Novel benzoyl esters of the following formula (I), and acid addition salts thereof,
in which R, and R2 are the same or different and represent a hydrogen atom or a lower alkoxy group, A represents a single bond, a linear or branched lower alkylene group, a lower alkenylene group, R3 and R4 are the same or different and represent a hydrogen atom or a lower alkyl group, or R, and R4 join together to form a lower alkylene group, Rs represents a group of the formula, -X-(CO) n-Y in which X represents a single bond, a linear or branched lower alkylene group or an alkenylene group, n is 0 or I, Y represents a hydrogen atom, a cycloalkyl group, an aryl group, a hydroxyl group, a lower alkoxy group and the like are prepared by reacting para-nitrobenzoic acid or its derivative with a compound of the general formula (III) or its derivative
to obtain a compound of the general formula (IV)
followed by reducing the compound of the formula (IX)
and subjecting the compound (IX) to guanidylation reaction, or by reacting para-guanidinobenzoic derivative with compound (III) or its derivative.
The benzoyl esters have strong anti-trypsin activity, anti-thrombin activity and anticoagulant activity with low toxicity and are useful as a medicine for treatment of pancreatitis and disseminated intravascular coagulation (DIC).
下式(I)的新型苯甲酰酯及其酸加成盐、
其中 R 和 R2 相同或不同,代表氢原子或低级烷氧基;A 代表单键、直链或支链低级亚烷基、低级烯基;R3 和 R4 相同或不同,代表氢原子或低级烷基,或 R 和 R4 连接在一起形成低级亚烷基;Rs 代表式中的一个基团、-
对硝基苯甲酸或其衍
生物与通式(III)化合物或其衍
生物反应,制备
对硝基苯甲酸或其衍
生物,其中 X 代表单键、直链或支链低级亚烷基或烯基,n 为 0 或 I,Y 代表氢原子、环烷基、芳基、羟基、低级烷氧基等。
得到通式(IV)化合物
然后还原通式(IX)化合物
使化合物(IX)发生
胍基化反应,或使
对胍基苯甲酸衍
生物与化合物(III)或其衍
生物发生反应。
苯甲酰
酯类化合物具有很强的抗胰
蛋白酶活性、抗凝血酶活性和抗凝血活性,且毒性低,可作为治疗胰腺炎和弥散性血管内凝血(DIC)的药物。