Process for the preparation of (±) 1-3-dioxolanes and...

Details Process for the preparation of (±) 1-3-dioxolanes and... Process for the preparation of (±) 1-3-dioxolanes and...

2005-07-12

2005-07-12

Bernhardt, Emily (Department: 1624)

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C544S374000, C544S392000

Reexamination Certificate

active

06916926

ABSTRACT:
(±) 3-(4-Phenyl-1-piperazinyl)-1,2-propanediol cyclic acetals, a process for the optical resolution thereof and their use as intermediates for the preparation of (−) 3-(4-phenyl-1-piperazinyl)-1,2-propanediol (levodropropizine) and salts thereof are described herein.

REFERENCES:
patent: 4372958 (1983-02-01), Pestellini et al.
patent: 4669911 (1987-06-01), Lundgren et al.
patent: 4699911 (1987-10-01), Borsa et al.
patent: 2004/0038989 (2004-02-01), Allegretti et al.
patent: WO 93/16056 (1993-08-01), None

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