CN1055929C - Trifluoromethyl steroids and the prepn. method - Google Patents
Trifluoromethyl steroids and the prepn. method Download PDFInfo
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- CN1055929C CN1055929C CN93112563A CN93112563A CN1055929C CN 1055929 C CN1055929 C CN 1055929C CN 93112563 A CN93112563 A CN 93112563A CN 93112563 A CN93112563 A CN 93112563A CN 1055929 C CN1055929 C CN 1055929C
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- trifluoro
- trifluoromethyl
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Abstract
The present invention provides steroids and a preparation method thereof. The steroids have trifluoromethyl and hydroxy at C17 position or the same carbon atom at an extended side chain. Steroids which have carbonyl at C17 position or an extended side chain thereof are used as raw materials; the steroids and Me4NF and CF3SiMe3 generate addition reaction; then, a 10 to 50% HF water solution and water soluble polar solvents are used for hydrolysis to obtain the compounds. The product can be further purified by column chromatography; the present invention also provides a convenient and high-yield method for introducing trifluoromethyl to steroids.
Description
The present invention relates to class trifluoro-methyl steroid and preparation method thereof, the class of further saying so has the steroidal compounds of trifluoromethyl on C17 position and side chain thereof, can obtain easily by addition and hydrolysis two steps reaction.
Fluorinated organic compound plays epochmaking effect at aspects such as medicine, agricultural and Industrial materials, causes people's attention day by day.Especially with some natural molecules or have physiologically active substance and carry out texture improvement to obtain the bigger analogue of physiologically active.As with regard to Vitamin D3 500,000 I.U/GM, introduce 1 α of fluorine atom, the two hydroxyls-26,26,26,27,27 of 25-, 27-hexafluoro vitamins D
3, its specific activity parent is high 40 times.Consider from steric factor, fluorine atom is a space requirement and little group, its van der Waals radius is 1.35 , very near the van der Waals radius (120 ) of hydrogen atom, consequently when the hydrogen atom in organic molecule is replaced by fluorine atom, often only produce minimum steric factor and change, thereby be difficult for being discerned by the enzyme system of organism, strong C-F chain has then given the ability of molecule blocking-up metabolic process.On the other hand, the high electronegativity of fluorine atom all will produce deep effect to the chemical stability and the Cloud Distribution of whole molecule, so that change the acid-basicity of adjacent group, stability and molecule fat-soluble, intramolecular moment of dipole, the entire reaction of molecule etc.Therefore many synthetic scientists hanker after fluorine atom, trifluoromethyl group are introduced in the natural product, obtain the analogue stronger than parent activity with it.
Because it is few to contain the raw material type of trifluoromethyl, only CF
3I, CF
3Br, CF
3Limited several such as COOH, trifluoromethyl negative ion and organometallics thereof be all easily cancellations generally.So so far bibliographical information directly draw trifluoromethyl reagent seldom, CuCF is only arranged
3, NaOC-CF
3, CF
3-OSOCF
3, (CF
3)
2Hg etc., but these reagent react activity are not high, reaction conditions is more violent, and this makes its application on multi-functional steroidal compounds be subjected to very big restriction, and once report used the illumination method with CF
3I is added to the steroidal Δ
3Ethylene linkage on, 3 α-trifluoromethyl thing (1) [J.Medicinal Chem, 14,164 (1971)], use CF
3CO
2CH
2CH
3React with the steroidal parent nucleus, on side chain, introduce trifluoromethyl (2) [Tetrahedron Lett, 22,4309 (1981)], utilize condensation reaction synthetic 18,18, the steroidal compounds (3) [J.Chem.Soc.Perkiul, 337 (1986)] that the 18-trifluoro replaces utilizes the sulfone that contains trifluoromethyl to react, introduce 24 position trifluoromethyls (4), and then Synthetic 2 4-CF
3-25-hydroxy-vitamin D
3[Tetrahedron Lett, 29 (2), 237 (1988)] use CF
3Si (CH
3)
3, Bu
