Process for preparing thiazolino azetidinone and 2-exo-methylene

Details Process for preparing thiazolino azetidinone and 2-exo-methylene Process for preparing thiazolino azetidinone and 2-exo-methylene

1993-01-11

1994-02-22

Rizzo, Nicholas S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540352, 540353, C07D49904, C07D51304

Patent

active

052888606

ABSTRACT:
The present invention provides a thiazolinoazetidinone derivative represented by the formula ##STR1## wherein R.sup.1 is phenyl having or not having substituent(s), methyl having or not having substituent(s) or ##STR2## group, R.sup.3 being phenyl having or not having substituent(s), and R.sup.2 is a hydrogen atom or carboxylic acid protective group, and a process for preparing the same.
The present invention further provides a process for preparing a 2-exo-methylenepenam derivative characterized by hydrolyzing the thiazoline ring of a thiazolinoazetidinone derivative of the above formula (1) to effect recyclization and obtain a 2-exo-methylenepenam derivative represented by the formula ##STR3## wherein R.sup.1 and R.sup.2 are as defined above.

REFERENCES:
patent: 4482491 (1984-11-01), Torii et al.
patent: 5196530 (1993-03-01), Torii et al.

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