作者:C. De Tollenaere、L. Ghosez
DOI:10.1016/s0040-4020(97)10126-0
日期:1997.12
1,2-Difluorovinylphenylsulfone 5 was conveniently prepared in three steps from chlorotrifluoroethylene. Both E and Z isomers of 5 gave excellent yields of [4+2] cycloadducts with cyclopentadiene. The E isomer reacted with high kinetic exo selectivity. 1,2-Difluorovinylphenylsulfone 5 did not give cycloadducts with highly polar and reactive dienes. Only complex mixtures were obtained. This was assigned
由三氟氯乙烯方便地以三步制备1,2-二氟乙烯基苯基砜5。既Ë和ž的异构体5,得到[4 + 2] cycloadducts与环戊二烯的产率优异。该é异构体与高动力反应外选择性。1,2-二氟乙烯基苯砜5不会产生具有高极性和反应性二烯的环加合物。仅获得复杂的混合物。这被归因于添加消除序列产生的竞争途径。由这样的加成-消除序列产生的产物获自代表性亲核试剂。