4NF and female fen ketone-3-methyl ether reaction was used 1.0NHCl stirring at room 15 hours after 24 hours, got the mixture (5) [Tetrahedron Lett, 932 (1980)] of 17 position trifluoromethyl compounds and raw material, used CF
3SiMe
3/ F/CuI system and alkene halogen compound react trifluoromethyl aromatic compounds and trifluoromethyl olefin(e) compound, this reaction is gentle, but has only reported the sterically hindered less aryl halide or the coupled reaction of thiazolinyl halogen, and yield instability [Tetrahedron Lett, 32,91 (1991)].Human trifluoride isopropenyl zinc reagents such as ginger mark, Xu Yuanyao have synthesized 3 beta-hydroxies-Δ
5 (6), 16 (17), 20 (22)-21 three fluoro-23,24,25,26,27-five loses carbon-cholestane.On the steroidal side chain, introduce trifluoro-methyl steroid easily.But above-mentioned reaction is not that productive rate is low, is exactly that condition is comparatively harsh, perhaps is difficult to obtain chiral material.Adopt 20-ketone compound (6) to press literature method as us, promptly use 2 millimole Bu
4NF (TBAF), 2.4 millimole CF
3SiMe
3(TMSCF
3) and (6) of 1.0 millimoles reaction 48 hours, transformation efficiency only about 40% strengthens reagent dosage, with 8 millimole TBAF, and 9 millimole TMSCF
3Reacted 48 hours, and only transformed about 70%, column chromatography for separation gets (7), yield 48%.This TBAF-TMSCF
3Reagent system is fast to sterically hindered little oxy-compound speed of response, and yield is better, and to the carbonyl addition of sterically hindered bigger steroidal compounds long reaction time then, yield is not good.If compound (7) takes off trimethylsilyl ethers by literature method with the 1N aqueous hydrochloric acid, two days unreacteds of room temperature reaction.Though change various concentration of hydrochloric acid, temperature of reaction and use Bu
4The NF reflux is not success all, reclaims raw material.So, in the functional group of steroidal and extendible side chain, introducing trifluoromethyl and be still the problem that people explore, people still expect to have the trifluoro-methyl steroid and the high yield thereof of physiologically active.Easy synthetic method.
The object of the invention provides a class trifluoro-methyl steroid.
Another object of the present invention provides a kind of method for preparing trifluoro-methyl steroid.
A class trifluoro-methyl steroid provided by the invention is at the steroidal compounds that trifluoromethyl and hydroxyl are arranged on carbon atom on the C17 position or on the side chain of its extension.
A class trifluoro-methyl steroid of the present invention can further reduce the scope and be knot
Trifluoro-methyl steroid, wherein
Be
Or
R
1Be acetoxy group, carbonyl, hydroxyl or hydrogen base, R
2Be hydrogen base, acetoxy group, hydroxyl or accelerine, R
3Be hydrogen base or hydroxyl, R
4Be trifluoromethyl or
R
5Be hydrogen base or hydroxyl, wherein R
6Be a key or C
1-6Alkyl, R
7Be C
1-5Alkyl.
Trifluoromethyl compound of the present invention can be androstane, female steroid, courage steroid, pregnant steroid and their similar compound etc. have hydroxyl and trifluoromethyl on same carbon atom on the side chain of C17 position or its extension a analogue.As 17 α-trifluoromethyl-androstane-Δ
5-3,17 β-two hydroxyls-3-acetic ester (8), 17 α-trifluoromethyl-female steroid-3,17-isoallopregnane-3 (9), 5 β, 24 ζ-trifluoromethyl-courage steroid-3 α, 6 α, 24 ζ-triol (10), 20 ζ-trifluoromethyl-pregnant steroid-Δ
5-3,20 ζ-two hydroxyls-3-acetic ester (11), 11 β-(right-N, N-dimethylaminophenyl)-17 α-trifluoromethyl-female steroid-Δ
4,9-17 beta-hydroxies-3-ketone trifluoro-methyl steroids such as (12).
Because parent is the material that physiologically active is arranged in the steroidal compounds of the invention described above, so The compounds of this invention also has physiologically active.As compound (12) is the proyl that substitutes Ru-486 in the contraceptive with trifluoromethyl, shows to have the similar antifertility activity with similar parent Ru-486 through pharmacological testing.
Above-claimed cpd provided by the invention can adopt the steroidal compounds that has carbonyl on C17 position or its extension side chain as raw material, makes through addition and hydrolysis two steps reaction.
