Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-02-07
1977-02-08
Torrence, Dolph H.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2602391, 260243C, 260260, 260281GP, 2603095, 26032637, 424246, C07D20712, C07D20948
Patent
active
040072029
ABSTRACT:
Novel azetidine derivatives of the formula ##STR1## wherein R.sub.1 is an acylamido group, R.sub.2 is selected from the group consisting of ##STR2## wherein R.sub.4, R.sub.5 and R.sub.6 are individually selected from the group consisting of hydrogen, lower alkyl and lower alkenyl, n is 2 or 3 and -- in the case when formula IIB is a phenyl - this group may carry one to four substituents selected from the group consisting of halogen, lower alkyl, lower alkenyl and phenyl, and R.sub.3 is lower alkyl optionally substituted with 1 or 2 phenyls which phenyl groups may be substituted with nitro and the dotted lines of formula IIB indicate the optional presence of double bonds and a process for their preparation and process for the preparation of cephalosporanic acid derivatives using the azetidines of formula I as intermediates.
REFERENCES:
patent: 3843682 (1974-10-01), Kukolja et al.
patent: 3880880 (1975-05-01), Ellis et al.
Tan Hong Sheng
Verweij Jan
Gist-Brocades N.V.
Torrence Dolph H.
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