Bromine addition to α-(1-hydroxyalkyl)- and α-(1-alkoxy-alkyl)-α,β-unsaturated esters: an approach to hydroxyfimbrolide and bromobeckerelide
作者:Angel Calderón、Josep Font、Pedro de March
DOI:10.1016/s0040-4020(01)89031-1
日期:——
Treatment of (E)-3-bromo-2-[1-[(2-methoxyethoxy)methoxy]butyl]propenoic acid, 16, with two equivalents of strong bases, reaction related with a possible hydroxyfimbrolide and bromobeckerelide synthesis, resulted in the halogen-metal exchange reaction affording the acrylic acid 18, presumably through the generation of dianion 19.
电子贫烯烃,2-(1-羟烷基)-和2-(1-烷氧基烷基)丙酸酯,2b-d和(E)-2-(1-羟乙基)-2-丁烯酸甲酯的常规离子溴化3a,收益率高于80%。用两当量的强碱处理(E)-3-溴-2- [1-[(2-甲氧基乙氧基)甲氧基]丁基]丙酸16,反应可能与羟基双溴化物和溴代贝克莱德合成有关,可能通过生成二价阴离子19进行卤素-金属交换反应,得到丙烯酸18。