A new access to trans-syn-trans perhydrophenanthrenic systems. Synthesis of (9βH)-8α-methylpodocarpan-13-one
作者:Jean-Marc Weibel、Denis Heissler
DOI:10.1016/0040-4039(94)85084-4
日期:1994.1
(9βH)-8α-Methylpodocarpan- 13-one has been synthesized from a 9,10-syn bicyclic precursor by a reaction sequence including an intramolecular Horner-Wadsworth-Emmons reaction — to form (9βH)-podocarp-8(14)-en-13-one — and an hydroxy-directed cyclopropanation to introduce the 8-methyl group on the less accessible α side of the molecule.
(9βH)-8α-甲基罗汉松13-one已由9,10-顺式双环前体通过包括分子内Horner-Wadsworth-Emmons反应的反应序列合成-形成(9βH)-罗汉松8(14)- en-13-和-羟基定向的环丙烷化,以在分子的较不易接近的α侧引入8-甲基。