申请人:SMITH KLINE & FRENCH LABORATORIES
LIMITED
公开号:EP0007232A1
公开(公告)日:1980-01-23
Isoureas and isothioureas which are histamine H2- antagonists and also have histamine H1-antagonist activity and antiinflammatory activity having the structure
in which R' and R2 are hydrogen, lower alkyl, or together with the carbon and two nitrogen atoms shown form a dihydroimidazolyl or tetrahydropyrimidyl group, Y is sulphur or oxygen, n is from 3 to 8, X is oxygen or sulphur, Z is hydrogen or lower alkyl, A is C1-C3 alkylene or -(CH2)pW(CH2)q- where W is oxygen or sulphur and the sum of p and q is 1 to4, and B is methyl, cycloalkyl, heteroaryl, aryl or, when A is alkylene, hydrogen, are prepared by a process in which a compound of structure
where D is HY- or a leaving group is reacted with:
(a) when D is HY-, an isothiourea
where A is lower alkyl or aryl (lower alkyl), or a cyanamide R1HNCN or a carbodiimide R1N=C=NR2 or
(b) when D is a leaving group, a urea or thiourea
or, when Y is oxyen a compound of structure
where G is a lower alkylthio, chlorine, bromine or NO2NH-, is reacted with an isothiourea of Structure
异脲类和异硫脲类是组胺 H2-拮抗剂,也具有组胺 H1-拮抗剂活性和抗炎活性,其结构为
其中 R' 和 R2 为氢、低级烷基或与所示的碳原子和两个氮原子一起形成二氢咪唑基或四氢嘧啶基,Y 为硫或氧,n 为 3 至 8,X 为氧或硫,Z 为氢或低级烷基、A 为 C1-C3 亚烷基或-(CH2)pW(CH2)q-,其中 W 为氧或硫,p 和 q 之和为 1 至 4,B 为甲基、环烷基、杂芳基、芳基或(当 A 为亚烷基时)氢,通过以下工艺制备结构如下的化合物
其中 D 为 HY- 或离去基团,并与之反应:
(a) 当 D 为 HY- 时,异硫脲
其中 A 为低级烷基或芳基(低级烷基),或氰胺 R1HNCN 或碳化二亚胺 R1N=C=NR2 或
(b) 当 D 为离去基团时,脲或硫脲
或当 Y 为氧烯时,结构如下的化合物
其中 G 为低级烷硫基、氯、溴或 NO2NH- 时,与结构式如下的异硫脲反应