Treatment of 25R and 25S-23E-benzylidenespirostanes with NaBH3CN in acetic acid produced the hydride addition at either C-23 (normal course) or C-23′ (abnormal course) leading to 23E-benzylidenefurostanes and 23R-benzylspirostanes. In the case of the 25S-23E-benzylidenespirostane a minor amount of a 23R-benzylfurostane produced by the over-reduction of the side chain was isolated.
在
乙酸中用NaBH 3 CN处理25 R和25 S -23 E-亚
苄基螺杂烷烷在C-23(正常过程)或C-23'(异常过程)处生成
氢化物,生成23 E-亚
苄基呋喃酮和23 R -
苄基螺烷。在25 S -23 E-苄叉亚
氨基甾烷烷的情况下,通过侧链的过度还原产生了少量的23 R-
苄基呋喃烷。