中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (20R)-12-Oxo-5α-pregnan-3β,20-diol-3-acetat | 61235-80-1 | C23H36O4 | 376.536 |
—— | 3β-acetoxy-12,12-ethanediyldioxy-5α-pregnan-20-one | 58652-67-8 | C25H38O5 | 418.574 |
—— | 3β-acetoxy-5α-pregn-16-ene-12,20-dione | 2611-38-3 | C23H32O4 | 372.505 |
—— | 3β-acetoxy-16α,17-epoxy-5α-pregnane-11,20-dione | 909-98-8 | C23H32O5 | 388.504 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (20R)-12-Oxo-5α-pregnan-3β,20-diol-3-acetat | 61235-80-1 | C23H36O4 | 376.536 |
—— | 3β,20β-dihydroxy-5α-pregnan-12-one diacetate | 74807-29-7 | C25H38O5 | 418.574 |
—— | 3β-hydroxy-5α-pregnan-12-one | 95118-67-5 | C21H34O2 | 318.5 |
—— | 5α-pregnane-3,12,20-trione | 5224-09-9 | C21H30O3 | 330.467 |
—— | 3β-acetoxy-11α-bromo-20βF-hydroxy-5α-pregnan-12-one | 114999-29-0 | C23H35BrO4 | 455.432 |
—— | 3β,20β-dihydroxy-5α-pregnan-12-one | 53177-71-2 | C21H34O3 | 334.499 |
—— | 3β-acetoxy-5α-12β-14β-dihydroxy-pregnan-20-one | 1325612-19-8 | C23H36O5 | 392.536 |
—— | 3β,20βF-diacetoxy-11α-bromo-5α-pregnan-12-one | 85999-67-3 | C25H37BrO5 | 497.47 |
—— | 3β-acetoxy-12,12-ethanediyldioxy-5α-pregnan-20-one | 58652-67-8 | C25H38O5 | 418.574 |
—— | 3β,20βF-diacetoxy-11β,12β-epoxy-5α-pregnane | 96619-07-7 | C25H38O5 | 418.574 |
—— | 1-[(3R,5S,8R,9S,10S,12R,13S,14S,17S)-12-amino-3-hydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone | 1426309-63-8 | C21H35NO2 | 333.514 |
—— | (12β-tert-butyloxycarbonyl)amino-20-oxo-5α-pregnan-3β-yl acetate | 1426309-60-5 | C28H45NO5 | 475.669 |
It is shown that the ozonolysis of Δ9(11)-12-keto steroids with a trans fusion of rings A and B proceeds in better yields than the corresponding opening of ring C in the sterically more hindered A/B-cis series. The syntheses of 23ξ-bromo-3β-hydroxy-9-oxo-9,12-seco-25-iso-5α,22β-spirostan-12-oic acid and some of its derivatives as well as of 3β,20α-dihydroxy-9-oxo-9,12-seco-12-pregnanoic acid and some of its ester derivatives are reported. It is demonstrated that the reduction with lithium aluminum hydride in tetrahydrofuran of a 12,20-diketone leads predominantly to a 12β,20α-dihydroxy derivative, in contradistinction to the reduction of a 12α-acetoxy-20-ketone, which affords mostly the 20β-alcohol.