Direct Synthesis of Esters and Amides from Unprotected Hydroxyaromatic and -aliphatic Carboxylic Acids
作者:Alan R. Katritzky、Sanjay K. Singh、Chunming Cai、Sergey Bobrov
DOI:10.1021/jo052293q
日期:2006.4.1
activation of hydroxy-substituted carboxylic acids using benzotriazole chemistry without prior protection of the hydroxy substituents is presented. The N-acylbenzotriazole intermediates 2a−g, 6a−d, and 9a−c have been used for high-yielding synthesis of both aliphatic (3a−l) and aromatic (7a−h, 10a−f) hydroxy carboxamides. High yields of aromatic hydroxy esters 12a−h and 13a−i were obtained using either
提出了一种在不事先保护羟基取代基的情况下使用苯并三唑化学方法活化羟基取代的羧酸的简便方法。所述Ñ -acylbenzotriazole中间体2A -克,6A - d,和图9a - ç已被用于脂族的高产合成(图3a -升)和芳族(图7a - ħ,10A - ˚F羟基羧酰胺)。芳族羟基酯12a - h和13a - i的高收率使用在中性微波条件下的纯醇或亲核醇盐和中间体N-(芳基)苯并三唑可制得苯二酚。在脂族羟基酯11a,b和硫醇酸酯11e - g的情况下,从中间体2a - c获得中等产率。