Specifically, the steroidal compounds and the Me that on C17 position or its extension side chain, have carbonyl
4NF (TMAF) and TMSCF
3Carry out addition reaction, then with the HF aqueous solution and with the reaction that is hydrolyzed of solvent system that water dissolves each other.
At C
17The steroidal compounds and the Me that have carbonyl on position or its side chain
4NF and CF
3SiMe
3Addition reaction generates trimethyl silicane ether compound, wherein R
1Be acetoxy group, carbonyl, hydroxyl or hydrogen base, R
2Be hydrogen base, acetoxy group, hydroxyl or accelerine base, R
5Be hydrogen base or hydroxyl, R
8Be carbonyl or
R
6Be a key or C
1-6Alkyl, R
7Be C
1-5Alkyl.Steroidal compounds and Me with above-mentioned carbonyl
4NF and CF
3SiMe
3Mol ratio is 1: 0.1-5: 0.5-10, adopt more TMAF and TMSCF
3Also help reacting and carry out.Carry out but this reaction is very easily quantitative, so the recommendation ratio is 1: 0.5-1.5: 0.5-2.Common TMSCF
3Consumption 1-1.5 is enough.Temperature of reaction is-10-80 ℃, reaction times is 1 minute to 10 hours, higher temperature and longer time also can be finished reaction down, usually reaction 1 minute just can quantitatively be finished to 5 hours under the room temperature, therefore recommended temperature is 0-40 ℃, reaction times is 1 minute to 5 hours, can carry out in polar solvent in addition reaction, as THF, ether, acetonitrile, ethylene dichloride etc.
Above-mentioned addition reaction product takes off the hydrolysis reaction of trimethyl silicane can successfully be finished with the HF aqueous solution of 10-50% with the solvent system that water dissolves each other.The volume ratio of the HF aqueous solution of solvent and 10-50% can be 1: 0.2-5 is recommended as 1: 0.5-2, hydrolysis temperature are 0-80 ℃, just can finish under the room temperature usually, reaction times 0.5-20 hour, are recommended as 1-12 hour.The solvent that dissolves each other with water can be alcohol, the ketone of low carbon chain, also can be acetonitrile etc., but with acetonitrile for well.Just can obtain trifluoro-methyl steroid by above-mentioned addition and hydrolysis two steps reaction.Reaction can divide for two steps carried out, also can be after addition reaction, and intermediate is purified without separating, and can carry out the reaction of second one-step hydrolysis continuously.
Method steps of the present invention is few, can almost be converted into product quantitatively.Through hydrolyzed product, if will purify, can also carry out purifying with column chromatography method, chromatographic separation can adopt various posts, as aluminum oxide, diatomite, silica gel etc. with the mixed solvent drip washing of non-polar solvent and polar solvent.Described non-polar solvent is generally alkane, and as sherwood oil, hexane, hexanaphthene etc., polar solvent can be acetone, ethanol, acetic acid etc.The ratio of non-polar solvent and polar solvent is generally 1-50: 1, be recommended as 2-30: 1.
Adopt addition of the present invention and hydrolysis reaction to obtain product, if again after the post layer separates, total recovery is～90%.
The present invention not only provides a class trifluoro-methyl steroid, but also provides one to use TMAF-TMSCF
3Addition and the HF aqueous solution-CH
3CN hydrolysis two-step preparation process, can be very gentle easily with sterically hindered bigger steroidal carbonyl compound reaction, obtain trifluoro-methyl steroid with quantitative yield almost.As with 1mmol (6) and etc. the TMAF and the TMSCF of gram molecular weight
3Reaction, room temperature all is converted into (7) after 5 minutes, need not separate, adopt hydrolysis reaction of the present invention, promptly get compound (11) yield 97%, method of the present invention can also be applicable to that on all C17 positions and the side chain thereof the steroidal compounds of carbonyl being arranged is starting raw material, and is not subjected to restriction of the present invention.
Can further understand the present invention by following embodiment, but not limit content of the present invention.
