申请人:Bayer Aktiengesellschaft
公开号:US04334073A1
公开(公告)日:1982-06-08
Process for the preparation of an alpha-hydroxycarboxylic acid amide compound of the formula ##STR1## wherein R.sup.1 is hydrogen or alkyl; and R.sup.2 and R.sup.3 are individually selected from hydrogen, alkyl, alkenyl, alkynyl, aralkyl, cycloalkyl or aryl, each of which may be optionally substituted, or a nitrogen-containing heterocyclic radical; or R.sup.2 and R.sup.3, together with the nitrogen atom to which they are bonded, represent an optionally benzo-fused monocyclic or bicyclic ring, which ring may be substituted and may be partially unsaturated, which process comprises reacting in a first stage an alpha-halocarboxylic acid amide of the formula ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are identified as above; and Hal is chlorine or bromine, with an alkali metal acetate or alkaline earth metal acetate in the presence of a quaternary ammonium salt at a temperature between 20.degree. and 200.degree. C., and, in a second stage, deacylating the alpha-acetoxycarboxylic acid amide produced, having the general formula ##STR3## in which R.sup.1, R.sup.2 and R.sup.3, are identified as above by reacting said amide III with an alcohol of the general formula R.sup.4 --OH (IV) in which R.sup.4 is alkyl in the presence of a catalytic amount of a catalyst selected from alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal carbonates, and alkaline earth metal carbonates, at a temperature between 20.degree. and 150.degree. C., these compounds are useful as intermediates in the preparation of herbicides, e.g., substituted sulfonyl glycol amides and anilides.
制备α-羟基
羧酸酰胺化合物的过程,其
化学式为##STR1##
其中,R1为氢或烷基;R2和R3分别选自氢,烷基,烯基,炔基,芳基烷基,环烷基或芳基,每个基都可以选择性地被取代,或者是含氮杂环基;或者R2和R3与它们所连接的氮原子一起表示一个可选择性地苯并的单环或双环环,该环可以被取代,可以部分不饱和。该过程包括在第一阶段中,在20℃到200℃的温度下,在季
铵盐的存在下,将
化学式为##STR2##
其中,R1,R2和R3如上所述;Hal为
氯或
溴的α-卤代
羧酸酰胺与碱
金属
乙酸盐或碱土
金属
乙酸盐反应;在第二阶段中,通过在20℃到150℃的温度下,在碱
金属氢氧化物,碱土
金属氢氧化物,碱
金属
碳酸盐和碱土
金属
碳酸盐的催化下,将产生的α-乙酰氧
羧酸酰胺(III)与
化学式为R4-OH(IV)的醇反应,其中R4为烷基,以去酰基化合物(III)。
这些化合物在
除草剂的制备中是有用的中间体,例如取代磺酰基甘
氨酰胺和
苯胺甲酰胺。