A highly stereoselective preparation of CF3-substituted 1-aryl-1,2-diphenylethenes: application to the synthesis of panomifene
作者:Myong Sang Kim、In Howa Jeong
DOI:10.1016/j.tetlet.2005.03.117
日期:2005.5
sulfide 3a was prepared stereoselectively in 77% yield from the reaction of 2 with phenyllithium at room temperature for 5 h. Oxidation of 3a with MCPBA afforded the corresponding vinyl sulfone 4a, in which (E)-4a can be crystallized in a mixture of CH2Cl2 and hexane. The addition–elimination reaction of (E)-4a with phenyllithium having substituents on the benzene ring provided 5a–j in 51–82% yields stereospecifically
β-CF 3 -α,β二苯基硫醚3A是立体选择性地在从反应收率77%制备2与苯基锂,在室温下搅拌5小时。用MCPBA氧化3a得到相应的乙烯基砜4a,其中(E)-4a可以在CH 2 Cl 2和己烷的混合物中结晶。(E)-4a与苯环上带有取代基的苯基锂的加成-消除反应提供了5a - j,其立体收率为51-82%。同样,(E)-图4a与p在12-冠-4(20摩尔%)的在-10℃的存在下,随后缓慢升温至室温-chloroethoxyphenyllithium,导致形成相应的panomifene前体6以82%的产率。