申请人:Janus Farmaceutici S.r.l.
公开号:US05030738A1
公开(公告)日:1991-07-09
To synthesize molecules with antiulcer action, specifically ranitidine, niperotidine and cimetidine, having the formula: ##STR1## wherein R.sub.1 is hydrogen or together with R.sub.2 represents the rest of a cycloaliphatic or heterocyclic optionally substituted ring with 5 or 6 carbon atoms, R.sub.2 represents H, alkyl, alkyl substituted with a simple or substituted aromatic ring or with a single or substituted heterocyclic ring, Ar represents a simple or substituted phenyl group, a simple or substituted heterocyclic aromatic group, N=1, 2, 3, 4, 5 or 6 and X represents CH--NO.sub.2, S, N--C.tbd.N, the compound (II) is prepared through the following process sequence: ##STR2## wherein Z=H, NO.sub.2, halogen and R.sub.3 =--(CH.sub.2).sub.n Ar, --(CH.sub.2).sub.n --SH, --(CH.sub.2).sub.n --S--S--(CH.sub.2).sub.n, --(CH.sub.2).sub.n --S--CH.sub.2 Ar Y being halogen. The urea of formula ##STR3## is converted in a first stage into the corresponding carbodiimide ##STR4## by reaction with triphenylphosphine and bromine in the presence of a strong base and in a second stage is obtained the desired compound by reaction with nitromethane or with a saline derivative of cynamide.
为合成具有抗溃疡作用的分子,具体为雷尼替丁、尼佩罗替丁和西米替丁,具有以下结构式:##STR1##其中R.sub.1为氢或与R.sub.2一起表示具有5或6个碳原子的环脂环或杂环,R.sub.2表示H、烷基、带有简单或取代芳香环的烷基或带有单个或取代杂环的烷基,Ar表示简单或取代的苯基、简单或取代的杂环芳基,N=1、2、3、4、5或6,X表示CH--NO.sub.2、S、N--C.tbd.N,化合物(II)通过以下过程序列制备:##STR2##其中Z=H、NO.sub.2、卤素,R.sub.3=--(CH.sub.2).sub.n Ar、--(CH.sub.2).sub.n --SH、--(CH.sub.2).sub.n --S--S--(CH.sub.2).sub.n、--(CH.sub.2).sub.n --S--CH.sub.2 Ar,Y为卤素。式##STR3##的脲转化为相应的碳二亚胺##STR4##在强碱存在下,通过与三苯基膦和溴的反应,在第一阶段将获得的化合物与硝基甲烷或氰胺的盐衍生物反应以获得所需的化合物。