A METHOD OF MANUFACTURING (3R,4S)-L-(4-FLUOROPHENYL)-3-(3S)-3-(4-FLUOROPHENYL)-3- HYDROXYPROPYL)-4-(4-HYDROXYPHENYL)-2-AZETIDINONE AND ITS INTERMEDIATES

摘要

A method of manufacturing (3R,4S)-l-(4-fluorophenyl)-3-[(3S)-3-(4-fluorophenyl)-3- hydroxypropyl)]-4-(4-hydroxyphenyl)-2-azetidinone (ezetimibe) of formula I, in which a protected ketone of general formula II, wherein R stands for a protective group, such as benzyloxycarbonyl, tert-butoxycarbonyl, benzhydryl or trityl, is reduced with asymmetrical borane agents in an inert organic solvent in the temperature range of -30 to +40 °C, and finally the obtained protected alcohol of general formula III, wherein R has the same meaning as above, is deprotected by the action of hydro genolytic or acidic agents in an inert organic solvent.