Stereoselective transacetalization of steroidal C-22 acetonide

Details Stereoselective transacetalization of steroidal C-22 acetonide Stereoselective transacetalization of steroidal C-22 acetonide

2005-03-01

2005-03-01

Coleman, Brenda (Department: 1624)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06861521

ABSTRACT:
The present invention is a process for the preparation of rofleponide of formula (II)where the 22R/22S ratio is 90/10 or greater which comprises contacting an acetonide of formula (I)with CH3—CH2—CH2—CHO (III) in the presence of perchloric acid where the concentration of the acetonide (I) is from about 1 g/20 ml to about 1 g/50 ml in the absence of an inert material.

REFERENCES:
patent: 5939409 (1999-08-01), Andersson et al.
patent: 0 262 108 (1988-03-01), None

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