Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2006-05-09
2006-05-09
Parsa, J. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
Reexamination Certificate
active
07041845
ABSTRACT:
The invention relates to a process for preparing optically active 5-hydroxy-3-ketoesters of formula A1 or A2,or one of the tautomers thereof,the use thereof for preparing optically active dihydropyrones of formula B,and the use of the dihydropyrones of formula B thus prepared as starting compounds for preparing pharmaceutically active compounds, particularly Tipranavir.
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Copy of International Search Report Reference #PCT/EP 03/13851.
Jaeger Burkhard
Sauter Markus
Schroeder Juergen
Boehringer Ingelheim Pharma GmbH & Co. KG
Devlin Mary-Ellen M.
Morris Michael P.
Parsa J.
Stempel Alan R.
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