Compounds of the formula (I) wherein R2, A are certain substituents, Y is an ester group, a nitrile group or an amido group and Z is O, S or N+R2, and which compounds are, for example, useful as intermediates for pyrazole fungicides, can be prepared by the reaction of a compound of formula R2-C(O)-CH2Y, with an orthoformate HC-(OR3)3 in the presence of a base, especially in the presence of an amine, e.g. triethylamine
式(I)的化合物,其中R2,A是某些取代基,Y是酯基,腈基或酰胺基,Z是O,S或N + R2,例如,作为
吡唑类杀菌剂的中间体有用,可以通过化合物R2-C(O)-CH2Y与正
甲酸酯HC-(OR3)3在碱存在下反应制备,特别是在胺存在下,例如
三乙胺。