New and Efficient Conversion of Benzoic Acids into Salicylic Acids via Copper Mediated Hydroxylation Process
作者:Olivia Reinaud、Patrice Capdevielle、Michel Maumy
DOI:10.1055/s-1990-26958
日期:——
N-benzoyl-2-methylalanines 3, obtained through condensation of aroyl chlorides 1 with sodium 2-methylalaninate are ortho-hydroxylated by the new Cu(0)/O2/trimethylamine N-oxide system. Acid hydrolysis of the so-obtained salicylamides 4 provides salicylic acids 5 in excellent yield. When the substrate contains three electron-releasing groups the yields are moderate.
N-苯甲酰基-2-甲基丙氨酸3是通过芳酰氯1与2-甲基丙氨酸钠缩合得到的,通过新的Cu(0)/O2/三甲胺N-氧化物体系进行邻位羟基化。如此获得的水杨酰胺4的酸水解以优异的产率提供水杨酸5。当底物含有三个电子释放基团时,产率适中。