Embodiment 1:
Synthesizing of compound (8)
330mg (1mmol) raw material is dissolved among the 2ml THF, adds 0.2ml (1.35mmol) CF
3SiMe
3, 10mg (1.09mmol) Me
4NF stirring at room reaction 3 hours, decompression are removed THF and are added 2ml CH
3CN, the HF aqueous solution of 1ml 40%, stirring is spent the night, and presses well-established law and handles crude product column chromatography sherwood oil: acetone=launch at 20: 1 gets product (8) 333mg, yield 83%.Mp:153.5-154.5 ℃ of IR (compressing tablet): 3400,1710,1350,1320,1250,1150,1050, cm
-1M/z:401 (M
++ 1) 382 (M
+-H
2O) 340 (M-HOAC), 331 (M+1-HCF
3)
19FNMR: δ, 1.69ppm
1HNMR: δ, 0.96 (3H, S, 18CH
3) 1.04 (3H, S, 19CH
3)
2.03(3H，S，CH
3CO-)?4.61(1H，m，3-H)
5.39 (1H, m, 6-H) ppm ultimate analysis: C
22H
31F
3O
3
Calculated value C:65.98 H:7.80 F:14.23
Experimental value C:65.80 H:7.76 F:14.25
Embodiment 2:
Synthesizing of compound (9)
The 284mg raw material is dissolved among the 2ml THF, adds 0.4mlCF
3SiMe
3, 0 ℃ adds 10mgMe down
4NF, 0 ℃ stir half an hour after, rise to room temperature, stirred 3 hours, THF is removed in decompression, adding 2mlCH
3CN, the HF aqueous solution of 1ml40%, stirring at room 5 hours is pressed well-established law and is handled, and crude product is through the column chromatography sherwood oil: acetone=launch at 10: 1, must product (9) 300mg, yield 88%.Mp:98-99 ℃ of IR (compressing tablet): 3400,1600,1340,1300,1150,1100,1050m/z:341 (M
++ 1) 340 (M
+) ultimate analysis: C
19H
23F
3O
2
Calculated value 340.1650
Experimental value 340.1640
Embodiment 3:
Synthesizing of compound (10)
Be dissolved among the 1.5ml THF at the 200mg raw material, add 0.15ml CF
3SiMe
3, 10mgMe
4NF room temperature reaction 1 hour, THF is removed in decompression, adds 2ml CH
3CN, the 1ml 40% HF aqueous solution, stirring at room reaction 5 hours is pressed well-established law and is handled, and crude product is used sherwood oil through column chromatography: acetone=launch at 2: 1 gets product (10) 185mg, yield 96%.Mp:209-210 ℃ of IR (compressing tablet): 3400,1337,1300,1150,1100,1050, cm
-1M/z:488 (M
+) 470 (M
+-H
2O) 452 (M-2 * H
2O) 419 (M+1-HCF
3)
19FNMR: δ, 0.88,0.59 (integration is 1: 1) ppm
1HNMR: δ, 0.69 (3H, S, 18CH
3) 0.94 (3H, S, 19-CH
3)
0.98(3H，d，J＝6.6HZ，21-CH
3)
1.07(6H，d，J＝6.6HZ，26，27-CH
3)
3.55 (1H, m, 3-H) 4.02 (1H, m, 6-H) ppm ultimate analyses: C
28H
47F
3O
3
Calculated value C:68.82 H:9.69 F:11.66
Experimental value C:68.87 H:9.78 F:11.62
Embodiment 4:
Synthesizing of compound (11)
The 358mg raw material is dissolved among the 2ml THF, adds 0.2ml CF
3SiMe
3, in the time of 0 ℃, add 20mgMe
4NF stirred under 0 ℃ 10 minutes, and room temperature reaction 5 minutes, it is yellow that solution is.Take out THF, add 2ml CH
3CN, the 0.5ml 40%HF aqueous solution, stirred overnight at room temperature adds HaHCO
3The saturated solution neutralization is pressed well-established law and is handled, and crude product is through column chromatography.Use sherwood oil: acetone=launch at 20: 1 gets product (11) 377mg, yield 88%.Mp:181-181.5 ℃
(C 0.2, MeOH) IR (compressing tablet): 3450,1710,1340,1300,1150,1100,1050,890
cm
-1m/z：368(M-HOAc)
19FNMR：δ，+3.6ppm
1HNMR：δ，0.87(3H，S，18CH
3)?1.02(3H，S，19CH
3)
1.49(3H，S，21-CH
3)?2.03(3H，S，CH
3CO)
2.32(2H，d，J＝6.61HZ，4-H)?4.63(1H，m，3-H)
5.38 (1H, m, 6-H) ppm ultimate analysis: C
24H
35F
3O
3
Calculated value C:67.26 H:8.23 F:13.30
Experimental value C:67.18 H:7.89 F:13.29
Compound (13) 38mg again, yield 9.8%mp:220-222 ℃
19FNMR ': δ ,+1ppmIR (compressing tablet): 3450-(OH), 1340,1300 (CF
3), 1100,1050 (O-C-) cm
-1Ultimate analysis: C
22H
33F
3O
2
Calculated value C:68.36 H:8.60 F:14.75
Experimental value C:68.28 H:8.66 F:14.75
Compound (13) is promptly got compound (11) with pyridine-aceticanhydride processing, yield 91.4%, so compound (11) merges total recovery 97%.
