy-6-(morpholinocarbonyloxy)-1-oxaspiro[2,5]octane. Oil IR (Neat) : 3350, 1690, 1420, 1240, 1105 cm⁻¹ NMR (CDCl₃, δ) : 0.92 (3H, t, J=6Hz), 1.20 (3H, s), 1.10-2.10 (9H, m), 2.58 (1H, d, J=4Hz), 2.70 (1H, dd, J=8 and 5Hz), 2.88 (1H, d, J=4Hz), 3.13 (2H, dt, J=6Hz), 3.47 (3H, s), 3.40-3.55 (5H, m), 3.55-3.88 (4H, m), 4.12-4.36 (2H, m), 4.70-4.83 (1H, m), 5.55 (1H, br s) Example 32 A mixture of 6-cyclohexylcarbamoyloxy-4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-1-oxaspiro[2,5] octane (5 mg), acetic anhydride (12 µℓ), pyridine (11 µl), and 4-dimethylaminopyridine (1 mg) in dichloromethane (1 ml) was stirred for 1.1 hours at ambient temperature. The mixture was diluted with diethyl ether and washed with brine (4X). The organic layer was dried and concentrated in vacuo. The residue was purified by column chromatography on silica gel to yield 4-[3-(2-acetoxyethyl)-2-methyloxiranyl]-6-cyclohexylcarbamoyloxy-5-methoxy-1-oxaspiro[2,5]octane as an oil (3.7 mg). IR (CHCl₃) : 3450, 1710 cm⁻¹ NMR (CDCl₃, δ) : 1.00-1.50 (9H, m), 1.20 (3H, s), 1.51-2.17 (8H, m), 2.08 (3H, s), 2.60 (1H, d, J=4Hz), 2.68 (1H, dd, J=4Hz and 7Hz), 2.86 (1H, d, J=4Hz), 3.45 (3H, s), 3.38-3.55 (1H, m), 3.65 (1H, dd, J=3Hz and 12Hz), 4.13-4.36 (2H, m), 4.66 (1H, br d, J=7Hz), 5.45 (1H, br s) Example 33 A mixture of 6-hydroxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (400 mg), p-nitrophenyl chloroformate (570 mg) and pyridine (1.37 ml) in dichloromethane (6 ml) was stirred for 3 hours at ambient temperature and then piperazine (1.0 g) was added thereto. After stirring at ambient temperature for half an hour, the mixture was treated with ethanesulfonyl chloride (183 mg). The reaction mixture was stirred for 15 minutes at 0°C and for 3 hours at ambient temperature. The resulting mixture was diluted with diethyl ether and washed with 1N HCl, 1N NaOH and brine. The organic layer was dried and concentrated in vacuo to give a crude oil which was purified by silica gel column chromatography to yield 6-[4-(ethanesulfonyl)piperazin-1-ylcarbonyloxy]-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]- 1-oxaspiro[2,5]octane as crystal. mp : 91-92°C (Ether/hexane) IR (Nujol) : 1680, 1455 cm⁻¹ NMR (CDCl₃, δ) : 1.07-1.20 (1H, m), 1.23 (3H, s), 1,40 (3H, t, J=7Hz), 1.69 (3H, s), 1.78 (3H, s), 1.57-2.50 (6H, m), 2.59 (1H, d, J=4Hz), 2.58 (1H, t, J=6Hz), 2.99 (2H, q, J=7Hz), 3.03 (1H, d, J=4Hz), 3.10-3.95 (8H, m), 3.49 (3H, s), 3.67 (1H, dd, J=12, 2Hz), 5.23 (1H, br t, J=7Hz), 5.62 (1H, br s) Example 34 A mixture of 6-(4,5-dihydroxy-2-hexenoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (which is the same compound as "WF 2015A" and was prepared in the same manner as that described in European Patent Application Publication No. 0314401) (34 mg), acetic anhydride (34 µl), pyridine (30 µl), and 4-dimethylaminopyridine (1 mg) in dichloromethane (0.7 ml) was stirred overnight at ambient temperature. The mixture was diluted with diethyl ether and washed with brine (X3). The organic layer was dried and concentrated in vacuo to yield 6-(4,5-diacetoxy-2-hexenoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (41.7 mg) as a colorless oil. IR (CHCl₃) : 1730, 1720 cm⁻¹ NMR (CDCl₃, δ) : 1.23 (3H, s), 1.26 (3H, s), 1.05-1.15 (1H, m), 1.66 (3H, s), 1.74 (3H, s), 1.7-2.5 (6H, m), 2.04 (3H, s), 2.14 (3H, s), 2.57 (1H, d, J=4Hz), 2.60 (1H, t, J=5, 4Hz), 3.00 (1H, d, J=4Hz), 3.42 (3H, s), 3.70 (1H, dd, J=12Hz and 2Hz), 5.12 (1H, m), 5.21 (1H, t, J=7Hz), 5.59 (1H, m), 5.71 (1H, m), 6.10 (1H, dd, J=15Hz and 1Hz) Example 35 The following compounds were prepared in a similar manner