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A. A. Akhrem A. V. Kamernitskii R. P. Litvinovskaya I. G. Reshetova 《Russian Chemical Bulletin》1976,25(1):150-153
| 1. | We synthesized the 3-acetates of the 23-acetoxy-and 23-carbethoxy-21,24-dinorchola-5,6-diene-3,2 0-diols and studied their dehydration. |
| 2. | The presence of an electron-acceptor grouping at C-23 directs the dehydration toward the formation of 23-caxbethoxy-21,24-dinorchola-5,16,20(22)-trans-trien-3-ol 3-acetate, which is an intermediate product in the synthesis of polyhydroxysteroids. |
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Conclusions The synthesis of 16-thiol-5-pregnene-3, 17-diol-20-one 3, 16-diacetate was accomplished.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1354–1357, June, 1972. 相似文献
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Conclusions A new method was developed for the synthesis of the 16-isobutenyl- and 16-isobutyl-20-ketopregnanes, which is based on the catalytic ene condensation of the dehydropregnenolone acetate with isobutylene.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2073–2078, September, 1972. 相似文献
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| 1. | We accomplished the stereospecific cis-opening of the aziridine ring of 16,17-epiminopregn-5-en-3-ol-20-one by treatment with thiocyanic acid in the presence of a reagent on the carbonyl group, which was accompanied by cyclization with the formation of 2-aminopregn-5-en-3-ol-20-one[16,17-d]thiazoline. |
| 2. | Employing IR and UV spectroscopy, a study was made of the structure and tautomeric equilibrium of the 2aminothiazolines and their N-acetylated derivatives; all of the obtained compounds represent a mixture of tautomers. |
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A. V. Kamernitskii A. M. Turuta Z. I. Istomina T. M. Fadeeva Ngo Tkhi Mai An 《Russian Chemical Bulletin》1981,30(3):499-503
Conclusions The opening of the three-membered ring of 16, 17-methylenepregn-5-en-3-ol-20-one by nucleophilic reagents in the presence of H2SO4, proceeds regiospecifically, depending on the nature of the nucleophilic reagent.See [1] for Communication 118.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 658–662, March, 1980. 相似文献
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A. A. Akhrem A. V. Kamernitskii V. A. Krivoruchko R. P. Litvinovskaya I. G. Reshetova 《Russian Chemical Bulletin》1976,25(6):1306-1309
| 1. | Together with the cis-hydroxylation of the 16-bond, the hydroxylation of the 3-acetates of the ethyl esters of 24-nor- and 21,24-dinorchola-5,16,20(22)-trien-3-ol-23-oic acids with aqueous KMnO4 inpyridine gives the 3,16, 22-triol 17,20-epoxides and their acetates. |
| 2. | The hydroxylation of the 21,24-dinor analogs with 30% H2O2 solution in the presence of OsO4 leads to a complex mixture of profoundly oxidized reaction products that are identified with difficulty. Only saponification of the carbethoxyl grouping occurs when alkaline H2O2 solution is used for the epoxidation. |
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