One-Pot Synthesis of Quinoline-2(1H)-thiones from 2-Isocyanostyrenes via Electrocyclic Reaction of the Corresponding 2-Isothiocyanatestyrenes
作者:Kazuhiro Kobayashi、Seiki Fujita、Shuhei Fukamachi、Hisatoshi Konishi
DOI:10.1055/s-0029-1216949
日期:2009.10
The reaction of α-substituted 2-isocyanostyrenes, which could be readily prepared from commercially available 2-aminophenyl ketones or 2-aminobenzonitriles, with sulfur in the presence of a catalytic amount of selenium proceeded smoothly to give the corresponding 2-isothiocyanatestyrenes. The latter spontaneously underwent the electrocyclic reaction to afford 4-substituted quinoline-2(1H)-thiones in one-pot with isolated yields ranging from 37 to 91%.
α-取代的2-异氰基苯乙烯的反应,可以方便地从商业化可得的2-氨基苯基酮或2-氨基苯腈中制备,与硫在催化量硒的存在下顺利进行,生成相应的2-异硫氰酸苯乙烯。后者自发发生电环化反应,形成4-取代的喹啉-2(1H)-硫酮,单锅反应的分离产率范围为37%至91%。