to that of Example 34. (1) 6-(4,5-Dibenzyloxy-2-hexenoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. mp : 37-39°C IR (CHCl₃) : 1715, 1260, 1100 cm⁻¹ NMR (CDCl₃, δ) : 1.02-1.18 (1H, m), 1.20 (3H, s), 1.49 (3H, d, J=6Hz), 1.65 (3H, s), 1.75 (3H, s), 1.81-2.45 (6H, m), 2.55 (1H, d, J=4Hz), 2.57 (1H, t, J=6Hz), 2.98 (1H, d, J=6Hz), 3.43 (3H, s), 3.70 (1H, dd, J=3Hz and 10Hz), 5.68 [1H, br t, J=8Hz), 5.43-5.57 (1H, m), 5.70 (1H, br s), 5.95 (1H, br s), 6.22 (1H, dd, J=1Hz and 15Hz), 7.07 (1H, dd, J=5Hz and 15Hz), 7.35-7.68 (6H, m), 7.93-8.12 (4H, m) (2) 6-(4-Acetoxycrotonoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 1730, 1715 cm⁻¹ NMR (CDCl₃, δ) : 1.03-1.18 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.84-2.50 (6H, m), 2.15 (3H, s), 2.56 (1H, d, J=4Hz), 2.60 (1H, t, J=6Hz), 3.00 (1H, d, J=4Hz), 3.44 (3H, s), 3.69 (1H, dd, J=2Hz and 12Hz), 4.71-4.78 (2H, m), 5.22 (1H, br t, J=7Hz), 5.70 (1H, br s), 6.09 (1H, d, J=16Hz), 6.94 (1H, td, J=5Hz and 16Hz) Example 36 To a mixture of 6-carboxymethoxy-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane (9.0 mg), triethylamine (2.5 mg), and 4-dimethylaminopyridine (0.6 mg) in dichloromethane (1 ml) was added dropwise tert-butylcarbonyl chloride (3.5 mg) under ice cooling. The mixture was stirred for half an hour at ambient temperature and propylamine (2.9 mg) was added. After stirred for 2 hours at the same temperature, the solution was washed with water, aqueous HCl solution, saturated aqueous NaHCO₃ solution, and brine successively. The organic layer was dried and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (diethyl ether - ethyl acetate = 1-1) to give 5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-propylcarbamoylmethoxy-1-oxaspiro[2,5]octane (7.6 mg). Oil IR (Neat) : 3350, 1660, 1540, 1440, 1380, 1110 cm⁻¹ NMR (CDCl₃, δ) : 0.92 (3H, t, J=7Hz), 0.95-1.06 (1H, m), 1.22 (3H, s), 1.45-1.70 (2H, m), 1.65 (3H, s), 1.73 (3H, s), 1.90-2.46 (6H, m), 2.55 (1H, d, J=4Hz), 2.58 (1H, t, J=8Hz), 2.96 (1H, d, J=4Hz), 3.08-3.42 (2H, m), 3.48 (3H, s), 3.60 (1H, dd, J=11 and 3Hz), 3.88 (1H, d, J=15Hz), 3.95 (1H, br s), 4.14 (1H, d, J=15Hz), 5.22 (1H, br t, J=8Hz), 7.50 (1H, br s) Example 37 The following compound was prepared in a similar manner to that of Example 9. 6-(3-Carboxypropylcarbamoyloxy)-5-methoxy-4-[2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-1-oxaspiro[2,5]octane. Oil IR (CHCl₃) : 3440, 3100, 1710, 1100 cm⁻¹ NMR (CDCl₃, δ) : 0.95-1.12 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.70-2.52 (10H, m), 2.53 (1H, d, J=7Hz), 2.76 (1H, t, J=7Hz), 2.94 (1H, d, J=6Hz), 2.96-3.18 (2H, m), 3.43 (3H, s), 3.58 (1H, dd, J=14, 2Hz), 4.92-5.06 (1H, m), 5.18 (1H, br t, J=7Hz), 5.47 (1H, br s) Example 38 To a solution of 5-methoxy-4-[(2-methyl-3-(3-methyl-2-butenyl)oxiranyl]-6-methylcarbamoyloxy-1-oxaspiro[2,5]octane (382 mg) in a mixture of methanol (1.0 ml) and dichloromethane (10 ml) was passed through ozone for 5 minutes at -78°C. After bubbling of nitrogen, solvent was removed and methanol (5 ml) was added to this mixture. This solution was cooled to 0°C and sodium borohydride (20 mg) was then added. The reaction mixture was stirred for 30 minutes at 0°C, and then water (3 ml) was added. The reaction mixture was diluted with ethyl acetate. The ethyl acetate solution was washed with water and brine and then dried over MgSO₄. Evaporation of solvents in vacuo gave essentially pure alcohol, 4-[3-(2-hydroxyethyl)-2-methyloxiranyl]-5-methoxy-6-methylcarbamoyl-1-oxaspiro[2,5]octane (300 mg), which was used in the next step without further purification. The