Method for preparing silodosin and intermediate thereof
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United States of America Patent
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Aug 29, 2017
Grant Date -
Oct 20, 2016
app pub date -
Oct 20, 2014
filing date -
Dec 9, 2013
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Abstract
Provided is a method for preparing silodosin. Also provided is a method for preparing an organic acid salt of a new intermediate 3-(7-cyano-5-((R)-2-((R)-1-phenylethylamino)propyl)-1-hydrogen-indolyl) propyl alcohol (ester or ether), and a new intermediate 3-(7-cyano-5-((R)-2-(((R)-1-phenethyl)(2-(2-(trifluoroethoxy)phenoxy) ethyl)amino)propyl)1-hydrogen-indolyl)propyl alcohol (ester or ether) and a salt thereof. The method has the following advantages: raw materials are cheap and easy to obtain, the operation is simple, the intermediate and product are easy to purify, the yield is high, and the method is applicable to industrial production.
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