Electrophilic Cyclization of 1,6-Dienes Containing an Allylsilane Moiety− Enantioselective Synthesis ofcis- andtrans-γ-Irone
作者:Stephen Beszant、Elios Giannini、Giuseppe Zanoni、Giovanni Vidari
DOI:10.1002/ejoc.200300276
日期:2003.10
the reagent of choice leading to methylenecyclohexane derivatives in good yields and with complete regioselectivity albeit with poor diastereoselectivity. Using this methodology a stereodivergent synthesis of enantiomerically pure (−)-(2S,6R)-cis-γ-irone and (−)-(2S,6S)-trans-γ-irone, two precious aroma constituents, has been accomplished. This represents an innovative approach with respect to previous
在本文中,我们报告了路易斯酸和三氟乙酸汞促进含有烯丙基硅烷部分的 1,6-二烯环化的第一个例子。三氟乙酸汞已被证明是导致亚甲基环己烷衍生物以良好收率和完全区域选择性的首选试剂,尽管非对映选择性较差。使用这种方法,完成了对映体纯 (-)-(2S,6R)-cis-γ-irone 和 (-)-(2S,6S)-trans-γ-irone 这两种珍贵香气成分的立体发散合成。这代表了一种相对于先前γ-铁酮合成的创新方法。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)