Process for preparing diltiazem
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United States of America Patent
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Jul 1, 1997
Grant Date -
N/A
app pub date -
Feb 14, 1996
filing date -
Feb 17, 1995
priority date (Note) -
Expired
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Abstract
A process is provided for preparing cis-(+)-hydroxy-5-[2-(dimethylamine)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-benzothiazepin-4(5H)-one that is a useful intermediate in the preparation of diltiazem. It has been found that the requisite N-alkylation reaction proceeds rapidly and with an excellent yield when the solvent is a mixture of toluene and N-methylpyrrolidin-2-one and the base is finely-divided sodium carbonate under anhydrous conditions. Such diltiazem commonly is used in the treatment of angina pectoris.
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