Structures of 2:1 molar adducts from dimethyl acetylenedicarboxylate with thiazoles and related heterocycles
作者:Patrick J. Abbott、R. Morrin Acheson、Ulli Eisner、David J. Watkin、J. Robert Carruthers
DOI:10.1039/c39750000155
日期:——
Thiazoles and related heterocycles with dimethyl acetylenedicarboxylate combine directly to give 1:2 molar adducts [e.g. (12)], and also two types of isomeric products which can be formed from the initial adducts by a [1,5] sigmatropic hydrogen shift [e.g. (4)] or by molecular rearrangement [e.g. (11)]; the structures were established by 13C n.m.r. spectroscopy and for the pyridothiazoles (11) and
噻唑和相关的杂环与乙炔二甲酸二甲酯直接结合,可产生1:2摩尔加合物[例如(12)],也可通过初始加合物通过[1,5]σ氢位移形成两种类型的异构体产物[例如] (4)]或通过分子重排[例如(11)];通过13 C nmr光谱确定了结构,并通过X射线晶体学证实了吡啶噻唑(11)和(12)的结构。