4-Dimethyl-17-nor-5α,13α-androst-8-en-16-one (9) and 3β-acetoxy-4,4-dimethyl-17-nor-5α-androst-8-en-16-one (19) have been prepared by the acid-catalysed intramolecular cyclization of 16-diazopimar-8(14)-en-15-one (7) and 3β-acetoxy-16-diazoisopimar-7-en-15-one (16) prepared from pimara-8(14),15-diene (5) and isopimara-7,15-dien-3β-ol acetate (10), respectively.
4,4-Dimethyl-17-nor-5α,13α-androst-8-en-16-一(9)和3β-乙酰氧基-4,4-二甲基-17-nor-5α-androst-8-en-16 -(19)已通过酸催化16-重氮杂8(14)-en-15-一(7)和3β-乙酰氧基-16-重异异7-7-en-15-one(7)的分子内环化反应制得(19) 16)分别由pimara-8(14),15-二烯(5)和isopimara-7,15-dien-3β-ol
乙酸酯(10)制备。