Process and intermediate for the preparation of terazosin hydrochloride
申请人:Abbott Laboratories
公开号:US05504207A1
公开(公告)日:1996-04-02
A process for the preparation of 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-tetrahydrofuroyl)piperazine hydrochloride (terazosin hydrochloride dihydrate comprises the steps of reacting 4-amino-2-chloro-6,7-dimethoxy-quinazoline with N-(2-tetrahydrofuroyl)piperazine in an anhydrous polar organic solvent in the absence of an added acid scavenger to produce anhydrous 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-tetrahydrofuroyl)piperazine hydrochloride (Form IV) and thereafter converting the product of that step to 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-tetrahydrofuroyl)-piperazine hydrochloride dihydrate.
Terazosin polymorph and pharmaceutical composition
申请人:Abbott Laboratories
公开号:US05362730A1
公开(公告)日:1994-11-08
A process for preparing a novel anhydrous crystalline polymorph of anhydrous 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(tetrahydro-2-furoyl) piperazine monohydrochloride comprises contacting the known amorphous, crystalline dihydrate, or crystalline anhydrous form I of the compound with a polar organic solvent.