Process for 1-oxa-.beta.-lactams

Details Process for 1-oxa-.beta.-lactams Process for 1-oxa-.beta.-lactams

1982-11-16

1984-07-03

Raymond, Richard

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D49804

Patent

active

044580711

ABSTRACT:
An azetidin-2-one-4-sulfinic acid represented by the formula ##STR1## is reacted with Pb(OAc).sub.4 in liquid SO.sub.2 containing CuII ion to provide isomeric cyclization products of the formulas ##STR2## wherein R is e.g. benzyl, phenoxymethyl, benzyloxy, diphenylmethoxy, and R.sub.1 is a carboxy-protecting group. The products of the process are useful intermediates for 1-oxa-.beta.-lactam antibacterials.

REFERENCES:
patent: 4150156 (1979-04-01), Beattie et al.
patent: 4366316 (1982-12-01), Yoshioka et al.

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