Synthesis of Optically Active 5-(<i>tert</i>-Butyldimethylsiloxy)-2-cyclohexenone and Its 6-Substituted Derivatives as Useful Chiral Building Blocks for the Synthesis of Cyclohexane Rings. Syntheses of Carvone, Penienone, and Penihydrone
作者:Georges P-J. Hareau、Masakazu Koiwa、Shinichi Hikichi、Fumie Sato
DOI:10.1021/ja9843122
日期:1999.4.1
Ti(II)-mediated intramolecular nucleophilic acyl substitution reaction and the FeCl3-mediated ring expansion reaction of a 1-hydroxybicyclo[3.1.0]hexane are the key reactions. The enone 1 reacted with higher-order cyanocuprates with excellent diastereoselectivity to afford the trans-addition products, trans-13, in excellent yields. The reaction of 1 with lower-order cyanocuprates proceeded with moderate
光学活性的 5-(叔丁基二甲基甲硅烷氧基)-2-环己烯酮 (1) 及其 6-取代衍生物 2a,b 由现成的光学活性 3-(叔丁基二甲基甲硅烷氧基)-5-己烯酸乙酯 (4) 合成,其中Ti(II)介导的分子内亲核酰基取代反应和FeCl3介导的1-羟基双环[3.1.0]己烷的扩环反应是关键反应。烯酮 1 与具有优异非对映选择性的高级氰铜酸盐反应,以优异的产率提供反式加成产物 trans-13。1 与低级氰铜酸盐的反应以中等至优异的顺式选择性进行,得到顺式 13。用 DBU(1,8-二氮杂双环 [5.4.