Method of preparation of...

Details Method of preparation of... Method of preparation of...

2005-02-03

2009-12-29

O'Sullivan, Peter G (Department: 1621)

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

Organic compounds

Amino nitrogen containing

Reexamination Certificate

active

07638649

ABSTRACT:
A method of preparation of (R)-(−)-5-(2-aminopropyl)-2-methoxybenzenesulfonamide of formula I and its use for production tamsulosin. A protective group is introduced to N-[(1R)-2(4-methoxyphenyl)-1-methylethyl]-N-[(1R)-1-phenylethyl)]amine and the resulting amide of formula IX is chlorosulfonated and the resulting sulfochloride is converted to a sulfonamide of formula X, from which the compound of formula I is obtained by hydrogenation.

REFERENCES:
patent: 397 960 (1994-08-01), None
patent: 0 257 787 (1988-03-01), None
patent: 02 068382 (2002-09-01), None

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