The vicinal effect between the keto groups of the two cholestane-4,7-diones epimeric at C-5 is small for the 5α-compound 3, but appreciable for the 5β-isomer 2. The synthesis and chiroptical properties of some lactones and lactames of 5-carboxy-5α-cholestane are described.
对于5α-化合物3,两个胆甾烷-4,7-二酮异构体在C-5处的酮基之间的邻位作用较小,但对于5β-异构体2则明显。描述了5-羧基-
5α-胆甾烷的一些内酯和内酰胺的合成和手性。