Efficient and selective N-alkylation of carbamates in the presence of Cs2CO3 and TBAI
摘要:
Mild and selective N-alkylation of carbamates was carried our in the presence of cesium carbonate, tetra-butylammonium iodide (TBAI), and a halide. This protocol was highly selective and efficient, offering aliphatic and aromatic N-alkyl carbamates exclusively in high yields. (C) 2001 Published by Elsevier Science Ltd.
Efficient Cs2CO3-promoted solution and solid phase synthesis of carbonates and carbamates in the presence of TBAI
作者:Ralph N Salvatore、Feixia Chu、Advait S Nagle、Elona A Kapxhiu、Richard M Cross、Kyung Woon Jung
DOI:10.1016/s0040-4020(02)00286-7
日期:2002.4
Novel solution and solid-phase methods for the synthesis of carbonates and carbamates were developed using cesium bases and TBAI via a three-component coupling. Cesium carbonate not only promoted successful carbonylations of alcohols and carbamations of amines, but also suppressed common side reactions traditionally seen using existing protocols. Various alcohols and amines were examined, using a wide
Efficient Carbamate Synthesis via a Three-Component Coupling of an Amine, CO<sub>2</sub>, and Alkyl Halides in the Presence of Cs<sub>2</sub>CO<sub>3</sub> and Tetrabutylammonium Iodide
作者:Ralph N. Salvatore、Seung Il Shin、Advait S. Nagle、Kyung Woon Jung