crude alcohol (29 mg) was dissolved in tetrahydrofuran (2 ml) at 0°C and sodium hydride (60% oil, 20 mg) was then added. The reaction mixture was stirred for 30 minutes and methyl isocyanate (11 µl) was added. The mixture was stirred for 6 hours at ambient temperature. The solution was recooled (0°C) and diluted with ether (10 ml) and water (1 ml) was cautiously added. The extracted ether solution was washed with brine and dried (MgSO₄). The solvents were removed in vacuo, and the resulting residue was purified by thin layer chromatography to provide 5-methoxy-4-[2-methyl-3-(2-methylcarbamoyloxyethyl)oxiranyl]-6-methylcarbamoyloxy-1-oxaspiro[2,5]octane (4.4 mg). NMR (CDCl₃, δ) : 1.05-1.23 (1H, m), 1.20 (3H, s), 1.73-2.12 (6H, m), 2.59 (1H, d, J=4Hz), 2.71 (1H, dd, J=8, 5Hz), 2.78 (3H, d, J=5Hz), 2.79 (3H, d, J=5Hz), 2.87 (1H, d, J=4Hz), 3.46 (3H, s), 3.65 (1H, dd, J=12, 3Hz), 4.15-4.49 (2H, m), 4.64-4.83 (2H, br s), 5.43-5.53 (1H, br s)

Claims: Claims for the following Contracting States : AT, BE, CH, DE, FR, GB, IT, LI, LU, NL, SE An oxaspiro[2,5]octane derivative of the formula : wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆ )alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy(C₁-C₆)-alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or pharmaceutically acceptable salt thereof. The compound of claim 1, wherein R¹ is C₁-C₆ alkylcarbamoyl, R² is C₁-C₆ alkoxy and R³ is The compound of claim 2, wherein R¹ is methylcarbamoyl, R² is methoxy and R³ is the same as defined in claim 2. A process for preparing an oxaspiro[2,5]octane derivative of the formula: wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy-(C₁-C₆)alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or salt thereof, which comprises, (a) reacting a compound of the formula : with a compound of the formula : R 1 / aOH (III) or reactive derivative thereof or salt thereof to give a compound of the formula : or salt thereof; (b) reacting a compound of the formula : with a compound of the formula : R 1 / bX (IV) to give a compound of the formula : or salt thereof; (c) subjecting a compound of the formula : to removal reaction of the carbamoyl-protective group to give a compound of the formula : (d) subjecting a compound of the formula : to removal reaction of the carboxy-protective group to give a compound of the formula : or salt thereof; (e) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : or salt thereof; (f) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : (g) subjecting a compound of the formula : or salt thereof to ozonolysis and then reducing the resultant compound to give a compound of the formula : or salt thereof; (h) subjecting a compound of the formula : or salt thereof to ozonolysis and then treating the resultant compound with methyl sulfide and then reacting the resultant compound with a compound of the formula : (R⁵)₃P=CHR⁶ (VII) to give a compound of the formula : or salt thereof; (i) oxidizing a compound of the formula : to give a compound of the formula : (j) subjecting a compound of the formula : or salt thereof to catalytic reduction to give a compound of the formula : or salt thereof; (k) reducing a compound of the formula : to give a compound of the formula : (ℓ) reacting a compound of the formula : or salt thereof with an alkylating agent to give a compound of the formula : or salt thereof; (m) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or salt thereof ; (n) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or (o) reacting a compound of the formula : or reactive derivative at the carboxy group with C₁-C₆ alkylamine or salt thereof to give a compound of the formula : wherein R¹, R² R³ are each as defined above, R 1 / a is carbamoyl, C₁-C₆ alkylcarbamoyl, hydroxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alxoxycarbonyl(C₁-C₆)alkylcarbomoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R 1 / b is C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; R 1 / c is a protected carbamoyl, R 1 / d is a protected carboxy(C₁-C₆)alkyl or a protected carboxy(C₁-C₆)alkylcarbamoyl, R 1 / e is carboxy(C₁-C₆)alkyl, X is acid residue, R 1 / f is C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; morpholinocarbonyl; morpholinocarbamoyl: thiomorpholin-4-ylcarbonyl; piperidinocarbonyl; piperidinocarbamoyl; hydroxypiperidinocarbonyl; C₁-C₆ alkylpiperidinocarbonyl; 2-oxopyrrolidin-1-yl(C₁-C₆)alkylcarbamoyl; hydroxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; C₁-C₆ alkoxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; pyperazin-1-ylcarbonyl;or C₁-C₆ alkoxycarbonylpiperazin-1-ylcarbonyl; R⁴ is hydroxycarbonyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxycarbonyloxy(C₁-C₆)alkyl]-(C₁-C₆)alkylcarbamoyl or hydroxycarbonyloxypiperidinocarbonyl, R 1 / g is C₁-C₆ alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl, N-[thiomorpholin-4-ylcarbonyloxy-(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl, N-[morpholinocarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl or C₁-C₆ alkylcarbamoyloxypiperidinocarbonyl, R 3 / a is R 3 / b is R 3 / c is wherein R⁶ is protected carboxy, R⁵ is aryl, R 1 / h is thiomorpholin-4-ylcarbonyl or R 1 / i is 1-oxothiomorpholin-4-ylcarbonyl, 1,1-dioxothiomorpholin-4-ylcarbonyl or -COCH=CHCHO, R 3 / d is or wherein R⁶ is the same as defined above, R 3 / e is or wherein R⁶ is the same as defined above, R 3 / f is wherein R⁷ is a protected carboxy-(C₁-C₆)-alkyl, or phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen, R 3 / g is wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl R 1 / j is or -COCH=CHCH₂OH R 1 / k is wherein R⁸ is C₁-C₆ alkylsulfonyl wherein R⁸ is C₁-C₆ alkanoyl or phenyl(C₁-C₆) alkanoyl or -COCH=CHCH₂OR⁸ wherein R⁸ is C₁-C₆ alkanoyl R 1 / ℓ is carboxy(C₁-C₆)alkyl and R 1 / m is lower alkylcarbamoyl(C₁-C₆)alkyl. A pharmaceutical composition, which comprises, as an active ingredient, the oxaspiro[2,5]octane derivative (I) of claim 1 or pharmaceutically acceptable salt thereof and pharmaceutically acceptable carrier(s). Claims for the following Contracting State : ES A process for preparing an oxaspiro[2,5]octane derivative of the formula: wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomrpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy-(C₁-C₆)alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or salt thereof, which comprises, (a) reacting a compound of the formula : with a compound of the formula : R 1 / aOH (III) or reactive derivative thereof or salt thereof to give a compound of the formula : or salt thereof; (b) reacting a compound of the formula : with a compound of the formula : R 1 / bX (IV) to give a compound of the formula : or salt thereof; (c) subjecting a compound of the formula : to removal reaction of the carbamoyl-protective group to give a compound of the formula : (d) subjecting a compound of the formula : to removal reaction of the carboxy-protective group to give a compound of the formula : or salt thereof; (e) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : or salt thereof; (f) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : (g) subjecting a compound of the formula : or salt thereof to ozonolysis and then reducing