The reaction of isatoic anhydrides with malononitrile in a reaction-inert solvent in the presence of a base to produce 2-amino-3-cyano-4-hydroxy-quinolines and 2-amino-.alpha.,.alpha.-dicyanoacetophenones which are then hydrolyzed and decarboxylated under acid or base conditions to produce 2-amino-4-hydroxy-quinolines, useful as intermediates for preparation of 1-oxo-1H-6-alkoxy-pyrimido[1,2-a]quinoline-2-carboxylic acids and esters of value as antiallergy agents.
在反应惰性溶剂中,在碱的存在下,异唑酸酐与马隆酰腈反应,生成2-
氨基-3-
氰基-
4-羟基-
喹啉和2-
氨基-α,α-二
氰基
苯乙酮,然后在酸性或碱性条件下
水解和脱羧,生成2-
氨基-
4-羟基喹啉,这是制备1-氧代-1H-6-烷氧基-
嘧啶并[1,2-a]
喹啉-2-
羧酸及其酯的中间体,这些化合物可用作抗过敏药物。