Polylithiumorganic compounds. Part 29: C,C Bond cleavage of phenyl substituted and strained carbocycles using lithium metal
作者:Adalbert Maercker、Kristian S. Oeffner、Ulrich Girreser
DOI:10.1016/j.tet.2004.06.105
日期:2004.9
The reaction of phenyl substituted cyclopropanes phenylcyclopropane and 1,1-diphenylcyclopropane, phenyl substituted bicyclobutanes 1-phenylbicyclobutane, 1-methyl-3-phenylbicyclobutane, 1-methyl-2,2-diphenylbicyclobutane, as well as phenyl substituted spiropentanes phenylspiropentane and 1,1-diphenylspiropentane with lithium metal or lithium di-t-butylbiphenyl (LiDBB) was investigated. Under suitable
苯基取代的环丙烷苯基环丙烷和1,1-二苯基环丙烷,苯基取代的双环丁烷1-苯基双环丁烷,1-甲基-3-苯基双环丁烷,1-甲基-2,2-二苯基双环丁烷,以及苯基取代的螺环戊烷苯基螺旋戊烷和1,1的反应-diphenylspiropentane与锂金属或锂二吨研究了丁基丁基联苯(LiDBB)。在所有情况下,在合适的反应条件下和选择溶剂的条件下,均观察到了活化苯基旁边的单键裂解。如此获得的二锂有机化合物足够稳定并且可以被亲电试剂捕获。仅在少数情况下观察到氢化锂的消除是后续反应。应变环系统的相应阴离子为1-lithio-2,2-二苯基环丙烷,1-lithio-3-苯基双环丁烷,1-lithio-3-甲基-2,2-二苯基双环丁烷和1-lithio-4-苯基螺戊烷可以通过溴化锂交换或通过未取代的碳环的金属化获得,其在与锂金属反应时不显示任何裂解。