New Highly Stereoselective Synthesis of (E)-Droloxifene via Selective Protection of 3,4′-Dihydroxybenzophenone and McMurry Reaction
作者:Sylvain Gauthier、Jean-Yves Sancéau、Josée Mailhot、Brigitte Caron、Julie Cloutier
DOI:10.1016/s0040-4020(99)01061-3
日期:2000.1
A new, highly stereoselective synthesis of (E)-droloxifene is reported. Deprotection of 3,4′-dimethoxybenzophenone and selective pivaloylation of the 3′-phenolic position gave 4-hydroxy-3′-(trimethylacetoxy)benzophenone. A McMurry reaction between the preceding benzophenone and propiophenone gave the (E)-olefin as a major product (14:1 E/Z ratio in crude reaction), which was then alkylated with 2-dimethylaminoethyl
报道了一种新的高度立体选择性的(E)-多洛昔芬合成。3,4'-二甲氧基二苯甲酮的脱保护和3'-酚位置的选择性聚乙烯醇缩合得到4-羟基-3'-(三甲基乙酰氧基)二苯甲酮。前述二苯甲酮和丙苯酮之间的McMurry反应得到了主要产物(E)-烯烃(粗制反应中E / Z比为14:1 ),然后将其与2-二甲基氨基乙基氯烷基化并脱保护得到(E)-屈洛昔芬的E / Z比> 100:1 (5步,13%)。尝试使用这种策略作为获得(Z)-droloxifene的合适的立体选择性方法并不成功。