The conversion of 2-(4-chloro-5H-1,2,3-dithiazolylideneamino)benzonitriles into 3-aminoindole-2-carbonitriles using triphenylphosphine
作者:Sophia S. Michaelidou、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2009.07.064
日期:2009.10
2-(4-Chloro-5H-1,2,3-dithiazolylideneamino)benzonitrile 1a reacts with triphenylphosphine (4 equiv) in the presence of water (2 equiv) to afford anthranilonitrile 2a, 3-aminoindole-2-carbonitrile 3a and (2-cyanoindol-3-yl)iminotriphenylphosphorane 4a, together with triphenylphosphine sulfide and oxide. The use of polymer bound triphenylphosphine provides cleaner reaction mixtures. 2-(4-Chloro-5H-1
2-(4-氯-5 H -1,2,3-二噻唑基亚氨基氨基)苄腈1a在水(2当量)存在下与三苯基膦(4当量)反应生成蒽腈2a,3-氨基吲哚-2-腈3a和(2-氰基吲哚-3-基)亚氨基三苯基膦4a以及三苯基膦硫化物和氧化物。聚合物键合的三苯膦的使用提供了更清洁的反应混合物。2-(4-氯-5 H -1,2,3-二噻唑基亚氨基)-4,5-二甲氧基苄腈1h经三苯膦处理后不生成相应的吲哚,但生成6,7-二甲氧基喹唑啉-2-腈5(15% )和2-氰基-4,5-二甲氧基氰基硫代甲酰苯胺6(36%)。总共准备并完全表征了七个新的3-氨基吲哚-2-腈3a – g。