Cyclobutene-3,4-dione-intermediates and their use in the preparation of histamine h2-antagonists
申请人:Bristol-Myers Squibb Company
公开号:EP0294615A1
公开(公告)日:1988-12-14
The present invention relates to novel intermediates of the formula
wherein R is lower alkyl or cyclohexyl, and X is hydroxy or a conventional leaving group, and the use thereof in a process for the preparation of certain histamine H₂-antagonists.
本发明涉及式如下的新型中间体
其中 R 为低级烷基或环己基,X 为羟基或常规离去基团,并将其用于制备某些组胺 H₂-拮抗剂的工艺中。
US4927970A
申请人:——
公开号:US4927970A
公开(公告)日:1990-05-22
Substituted 3-cyclobutene-1,2-dione intermediates
申请人:Bristol-Myers Company
公开号:US04927970A1
公开(公告)日:1990-05-22
The present invention relates to novel intermediates of the formula ##STR1## wherein R is lower alkyl or cyclohexyl, and X is hydroxy or a conventional leaving group, and the use thereof in a process for the preparation of certain histamine H.sub.2 -antagonists.