Process for preparing salmeterol

Details Process for preparing salmeterol Process for preparing salmeterol

2007-11-13

2007-11-13

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

11128639

ABSTRACT:
A process for the preparation of a compound of formula (I)or a single enantiomer thereof, or a salt or a solvate thereof, wherein W is a chiral auxiliary or hydrogen and P1and P2are each independently selected from hydrogen or a protecting group, which comprises:a)treatment of a compound of formula (II),or a salt or a solvate thereof, wherein W is a chiral auxiliary and P1and P2are each independently chosen from a protecting group, with a compound of formula (III) to form a resulting product,b) treating the resulting product with a reducing agent to form the compound of formula (I), or a single enantiomer thereof, or a salt or a solvate thereof.

REFERENCES:
patent: 0422889 (1991-04-01), None
patent: 0460924 (1991-04-01), None
patent: 2140800 (1984-12-01), None
Hett et al., “Enantioselective synthesis of salmeterol via asymmetric borane reduction,”Tetrahedron Letters35(50):9375-9378 (1994).

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