A series of novel 2-carboxylic acids of the title ring systems has been synthesized from the corresponding 3-acetyl-4H-[1]benzopyran-4-one and benzothiopyran-4-one. These acids were examined for their ability to inhibit the rat passive cutaneous anaphylaxis; the pyridinone carboxylic acids 6 displayed a higher degree of iv and ip anaphylactic activities than their pyranone analogues 5. The potassium
由相应的3-乙酰基-4H- [1]苯并
吡喃-4-酮和苯并
噻喃-4-酮合成了一系列标题环系统的新型2-
羧酸。检查了这些酸抑制大鼠被动皮肤过敏反应的能力。
吡啶酮羧酸6表现出比
吡喃
酮类似物5高的iv和ip过敏活性。
钾盐5a(R6 = K)是唯一表现出中等口服活性的化合物。