Potassium Hydroxide → (2S-cis)-5-(2-(Dimethylamino)ethyl)-2,3-dihydro-3-hydroxy-2-(4-methoxyphenyl)-1,5-benzothiazepin-4(5H)-one monohydrochloride

Participants

Reaction Conditions

Reaction Steps

A mixture of 30.1 g of cis-(+)-2-(4-methoxyphenyl)-3-hydroxy-2,3-dihydro-1,5-benzothiazepine-4(5H)-one, 17.8 g of 2-(dimethylamino)ethyl chloride hydrochloride, 13.7 g of 96% potassium hydroxide, 60 g of sodium sulfate and 300 ml of acetone is stirred at 50° C. for 7 hours. After the reaction is completed, the mixture is filtered to remove inorganic materials and the filtrate is condensed. The residue is dissolved in ethanol. After cooling the solution, 10% HCl/ethanol is added thereto. The crystalline precipitates are collected by filtration and then dried. 35.1 g of cis-(+)-2-(4-methoxyphenyl)-3-hydroxy-5-[2-(dimethylamino)ethyl]-2,3-dihydro-1,5-benzothiazepine-4(5H)-one hydrochloride are thereby obtained. Yield: 86.2%

Provenance & Evidence