申请人:——
公开号:US20040162441A1
公开(公告)日:2004-08-19
A process for the preparation of 2-oxocarboxylic acid esters represented by the following general formula (I), comprising by oxidizing a 2-hydroxycarboxylic acid ester represented by the following general formula (II) in the presence of a nitroxyl radical represented by the following general formula (III), a hypochlorite, a metal bromide and water with the pH of the reaction system being kept within the range of 5 to 7:
1
(I) (II) (III) wherein R
1
and R
2
are each independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or an aralkyl group, which each may be substituted with substituents; and R
3
is a hydrogen atom, an alkoxyl group, an aralkyloxy group, an acyloxy group or a hydroxyl group.
一种制备由下式通式(I)代表的 2-氧代羧酸酯的工艺,包括在由下式通式(III)代表的硝基、次氯酸盐、金属溴和水的存在下,氧化由下式通式(II)代表的 2-羟基羧酸酯,反应体系的 pH 值保持在 5 至 7 的范围内:
1
(I) (II) (III) 其中 R
1
和 R
2
各自独立地为烷基、烯基、炔基、芳基或芳烷基,各自可被取代基取代;以及 R
3
是氢原子、烷氧基、芳氧基、酰氧基或羟基。