Convenient synthesis of substituted 3-aminothiophene-2-carbonitriles from α-acetylenic nitriles and their conversion to thieno[3,2-<i>d</i>]pyrimidines
作者:Wu-Yun Ren、Kambhampati V. B. Rao、Robert S. Klein
DOI:10.1002/jhet.5570230631
日期:1986.11
Several novel 2,4,6-trisubstituted thieno[3,2-d]pyrimidines were synthesized from the hitherto unknown 3-amino-5-methyl-(or 5-phenyl)thiophene-2-carbonitriles 7 and 8. o-Aminonitriles 7 and 8 were obtained in a single step by conjugate addition of mercaptoacetonitrile (generated in situ) to substituted acetylenic nitriles 4 and 5 and annelation of the intermediate vinylic thioethers.
从迄今未知的3-氨基-5-甲基-(或5-苯基)噻吩-2-腈7和8合成了几种新颖的2,4,6-三取代噻吩并[3,2- d ]嘧啶。通过将巯基乙腈(原位生成)共轭添加到取代的乙炔腈4和5中,并使中间体乙烯基硫醚脱环,可以一步制得邻氨基甲酸酯7和8。