A novel o-quinodimethane strategy for an active metabolite of vitamin D3. A total synthesis of 25-hydroxy Windaus-Grundmann ketone
作者:Hideo Nemoto、Masahiro Ando、Keiichiro Fukumoto
DOI:10.1016/s0040-4039(00)97025-4
日期:——
A highly diastereoselective totalsynthesis of 25-hydroxy Windaus-Grundmann ketone (2) was achieved via a novel regiocontrolled CC bond formation by an intramolecular epoxide ring opening reaction of the bissulfonyl epoxide (19) as a key step, which was derived stereoselectively by the thermolysis of olefinic benzocyclobutene (8) as a key step.
(+)-19-Nordeoxycorticosterone (1) has been synthesised by A-ring construction of the (+)-A-nor-B-trienic steroid (2) obtained enantioselectively from the alkenic benzocyclobutene (12).