Addition of hydrogen halides to alkylidenecyclopropanes: a highly efficient and stereoselective method for the preparation of homoallylic halides
作者:Amal I Siriwardana、Itaru Nakamura、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(02)02722-3
日期:2003.1
The reaction of alkylidenecyclopropanes with HCl or with HBr proceeds very smoothly at 120°C to produce the corresponding homoallylic halides stereoselectively in good to excellent yields. For example, the reaction of (1-phenylbenzylidene)cyclopropane, (1-butylpentylidene)cyclopropane and octylidenecyclopropane with hydrochloric acid produced the corresponding homoallylic chlorides, 4-chloro-1,1-diphenyl-1-butene
亚烷基环丙烷与HCl或与HBr的反应在120℃下非常顺利地进行,从而以良好至优异的收率立体选择性地产生相应的均烯丙基卤化物。例如,(1-苯基亚苄基)环丙烷,(1-丁基亚戊基)环丙烷和辛叉基环丙烷与盐酸反应生成相应的均烯丙基氯化物4-氯-1,1-二苯基-1-丁烯,4-丁基-1-氯-3-辛烯和(E)-1-氯-3-十一碳烯的产率分别为99%,96%和87%。(1-丁基亚戊基)环丙烷与氢溴酸的反应以95%的产率产生了1-溴-4-丁基-3-辛烯。