Carboxylic acid-catalyzed one-pot synthesis of cyanoacetylureas and their cyclization to 6-aminouracils in guanidine ionic liquid
作者:Sunil S. Chavan、Rupesh U. Shelke、Mariam S. Degani
DOI:10.1007/s00706-012-0810-9
日期:2013.3
AbstractA novel, one-pot, carboxylic acid-catalyzed synthesis of cyanoacetylureas via in situ generated ureas and their cyclization to 6-aminouracils in the presence of the guanidine-based ionic liquid 1,1,3,3-tetramethylguanidine lactate [TMG][Lac] is described. The ureas were synthesized from amines and potassium cyanate, which on reaction with cyanoacetic acid in the presence of acetic anhydride
摘要在基于胍的离子液体1,1,3,3-四甲基胍乳酸盐[TMG]存在下,通过原位产生的脲经原位生成的脲及其环化成6-氨基尿嘧啶的新颖的一锅羧酸催化合成[ [描述]。脲是由胺和氰酸钾合成的,它们与氰基乙酸在乙酸酐存在下在同一罐中反应,得到氰基乙酰脲,然后在[TMG] [Lac]中作为溶剂和催化剂进行环化,得到6-氨基尿嘧啶。一锅法合成氰基乙酰脲,高效快速的环化反应,更高的收率,更短的反应时间,简便的后处理步骤以及离子液体的可回收性是该步骤的优势。 图形概要