Reactions related to coenzyme B12 dependent rearrangements: Metal mediated free radical acyl migrations in methyl and cyclopropyl substituted models
作者:Wayne M. Best、David A. Widdowson
DOI:10.1016/s0040-4020(01)89121-3
日期:1989.1
Free radicals generated from the methylmalonylcoenzyme A mutase model substrates (3) and (4) by chromium (II) reduction, or by pyrolysis of the analogous cobaloximes, underwent [1,2]-migration only in the acyl series (R = Ph, Me) and not the critical ester series (R = OEt, SBu). The mechanism of the migration was implied by incorporation into (4) of the cyclopropyl ring, the opening of which demostrated
甲基丙二酸辅酶A突变酶模型底物(3)和(4)通过还原铬(II)或通过类似钴胺肟的热解生成的自由基仅以酰基系列经历[1,2]迁移(R = Ph, Me),而不是临界酯系列(R = OEt,SBu)。通过掺入环丙基环(4)中暗示了迁移的机理,环丙基环的开口说明了重排的中间体的自由基性质。