Reactions of arylazosulfones with the conjugate bases of active-methylene compounds
作者:Carlo Dell'Erba、Marino Novi、Giovanni Petrillo、Cinzia Tavani
DOI:10.1016/0040-4020(95)00113-m
日期:1995.3
The reaction between arylazo p-tolyl sulfones la-f (Ar-N=N-SO2p-Tol) and the potassium salts of some active-methylene compounds (CH2XY: X, Y = CN, COOEt) represents an example of unprecedented behaviour of azosulfones and effectively leads, depending on the nucleophile, to either unsymmetrical (6–8) or symmetrical (9) tetrasubstituted ethylenes. Of particular interest is the possibility to synthesize
芳基偶氮对甲苯基砜la-f(Ar-N = N-SO 2 p - Tol)与某些活性亚甲基化合物(CH2XY:X,Y = CN,COOEt)的钾盐之间的反应代表了前所未有的例子偶氮砜的行为,并根据亲核试剂有效地导致不对称(6-8)或对称(9)四取代的乙烯。特别令人感兴趣的是,可以在高收率和温和条件下合成极性乙烯lArNHCX = CXY:X = Y = CN(6)或X = COOEt,Y = CN(7)],其中有些不容易获得。实验证据支持了涉及连续缩合过程的机理。