Facile one-pot synthesis of unsymmetrical ureas, carbamates, and thiocarbamates from Cbz-protected amines
作者:Hee-Kwon Kim、Anna Lee
DOI:10.1039/c6ob01290f
日期:——
A novel one-pot synthesis of unsymmetrical ureas, carbamates and thiocarbamates from Cbz-protected amines has been developed. In the presence of 2-chloropyridine and trifluoromethanesulfonyl anhydride, isocyanates are generated in situ, which facilitate rapid reaction with amines, alcohols, and thiols to afford the corresponding ureas, carbamates and thiocarbamates in high yields.
已开发出一种由Cbz保护的胺合成不对称
脲,
氨基甲酸酯和
硫代
氨基甲酸酯的新型一锅法。在2-
氯吡啶和三
氟甲磺酰酐的存在下,原位生成
异氰酸酯,这有助于与胺,醇和
硫醇快速反应,从而以高收率提供相应的
脲,
氨基甲酸酯和
硫代
氨基甲酸酯。