Process for preparing 3-exo-methylenecepham derivatives

Details Process for preparing 3-exo-methylenecepham derivatives Process for preparing 3-exo-methylenecepham derivatives

1982-08-09

1985-02-12

Rizzo, Nicholas S.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544 22, C07D50202

Patent

active

044992653

ABSTRACT:
This invention provides a process for preparing a 3-exo-methylenecepham derivative represented by the formula ##STR1## wherein R.sup.1 represents an aralkyl or aryloxymethyl group both of which may be substituted on the aromatic ring, and R.sup.2 represents a carboxyl-protecting group, the process comprising subjecting a compound represented by the formula ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, to a cyclization reaction in an acidic water-containing solvent.

REFERENCES:
patent: 4018776 (1977-04-01), Foglio et al.
patent: 4060688 (1977-11-01), Chauvette
patent: 4190724 (1980-02-01), Chou
patent: 4346218 (1982-08-01), Tsuji et al.

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