Embodiment 5:
Synthesizing of compound (12)
The 200mg raw material is dissolved among the 1.5ml THF, adds 0.2mlCF at 0 ℃
3SiMe
310mgMe
4NF after 0 ℃ of reaction half an hour, rose to stirring at room reaction 4 hours, and THF is removed in decompression, adds 2ml CH
3CN, the 1ml 40%HF aqueous solution, stirring at room 5 hours is pressed well-established law and is handled, and crude product is used sherwood oil through column chromatography: acetone=launch at 20: 1 gets product (12) 196mg, yield 96.3%.Mp:128-129 ℃ of IR (compressing tablet): 3400,1730,1650,1600,1340,1300,1150,1100,
1050，800cm
-1m/z：460(M
++1)?389(M
+-HCF
3)?121[PhN(CH
3)
2]
19FNMR：δ，2.06ppm
1HNMR：δ，0.58(3H，S，18CH
3)?3.06(6H，S，
)
5.82 (1H, S, 4-H) 7.30 (4H, m, aromatic ring) ppm ultimate analysis: C
27H
32F
3NO
2
Calculated value 459.2385
Experimental value 459.2357
Embodiment 6:
With the compound (12) that embodiment 2 is obtained, select for use female rats to divide contrast and administration group, in gestation the 6th day, the 10mg/Kg body weight was raised in the filling of administration group, and once a day, continuous three days, control group gave coordinative solvent, in the observation of cutting open the belly of pregnant fortnight.
Second day (gestation the 7th day) administration treated animal vaginal tract has blood after found that administration.Find during zootomy that there is the implantation point in its uterus, both sides, but do not see the embryo.And the control group dissection finds that the both sides intrauterine all has tire alive.Show that this compound has significantly interceptive effect.
Claims (10)
1. one kind there to be the trifluoro-methyl steroid of trifluoromethyl and hydroxyl on C17 or its extendible side chain, it is characterized in that described trifluoro-methyl steroid is to have structural formula to be
Compound, wherein
Or
R
1Be acetoxy group, carbonyl, hydroxyl or hydrogen base, R
2Be hydrogen base, acetoxy group, hydroxyl or accelerine, R
3Be hydrogen base or hydroxyl, R
4Be trifluoromethyl or
R
5Be hydrogen base or hydroxyl, R
6Be a key or C
1-6Alkyl, R
7Be C
1-5Alkyl.
2. a trifluoro-methyl steroid as claimed in claim 1 is characterized in that described trifluoro-methyl steroid is 17 α-Trifluoromethyl-1,3,5 (10) triolefin androstane-Δs
5-3,17 β-two hydroxyls-3-acetic ester.
3. a trifluoro-methyl steroid as claimed in claim 1 is characterized in that described trifluoro-methyl steroid is 17 α-trifluoromethyl-androstane-3,17-isoallopregnane-3.
4. a trifluoro-methyl steroid as claimed in claim 1 is characterized in that described trifluoro-methyl steroid is 5 β, 24 ζ-trifluoromethyl-courage steroid-3 α, 6 α, 24 ζ-triol.
5. a trifluoro-methyl steroid as claimed in claim 1 is characterized in that described trifluoro-methyl steroid is 20 ζ-trifluoromethyl-pregnant steroid-Δ
5-3,20 ζ-two hydroxyls-3-acetic ester.
