A Convenient One-Pot Method for the Synthesis of N-Methoxy-N-methyl Amides from Carboxylic Acids
作者:Joong-Gon Kim、Doo-Ok Jang
DOI:10.5012/bkcs.2010.31.01.171
日期:2010.1.20
reaction temperatures, low yields, multi-step reactions, or tedious work-up procedures.We report a mild and convenient one-pot method for the synthesis of Weinreb amides from carboxylic acids employing trichloroacetonitrile (TCA) and triphenylphosphine (TPP). We first presumed that carboxylic acid chlorides formed
A Convenient Method for the Conversion of Hindered Carboxylic Acids to <i>N</i>-Methoxy-<i>N</i>-methyl (Weinreb) Amides
作者:Jacqueline C. S. Woo、Erik Fenster、Gregory R. Dake
DOI:10.1021/jo048385h
日期:2004.12.1
The conversion of stericallyhindered carboxylic acids to N-methoxy-N-methyl amides can be efficiently carried out with 1.1 equiv of methanesulfonyl chloride, 3 equiv of triethylamine, and 1.1 equiv of N-methoxy-N-methylamine. Yields for this process range from 59% to 88%. The major byproduct in these reactions, N-methoxy-N-methylmethanesulfonamide, can be removed by placing the product mixture under