Synthetic studies in steroidal sapogenins and alkaloids—X
作者:S.V. Kessar、Y.P. Gupta、M. Singh、R.K. Mahajan
DOI:10.1016/s0040-4020(01)98078-0
日期:——
Michael addition of S and R methyl 5-nitro-2-methylpentonoate to cis-5,17(20)pregnadien 3β-ol-20-one affords adducts from which tomatid-5-ene-3β-ol and solasodine are synthesised by a sequence of selective transformations.