Preparation and reactions of novel cyclic β-oxosulphonium salts obtained by the acid-induced cyclisation of 1-diazo-ω-phenylthio-2-alkanones
作者:William T. Flowers、Ana M. Freitas、Geoffrey Holt、Stuart C. Purkiss
DOI:10.1039/p19810001119
日期:——
All the reactions of the salt (2b) with nucleophiles gave either 1-phenylthiobut-3-en-2-one (11) or products of its Michael addition. Salts (2c) and (2d) with sodium methoxide in methanol provide, respectively, methyl ω-phenylthio-butanoate and -pentanoate in a process that involves the loss of a methylene group. These and other reactions are considered to proceed via ylide intermediates; the intermediate
与高氯酸一起,重氮酮PhS [CH 2 ] n COCHN 2(1a)–(1d)得到相应的环状β-氧代磺酸盐(2a)–(2d);类似地制备(2d)的对氯苯基类似物。盐(2a),(2c)和(2d)与三苯基膦在C(2)反应生成无环phospho盐(3a),(3c)和(3d),并与O-乙基二硫代碳酸钾相似给出相应的无环O-二硫代碳酸乙酯(3f),(3g)和(3h)。盐(2b)与亲核试剂的所有反应均产生1-苯基硫代丁-3-烯-2-酮(11)或其迈克尔加成产物。与甲醇钠在甲醇中的盐(2c)和(2d)在涉及亚甲基损失的过程中分别提供了ω-苯硫基丁酸甲酯和-戊酸甲酯。这些和其他反应被认为是通过叶立德中间体进行的。分离了通过(2d)的去质子化而衍生的中间体,而将来自(2c)的去质子化的中间体重排得到3-苯基硫代环戊酮。