1185883-39-9Relevant articles and documents
METHOD FOR PRODUCING EZETIMIBE AND INTERMEDIATE THEREOF
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, (2017/03/08)
PROBLEM TO BE SOLVED: To provide a method for producing ezetimibe that is a cholesterol-lowering agent. SOLUTION: The present invention provides a method for producing ezetimibe (I) that generates intermediate (M1) and eliminates a protecting group. [R1 is a benzyl group and others, R2 is an ether protecting group such as a silyl ether protecting group]. SELECTED DRAWING: None COPYRIGHT: (C)2016,JPOandINPIT
INTERMEDIATES FOR THE PREPARATION OF (3R, 4S)-1-(4-FLUOROPHENYL)-3-[(3S)-3-(4-FLUOROPHENYL)-3-HYDROXYPROPYL)]-4-(4-HYDROXYPHENYL)-2-AZETIDINONE
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, (2011/04/14)
A method for the preparation of (S)-alcohol oxazolidides of general formula II, in which PG represents hydrogen or a hydroxyl protecting group, such as trimethylsilyl, tert-butyldimethylsilyl, benzyloxycarbonyl, tert-butoxycarbonyl, benzyl, benzhydryl or
INTERMEDIATES FOR THE PREPARATION OF (3R, 4S) -1- (4-FLUOROPHENYL) -3- [ (3S) -3- (4-FLUOROPHENYL) -3-HYDROXYPROPYL) ] -4- (4-HYDROXYPHENYL) -2-AZETIDINONE
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Page/Page column 12-13, (2009/10/21)
A method for the preparation of (S)-alcohol oxazolidides of general formula II, in which PG represents hydrogen or a hydroxyl protecting group, such as trimethylsilyl, tert-butyldimethylsilyl, benzyloxycarbonyl, tert-butoxycarbonyl, benzyl, benzhydryl or trityl, in which a ketal oxazolidide of general formula III, where PG has the same meaning as above and R means an alkyl with 1-4 carbon atoms, linear or branched, such as methyl, ethyl, isopropyl or butyl, or R+R together represents a divalent alkyl, or substituted with 1 or 2 alkyl groups, e.g. 1,2-ethylene, 1,2-propylene, 1,2-butylene, 1,3-propylene or 2,2-dimethyl-l,3- propylene, is deprotected by the action of acidic reagents in a mixture of water and a water- miscible solvent in the temperature range of 0 to 100 °C (stage A), and the obtained ketone oxazolidide of general IV, in which PG has the same meaning as above, is reduced with asymmetrical reagents in an inert organic solvent in the temperature range of -30 to +40 °C (stage B).