Invention Grant
- Patent Title: Process for the preparation of substituted benzimidazoles
- Patent Title (中): 制备取代苄基咪唑的方法
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Application No.: US40540073Application Date: 1973-10-11
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Publication No.: US3896142APublication Date: 1975-07-22
- Inventor: DRANSCH GUNTHER , HORLEIN GERHARD
- Applicant: HOECHST AG
- Assignee: Hoechst AG
- Current Assignee: Hoechst AG
- Priority: DE2250469 1972-10-14
- Main IPC: C07D233/48
- IPC: C07D233/48 ; C07D235/32 ; C07D49/38
Abstract:
A process for the preparation of 2-benzimidazole-carbamic acid alkyl and benzyl esters or the salts thereof, which comprises converting 2-amino-benzimidazoles with bases to their alkali metal or alkaline earth metal salts reacting these compounds with carbonic acid dialkyl or dibenzyl esters with exclusion of water, and optionally converting the 2-benzimidazole carbamate salts obtained to the free 2-benzimidazole-carbamic acid esters by acidification.
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