Stereoselection in the Prins-Pinacol Synthesis of 2,2-Disubstituted 4-Acyltetrahydrofurans. Enantioselective Synthesis of (−)-Citreoviral
作者:Naoyuki Hanaki、J. T. Link、David W. C. MacMillan、Larry E. Overman、William G. Trankle、Julie A. Wurster
DOI:10.1021/ol991315q
日期:2000.1.1
[reaction: see text] The condensation of allylic diols with unsymmetrical ketones proceeds with high stereoselection to form 2,2-disubstituted 4-acyltetrahydrofurans when the alpha-substituents of the ketone differ substantially in size. A Prins-pinacol condensation of this type is the central strategic step in an enantioselective synthesis of (-)-citreoviral.
[反应:见正文]当酮的α-取代基大小相差很大时,烯丙基二醇与不对称酮的缩合以高立体选择性进行,形成2,2-二取代的4-酰基四氢呋喃。这种类型的Prins-频哪醇缩合是(-)-柑橘病毒的对映选择性合成的核心战略步骤。