Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2010-06-21
2011-12-20
Chung, Susannah (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C548S301100
Reexamination Certificate
active
08080670
ABSTRACT:
The present invention relates to a process for the preparation of 2-butyl-3-[[2′-(1H-tetrazol-5-yl)[1,1′-biphenyl]-4-yl]-1,3-diazaspiro[4,4]non-1-en-4-one by reaction of the corresponding nitrile with sodium azide and piperazine or its acid salt.
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P.R. Bernstein and E.P. Vacek, Improved Conditions for the Formation of Tetrazoles, Medicinal Chemistry Department, Synthesis, 1987, 1133-1134.
Bandaru Yugandar Phaniram
Divi Murali Krishna Prasad
Nuthi Surendra Kalyan
Rao Mysore Aswatha Narayana
Caesar Rivise Bernstein Cohen & Pokotilow Ltd.
Chung Susannah
Divi's Laboratories, Ltd.
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