Treatment of the (Z)-isomers 6 and 7 of the four isomeric 16-acetoxy-17-hydroxyimino-steroids 6–9 with DCC/DMSO/CF3COOH (Moffat fragmentation of oximes) yielded the seco-α-acetoxy-nitriles 10 and 11, respectively, while similar treatment of both (E)-isomers 8 and 9 gave the formyl-carbonitrile 14. The mechanism of these fragmentations is discussed. 13C-NMR. data of oximes are presented which show the
所述的治疗(Z) -异构体6和7的四个异构体16-乙酰氧基-17-羟基亚
氨基类
固醇6-9用
DCC /
DMSO / CF 3 COOH(莫法特
肟的碎裂),得到开环-α
乙酸基腈分别参见图10和11,同时对(E) -异构体8和9的类似处理给出了甲酰基-甲腈14。讨论了这些断裂的机理。13 C-NMR。给出了
肟数据,这些数据表明了γ-乳胶 效应与σ(CH)键极化有关。