Synthetic applications of ethyl 3-bromodifluoromethyl-3-benzyloxy-acrylate as a gem-difluorination building-block: Its reactions with aldehyde and epoxide
作者:Weimin Peng、Jingwei Zhao、Shizheng Zhu
DOI:10.1016/j.jfluchem.2005.12.017
日期:2006.3
tetrakis(dimethylamino)ethylene (TDAE) promoted reaction with a limited scope of aldehyde produced Barbier reaction mode product, δ-hydroxy ester, in moderate yield. The reaction of its zinc reagent with styrene oxide resulted in rearrangement of the epoxide to 2-phenyl-acetaldehyde, and then the zinc reagent condensed with this aldehyde to provide the Reformastsy reaction type product, β-hydroxy ester, in low
3-溴二氟甲基-3-苄氧基丙烯酸乙酯作为通用和多功能宝石的合成应用已经研究了将二氟亚甲基亚基引入一些新的羟基酯中的β-二氟化结构单元。发现锌在DMF中与多种醛的锌介导反应可提供高收率的Reformatsky反应模式产物β-羟基酯,而四(二甲基氨基)乙烯(TDAE)促进了反应,但生成的醛范围有限Barbier反应模式产物δ-羟基酯,产率中等。其锌试剂与苯乙烯氧化物的反应导致环氧化物重排为2-苯基乙醛,然后锌试剂与该醛缩合以低收率提供重整反应型产物β-羟基酯。