Process for preparing 1,2,3,9-tetrahydro-9-methyl-3-methylene-4H-carbazol-4-one and ondansetron therefrom
申请人:Gutman Daniella
公开号:US20060041004A1
公开(公告)日:2006-02-23
The present invention provides a rapid, high-yielding process for preparing 1,2,3,9-tetrahydro-9-methyl-3-methylene-4H-carbazol-4-one from 1,2,3,9-tetrahydro-9-methyl-4H-carbazol-4-one without using a secondary amine as a catalyst, and without using glacial acetic acid as a solvent. The present invention further provides a rapid, high-yielding process for preparing ondansetron from 1,2,3,9-tetrahydro-9-methyl-3-methylene-4H-carbazol-4-one without using alumina as a catalyst.
本发明提供了一种快速高产率的方法,用于从1,2,3,9-四氢-9-甲基-4H-咔唑-4-酮制备1,2,3,9-四氢-9-甲基-3-亚甲基-4H-咔唑-4-酮,而无需使用次级胺作为催化剂,也无需使用冰醋酸作为溶剂。本发明还提供了一种快速高产率的方法,用于从1,2,3,9-四氢-9-甲基-3-亚甲基-4H-咔唑-4-酮制备奥替齐特,而无需使用氧化铝作为催化剂。