A process for preparing 2-alkylthiomethyl-4-hydroxypyrimidines, known to be useful as intermediates in making insecticides, of the formula ##STR1## in which R.sup.1 is alkyl, R.sup.2 is hydrogen or alkyl, and R.sup.3 is hydrogen, alkyl or alkoxy, or R.sup.2 and R.sup.3 together represent a divalent alkylene radical, comprising reacting a sulphonyloxyacetonitrile of the formula R--SO.sub.2 --O--CH.sub.2 --CN (II) in which R is alkyl, halogenoalkyl or optionally substituted aryl, with methanol or ethanol, reacting the reaction mixture formed with ammonium chloride, reacting the reaction mixture formed with an alkali metal thiolate of the formula R.sup.1 --S.sup..crclbar. Me.sup..sym. (III) in which Me.sup.+ is an alkali metal cation, and, in the presence of a base, with a .beta.-ketocarboxylic acid ester of the formula ##STR2## at a temperature between about -20.degree. and +100.degree. C.
制备2-烷基
硫代甲基-4-
羟基嘧啶的过程,该
嘧啶在制作
杀虫剂的中间体中被认为是有用的,其
化学式为## STR1##
其中R1为烷基,R2为氢或烷基,R3为氢,烷基或烷氧基,或R2和R3共同表示双价烷基链,包括以下步骤:用
甲醇或
乙醇反应式II的磺酰氧基
乙腈,式中R为烷基,卤代烷基或可选取代芳基;将所形成的反应混合物与
氯化铵反应;将所形成的反应混合物与式为R1-S.sup..crclbar. Me.sup..sym. (III)的碱
金属
硫酸盐反应,其中Me.sup.+为碱
金属阳离子;并在碱的存在下,用式为## STR2##的β-
酮羧酸酯在-20℃至+100℃之间的温度下反应。