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US 2020/0347057 A1Published application
SYNTHETIC METHODS FOR PREPARATION OF (S)-(2R,3R,11BR)-3-ISOBUTYL-9,10-DIMETHOXY-2,3,4,6,7,11B-HEXAHYDRO-1H-PYRIDO[2,1,-A]lSOQUINOLIN-2-YL 2-AMINO-3-METHYLBUTANOATE DI(4-METHYLBENZENESULFONATE)
AssigneeNeurocrine Biosciences, Inc.
InventorsKevin McGee, Bin-Feng Li
Life of this patent
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Abstract
Provided herein are processes for the preparation of (S)-(2R,3R,11bR)-3-isobutyl-9,10-dimethoxy-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinolin-2-yl 2-amino-3-methylbutanoate di(4-methylbenzenesulfonate), or a solvate, hydrate, or polymorph thereof.
Claims31
-31. (canceled)
A VMAT2 inhibitor that is (S)-(2R,3R,1bR)-3-isobutyl-9,10-dimethoxy-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinolin-2-yl 2-amino-3-methylbutanoate di(4-methylbenzenesulfonate) prepared by a method comprising the steps of:
- (a) adding p-toluenesulfonic acid to a solution comprising the free base of (S)-(2R,3R,11bR)-3-isobutyl-9,10-dimethoxy-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinolin-2-yl 2-amino-3-methylbutanoate and acetonitrile;
- and
- (b) filtering (S)-2-amino-3-methyl-butyric acid (2R,3R,11bR)-3-isobutyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-yl ester ditosylate salt from the solution.
Dependencies are inferred from the claim text.