Lactone Kinetic Resolution by Acylation - Application to the Enantioselective Synthesis of Estrane Derivatives
作者:Serge Wilmouth、Anne-Catherine Durand、Sarah Goretta、Christophe Ravel、Delphine Moraleda、Michel Giorgi、Hélène Pellissier、Maurice Santelli
DOI:10.1002/ejoc.200500380
日期:2005.11
acylation of an excess of racemic spirolactone 1 (6,9-divinyl-1-oxaspiro[4.4]nonan-2-one) enolate by protected methyl (S)-lactate or (–)-bornyl carbonate occurs with a kinetic resolution. The resulting lactones were alkylated with 1-iodobenzocyclobutenes to afford compounds that serve as precursors to nonracemic steroids such as 11α-alkyloxycarbonyl-11β,13β-(γ-carbolactone)-17β-vinylgonatri-1,3,5(10)-enes
过量的外消旋螺内酯 1 (6,9-divinyl-1-oxaspiro[4.4]nonan-2-one) 烯醇酯被保护的 (S)-乳酸甲酯或 (-)-冰片碳酸酯的酰化以动力学分辨率发生。所得内酯用 1-碘苯并环丁烯进行烷基化,得到可作为非外消旋类固醇前体的化合物,例如 11α-烷氧基羰基-11β,13β-(γ-碳内酯)-17β-vinylgonatri-1,3,5(10)-烯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)