the resultant compound to give a compound of the formula : or salt thereof; (h) subjecting a compound of the formula : or salt thereof to ozonolysis and then treating the resultant compound with methyl sulfide and then reacting the resultant compound with a compound of the formula : (R⁵)₃P=CHR⁶ (VII) to give a compound of the formula : or salt thereof; (i) oxidizing a compound of the formula : to give a compound of the formula : (j) subjecting a compound of the formula : or salt thereof to catalytic reduction to give a compound of the formula : or salt thereof; (k) reducing a compound of the formula : to give a compound of the formula : (ℓ) reacting a compound of the formula : or salt thereof with an alkylating agent to give a compound of the formula : or salt thereof; (m) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or salt thereof ; (n) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or (o) reacting a compound of the formula : or reactive derivative at the carboxy group with C₁-C₆ alkylamine or salt thereof to give a compound of the formula : wherein R¹, R² R³ are each as defined above, R 1 / a is carbamoyl, C₁-C₆ alkylcarbamoyl, hydroxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbomoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R 1 / b is C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; R 1 / c is a protected carbamoyl, R 1 / d is a protected carboxy(C₁-C₆)alkyl or a protected carboxy(C₁-C₆)alkylcarbamoyl, R 1 / e is carboxy(C₁-C₆)alkyl, X is acid residue, R 1 / f is C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; morpholinocarbonyl; morpholinocarbamoyl: thiomorpholin-4-ylcarbonyl; piperidinocarbonyl; piperidinocarbamoyl; hydroxypiperidinocarbonyl; C₁-C₆ alkylpiperidinocarbonyl; 2-oxopyrrolidin-1-yl(C₁-C₆)alkylcarbamoyl; hydroxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; C₁-C₆ alkoxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; pyperazin-1-ylcarbonyl;or C₁-C₆ alkoxycarbonylpiperazin-1-ylcarbonyl; R⁴ is hydroxycarbonyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxycarbonyloxy(C₁-C₆)alkyl]-(C₁-C₆)alkylcarbamoyl or hydroxycarbonyloxypiperidinocarbonyl, R 1 / g is C₁-C₆ alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl, N-[thiomorpholin-4-ylcarbonyloxy-(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl, N-[morpholinocarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl or C₁-C₆ alkylcarbamoyloxypiperidinocarbonyl, R 3 / a is R 3 / b is R 3 / c is wherein R⁶ is protected carboxy, R⁵ is aryl, R 1 / h is thiomorpholin-4-ylcarbonyl or R 1 / i is 1-oxothiomorpholin-4-ylcarbonyl, 1,1-dioxothiomorpholin-4-ylcarbonyl or -COCH=CHCHO, R 3 / d is or wherein R⁶ is the same as defined above, R 3 / e is or wherein R⁶ is the same as defined above, R 3 / f is wherein R⁷ is a protected carboxy-(C₁-C₆)-alkyl, or phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen, R 3 / g is wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl R 1 / j is or -COCH=CHCH₂OH R 1 / k is wherein R⁸ is C₁-C₆ alkylsulfonyl wherein R⁸ is C₁-C₆ alkanoyl or phenyl(C₁-C₆) alkanoyl or -COCH=CHCH₂OR⁸ wherein R⁸ is C₁-C₆ alkanoyl R 1 / ℓ is carboxy(C₁-C₆)alkyl and R 1 / m is lower alkylcarbamoyl(C₁-C₆)alkyl. A process as claimed in claim 1, wherein R¹ is C₁-C₆ alkylcarbamoyl, R² is C₁-C₆ alkoxy and R³ is A process as claimed in claim 2, wherein R¹ is methylcarbamoyl, R² is methoxy and R³ is the same as defined in claim 2. A process for preparing a pharmaceutical composition which comprises admixing or presenting an oxaspiro [2, 5] octane derivative of formula (I), or a pharmaceutically acceptable