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。