Method for preparing risperidone

Details Method for preparing risperidone Method for preparing risperidone

2007-04-10

2007-04-10

Rao, Deepak (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

C514S259100, C546S232000

Reexamination Certificate

active

10531299

ABSTRACT:
Risperidone is prepared in a high yield by reacting 2,4-difluorophenyl(4-piperidinyl)methanone oxime hydrochloride and 3-(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one in an aqueous alkali hydroxide solution having an alkali hydroxide concentration in the range of 20 to 40%.

REFERENCES:
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patent: 0196132 (1986-10-01), None
patent: 2050069 (1994-05-01), None
patent: 2 074 966 (1995-09-01), None
patent: 1996-0009435 (1999-01-01), None
patent: WO 0185731 (2000-05-01), None
patent: WO 0212200 (2002-02-01), None
patent: WO 03/042242 (2003-05-01), None

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