salt thereof, with one or more pharmaceutically acceptable carriers. Claims for the following Contracting State : GR An oxaspiro[2,5]octane derivative of the formula : wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoylox(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy(C₁-C₆)-alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or pharmaceutically acceptable salt thereof. The compound of claim 1, wherein R¹ is C₁-C₆ alkylcarbamoyl, R² is C₁-C₆ alkoxy and R³ is The compound of claim 2, wherein R¹ is methylcarbamoyl, R² is methoxy and R³ is the same as defined in claim 2. A process for preparing an oxaspiro[2,5]octane derivative of the formula: wherein R¹ is carbamoyl; C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may be have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; C₁-C₆ alkylcarbamoyl(C₁-C₆)alkyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R² is C₁-C₆ alkoxy and R³ is wherein R⁶ is a protected carboxy; wherein R⁶ is a protected carboxy; wherein R⁷ is a protected carboxy-(C₁-C₆)alkyl or phenyl- or naphtyl-(C₁-C₆) alkyl which may have halogen; or wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl or salt thereof, which comprises, (a) reacting a compound of the formula : with a compound of the formula : R 1 / aOH (III) or reactive derivative thereof or salt thereof to give a compound of the formula : or salt thereof; (b) reacting a compound of the formula : with a compound of the formula : R 1 / bX (IV) to give a compound of the formula : or salt thereof; (c) subjecting a compound of the formula : to removal reaction of the carbamoyl-protective group to give a compound of the formula : (d) subjecting a compound of the formula : to removal reaction of the carboxy-protective group to give a compound of the formula : or salt thereof; (e) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : or salt thereof; (f) reacting a compound of the formula : or its reactive derivative at the carboxy group with an amine to give a compound of the formula : (g) subjecting a compound of the formula : or salt thereof to ozonolysis and then reducing the resultant compound to give a compound of the formula : or salt thereof; (h) subjecting a compound of the formula : or salt thereof to ozonolysis and then treating the resultant compound with methyl sulfide and then reacting the resultant compound with a compound of the formula : (R⁵)₃P=CHR⁶ (VII) to give a compound of the formula : or salt thereof; (i) oxidising a compound of the formula : to give a compound of the formula : (j) subjecting a compound of the formula : or salt thereof to catalytic reduction to give a compound of the formula : or salt thereof; (k) reducing a compound of the formula : to give a compound of the formula : (ℓ) reacting a compound of the formula : or salt thereof with an alkylating agent to give a compound of the formula : or salt thereof; (m) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or salt thereof (n) reacting a compound of the formula : or salt thereof with an acylating agent to give a compound of the formula : or (o) reacting a compound of the formula : or reactive derivative at the carboxy group with C₁-C₆ alkylamine or salt thereof to give a compound of the formula : wherein R¹, R² R³ are each as defined above, R 1 / a is carbamoyl, C₁-C₆ alkylcarbamoyl, hydroxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl; N-[thiomorpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; N-[morpholinylcarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; C₁-C₆ alkylthiocarbamoyl; piperidinylcarbamoyl; morpholinylcarbamoyl: