申请人:Japan Tobacco, Inc.
公开号:US05204462A1
公开(公告)日:1993-04-20
4H-3,1-benzoxazin-4-one derivatives represented by formula (I) below: ##STR1## wherein R.sup.1 represents a lower alkyl group, R.sup.2 represents a lower alkyl group, a lower alkylthioalkyl group, or a lower alkanesulfinylalkyl group, R.sup.3 represents a hydrogen atom a hydroxyl group, a lower alkoxy group, or a lower acyloxy group, X represents an amino acid residue selected from the group consisting of alanine, valine, and phenylalanine, n represents an integer of 0, 1, or 2, and Y means a substituent selected from the group consisting of an alkanoyl group having 2 to 6 carbon atoms which may be substituted by a phenyl group, a benzyloxycarbonyl group, a lower alkoxycarbonyl group, a cinnamoyl group, and a methoxysuccinyl group. These derivatives exhibit a strong serine protease inhibiting effect, and are useful as effective components of agents for preventing and curing diseases caused by the excessive effect of serine proteases, e.g., pneumonia, pulmonary emphysema, fibroid lung, bronchitis, arthritis, pancreatitis, nephritis, shock, sepsis, and arteriosclerosis.
以下是式子(I)所代表的4H-3,1-苯并噻唑-4-酮衍生物:
其中,R1代表较低的烷基,R2代表较低的烷基,较低的硫代烷基或较低的烷基磺酰基烷基,R3代表氢原子,羟基,较低的烷氧基或较低的酰氧基,X代表从丙氨酸,缬氨酸和苯丙氨酸中选择的氨基酸残基,n代表0、1或2的整数,Y代表从2到6个碳原子的脂肪酰基,可以被苯基取代,苄氧羰基,较低的烷氧羰基,肉桂酰基和甲氧基琥珀酰基等取代基。这些衍生物表现出强烈的丝氨酸蛋白酶抑制作用,并且可作为预防和治疗由丝氨酸蛋白酶过度作用引起的疾病的有效成分,例如肺炎,肺气肿,纤维性肺,支气管炎,关节炎,胰腺炎,肾炎,休克,败血症和动脉硬化等。