α-(Tosylhydrazono)phenylacetyl chloride and N-Monosubstituted thioamides in dry, non-protic solvents and in the presence of Et3N give representatives of the title mesoionic ring system in good to excellent yields; carbene or carbenoid type intermediates are most likely involved in these regiospecific cyclizations.
在干燥的非质子溶剂中和在Et 3 N存在下,α-(
甲苯磺酰
肼基)苯基
乙酰氯和N-单取代的
硫代酰胺以良好至极好的收率代表了标题的中离子环体系;卡宾或类
胡萝卜素类中间体最有可能参与这些区域特异性环化反应。