6. a trifluoro-methyl steroid as claimed in claim 1 is characterized in that described trifluoro-methyl steroid is 11 β-(right-N, N-dimethylaminophenyl)-17 α-trifluoromethyl-female steroid-Δ
4,9-17 beta-hydroxies-3-ketone.
7. the preparation method as claim 1,2,3,4,5 or 6 described a kind of trifluoro-methyl steroids is characterized in that with structural formula being
The steroidal compounds and the Me that on C17 position or its side chain, have carbonyl
4NF and CF
3SiMe
3Be 1 with mol ratio respectively: 0.5-5: 0.5-10 carries out addition reaction and generates trifluoromethyl silicon ether steroidal compounds, temperature of reaction is-10-80 ℃, 1 minute to 10 hours reaction times, trifluoromethyl silicon ether steroidal compounds is hydrolyzed with the HF aqueous solution of 10-50% with polar solvent that water dissolves each other then, the volume ratio of the solvent and the HF aqueous solution can be 1: 0.2-5, hydrolysis temperature is 0-80 ℃, and the reaction times is 0.5-20 hour, wherein R
1Be acetoxy group, ether, hydroxyl or hydrogen base, R
2Be hydrogen base, acetoxy group, hydroxyl or accelerine, R
8Be carbonyl or
, R
5Be hydrogen base or hydroxyl.R
6Be a key or C
1-6Alkyl, R
7Be C
1-5Alkyl.
8. a preparation method as claimed in claim 7 is characterized in that described steroidal compounds and the Me that has carbonyl on C17 or its side chain
4NF and CF
3SiMe
3Mol ratio be 1: 0.5-1.5: 0.5-2, the addition reaction temperature is 0-40 ℃, the reaction times is 1 minute to 5 hours, solvent and 10-50%HF aqueous solution volume ratio are 1 in the hydrolysis reaction: 0.5-2, hydrolysis temperature are room temperature, hydrolysis time is 1-12 hour.
9. the preparation method of a trifluoro-methyl steroid as claimed in claim 7 is characterized in that the used solvent of described hydrolysis reaction is an acetonitrile.
10. the preparation method of a trifluoro-methyl steroid as claimed in claim 7 is characterized in that reactant purifies through column chromatography.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93112563A CN1055929C (en) | 1993-09-20 | 1993-09-20 | Trifluoromethyl steroids and the prepn. method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93112563A CN1055929C (en) | 1993-09-20 | 1993-09-20 | Trifluoromethyl steroids and the prepn. method |
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|---|---|
| CN1100729A CN1100729A (en) | 1995-03-29 |
| CN1055929C true CN1055929C (en) | 2000-08-30 |
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ID=4990162
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19706061A1 (en) * | 1997-02-07 | 1998-08-13 | Schering Ag | Anti-gestagen effective steroids with fluorinated 17alpha alkyl chain |
| AU775630B2 (en) | 1999-04-30 | 2004-08-05 | Arch Development Corporation | Steroid derivatives |
| CN100360550C (en) * | 2001-05-03 | 2008-01-09 | 芝加哥大学 | Liver X receptor agonists |
| CN100389123C (en) * | 2006-07-21 | 2008-05-21 | 中国科学院上海有机化学研究所 | Synthesis of 26-bromo-16, 22-dioxy-cholesterol compounds |
| US8829213B2 (en) | 2009-07-29 | 2014-09-09 | The University Of Chicago | Liver X receptor agonists |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0231671A1 (en) * | 1985-12-26 | 1987-08-12 | Mitsubishi Kasei Corporation | Gonatriene derivatives and process for preparing them |
| US4753932A (en) * | 1985-01-14 | 1988-06-28 | Roussel Uclaf | Novel 10-substituted steroids |
-
1993
- 1993-09-20 CN CN93112563A patent/CN1055929C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753932A (en) * | 1985-01-14 | 1988-06-28 | Roussel Uclaf | Novel 10-substituted steroids |
| EP0231671A1 (en) * | 1985-12-26 | 1987-08-12 | Mitsubishi Kasei Corporation | Gonatriene derivatives and process for preparing them |
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