Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen bonded directly to ring carbon of the purine ring...
Reexamination Certificate
2006-07-11
2006-07-11
Berch, Mark L. (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen bonded directly to ring carbon of the purine ring...
C544S272000, C544S271000, C544S273000, C548S326500, C560S035000
Reexamination Certificate
active
07074923
ABSTRACT:
A process for preparing xanthine phosphodiesterase V inhibitors, and compounds utilized in said process. The process includes a five-step methodology for efficient synthesis of Compound 5 without intermediate purifications or separations, a dihalogenation step to synthesize Compound 7, and a coupling reaction to produce Compound 9
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Dahanukar Vilas A.
Nguyen Hoa N.
Orr Cecilia A.
Zavialov Ilia A.
Zhang Fucheng
Berch Mark L.
Fischer H. Eric
Reinhardt Gerard E.
Schering Corporation
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