C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 501/59 (2006.01) C07D 501/00 (2006.01) C07F 7/10 (2006.01)
Patent
CA 2093507
X-8728(EPO) Abstract A process for the conversion of a 4-chlorosulfonyl azetidinone (a) to a 3-hydroxy-3-cephem-sulfoxide ester (d) by subjecting an intermediate comprising a tin containing Lewis acid-type Fiedel-Crafts catalyst and 3- exomethylene cepham to ozonolysis.
Eli Lilly And Company
Gowling Lafleur Henderson Llp
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