Thiourea derivatives represented by the formula (I)
wherein R₁ and R₂ are the same or different and each represents a lower alkyl group, or R₁ or R₂ taken together represent a group having the formula -(CH₂)m- in which m is 4 or 5, R₃ represents a lower alkyl group or a C₃-C₆ cycloalkyl group or a group having the formula -(CH₂)ℓ-R₄ in which R₄ is a phenyl, naphthyl, pyridyl, furyl or thienyl group optionally having 1-3 substituents selected from the group consisting of lower alkyl, lower alkoxy, phenoxy, lower alkylthio, hydroxy, halogen, nitro, cyano and trifluoromethyl, and ℓ represents an integer of 0 to 2 and n represents an integer of 1 to 5 or a physiologically acceptable salt thereof.
The compounds of the invention are useful as a therapeutic agent for peptic ulcers which is also effective on prevention of the recurrence after discontinuation of the administration due to the antimicrobial activity against Helicobacter pyroli.
式 (I) 所代表的
硫脲衍
生物
其中 R₁ 和 R₂ 相同或不同,且各自代表低级烷基,或 R₁ 或 R₂ 合在一起代表具有式 -(CH₂)m- 的基团,其中 m 为 4 或 5、R₃ 代表低级烷基或 C₃-C₆ 环烷基或具有式 -(CH₂)ℓ-R₄ 的基团,其中 R₄ 是苯基、
萘基、
吡啶基、
呋喃基或烷基、(CH₂)ℓ-R₄,其中 R₄ 是苯基、
萘基、
吡啶基、
呋喃基或
噻吩基,任选具有 1-3 个取代基,这些取代基选自由低级烷基、低级烷氧基、苯氧基、低级烷
硫基、羟基、卤素、硝基、
氰基和三
氟甲基组成的组,且 ℓ 代表 0 至 2 的整数,n 代表 1 至 5 的整数或其生理上可接受的盐。
本发明的化合物可作为消化性溃疡的治疗剂,由于其对焦化螺旋杆菌的抗菌活性,还可有效防止停药后复发。