phenyl(C₃-C₆)alkenoyl; naphtyl(C₃-C₆)alkenoyl; C₁-C₆ alkoxycarbonyl; heterocycliccarbonyl selected from the group of morpholinylcarbonyl, thiomorpholinylcarbonyl, pyrrolidinylcarbonyl, piperidylcarbonyl and piperazinylcarbonyl which may have C₁-C₆ alkyl, hydroxy, hydroxy(C₁-C₆)alkyl, C₁-C₆ alkoxy(C₁-C₆)alkyl or C₁-C₆ alkoxycarbonyl; hydroxy(C₃-C₆)alkenoyl; C₁-C₆ alkanoyloxy(C₃-C₆)alkenoyl; di(C₁-C₆)alkanoyloxy(C₃-C₆)alkenoyl;or dibenzoyloxy(C₃-C₆)alkenoyl; R 1 / b is C₁-C₆ alkyl; carboxy(C₁-C₆)alkyl; protected carboxy(C₁-C₆)alkyl; phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen or C₁-C₆ alkoxy; pyridyl- or quinolyl-(C₁-C₆)alkyl; R 1 / c is a protected carbamoyl, R 1 / d is a protected carboxy(C₁-C₆)alkyl or a protected carboxy(C₁-C₆)alkylcarbamoyl, R 1 / e is carboxy(C₁-C₆)alkyl, X is acid residue, R 1 / f is C₁-C₆ alkylcarbamoyl; hydroxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxy(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylthio(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkoxycarbonyl(C₁-C₆)alkylcarbamoyl; C₁-C₆ alkylcarbamoyloxy(C₁-C₆)-alkylcarbamoyl: di(C₁-C₆)alkylcarbamoyl: N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl; cyclo(C₃-C₇)alkylcarbamoyl; phenylcarbamoyl; naphtylcarbamoyl; halophenylcarbamoyl; halonaphtylcarbamoyl; protected carbamoyl; morpholinocarbonyl; morpholinocarbamoyl: thiomorpholin-4-ylcarbonyl; piperidinocarbonyl; piperidinocarbamoyl; hydroxypiperidinocarbonyl; C₁-C₆ alkylpiperidinocarbonyl; 2-oxopyrrolldin-1-yl(C₁-C₆)alkylcarbamoyl; hydroxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; C₁-C₆ alkoxy(C₁-C₆)alkylpyrrolidin-1-ylcarbonyl; pyperazin-1-ylcarbonyl;or C₁-C₆ alkoxycarbonylpiperazin-1-ylcarbonyl; R⁴ is hydroxycarbonyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxycarbonyloxy(C₁-C₆)alkyl]-(C₁-C₆)alkylcarbamoyl or hydroxycarbonyloxypiperidinocarbonyl, R 1 / g is C₁-C₆ alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, N-[hydroxy(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyloxy(C₁-C₆)alkylcarbamoyl, C₁-C₆ alkylcarbamoyloxy(C₃-C₆)alkenoyl, N-(thiomorpholin-4-ylcarbonyloxy-(C₁-C₆)alkyl](C₁-C₆)alkylcarbamoyl, N-[morpholinocarbonyloxy(C₁-C₆)-alkyl](C₁-C₆)alkylcarbamoyl or C₁-C₆ alkylcarbamoyloxypiperidinocarbonyl, R 3 / a is R 3 / b is R 3 / c is wherein R⁶ is protected carboxy, R⁵ is aryl, R 1 / h is thiomorpholin-4-ylcarbonyl or R 1 / i is 1-oxothiomorpholin-4-ylcarbonyl, 1,1-dioxothiomorpholin-4-ylcarbonyl or -COCH=CHCHO, R 3 / d is or wherein R⁶ is the same as defined above, R 3 / e is or wherein R⁶ is the same as defined above, R 3 / f is wherein R⁷ is a protected carboxy-(C₁-C₆)-alkyl, or phenyl- or naphtyl-(C₁-C₆)alkyl which may have halogen, R 3 / g is wherein R⁸ is C₁-C₆ alkanoyl or C₁-C₆ alkylcarbamoyl R 1 / j is or -COCH=CHCH₂OH R 1 / k is wherein R⁸ is C₁-C₆ alkylsulfonyl wherein R⁸ is C₁-C₆ alkanoyl or phenyl(C₁-C₆) alkanoyl or -COCH=CHCH₂OR⁸ wherein R⁸ is C₁-C₆ alkanoyl R 1 / ℓ is carboxy(C₁-C₆)alkyl and R 1 / m is lower alkylcarbamoyl(C₁-C₆)alkyl. A process for preparing a pharmaceutical composition which comprises admixing or presenting an oxaspiro [2, 5] octane derivative of formula (I), or a pharmaceutically acceptable salt thereof, with one or more pharmaceutically acceptable carriers.

Inventors: HASHIMOTO MASASHI, KASAHARA CHIYOSHI, OHKAWA TAKEHIKO, OKU TERUO, HASHIMOTO, MASASHI, KASAHARA, CHIYOSHI, OHKAWA, TAKEHIKO, OKU, TERUO
Applicants: FUJISAWA PHARMACEUTICAL CO, FUJISAWA PHARMACEUTICAL CO., LTD.
Application year: 1989
Main classification: C07D303
IPC codes: A61K31, C07D303, A61P35, A61P5, A61P9, C07D405