申请人:Merrell Dow Pharmaceuticals Inc.
公开号:US04734430A1
公开(公告)日:1988-03-29
A group of variously methyl-substituted[1,2-c:3,4-c']dipyrazoles, cyclohepta[1,2-c:3,4-c']dipyrazoles, and cyclopenta[1,2-c:3,4-c']dipyrazoles useful as bronchodilators are described herein. The compounds are prepared by reacting a 1,3-diketone with hydrazine or methylhydrazine to give tricyclic products optionally followed by catalytic dehydrogenation and/or alkylation with a strong base and methyl iodide to give various other compounds within the scope of the invention.
本文描述了一组不同甲基取代的[1,2-c:3,4-c']二吡唑,环庚[1,2-c:3,4-c']二吡唑和环戊[1,2-c:3,4-c']二吡唑,它们可用作支气管扩张剂。这些化合物通过将1,3-二酮与肼或甲基肼反应制备得到三环产物,随后可选择性地进行催化脱氢和/或强碱和碘甲烷的烷基化反应,得到本发明范围内的各种其他化合物。