三氟甲磺酸银促进了N-(2-乙炔基苯基)硫脲的6-exo-dig模式环化反应,这是很容易从邻乙炔基苯基异硫氰酸酯和伯胺获得的,从而提供了2-亚氨基-4-亚甲基-1 H作为唯一产品的-苯并[ d ] [1,3]噻嗪具有极好的收率。仲胺与邻乙炔基苯基异硫氰酸酯在相同条件下反应,生成6-exo和5-endo-dig模式环化产物。
TfOH-promoted transformation from 2-alkynylphenyl isothiocyanates to quinoline-2-thiones or indoles
摘要:
A variety of 4-arylquinoline-2-thiones and 3-arylthieno[2,3-b]indoles were synthesized in high yields via TfOH-promoted tandem Friedel-Crafts alkenylation-cyclization reactions of 2-alkynylphenyl isothiocyanates. (c) 2009 Elsevier Ltd. All rights reserved.