(3S, 4R)-3,4-trans-disubstituted azetidin-2-one intermediates

Details (3S, 4R)-3,4-trans-disubstituted azetidin-2-one intermediates (3S, 4R)-3,4-trans-disubstituted azetidin-2-one intermediates

1989-03-24

1990-10-09

Berch, Mark L.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

540310, C07D20509, C07D40312, C07D41712, C07B 5100

Patent

active

049621963

ABSTRACT:
The invention relates to an improved process for the preparation of compounds of formula ##STR1## or salts thereof, starting from compounds of formulae ##STR2## via compounds of formulae ##STR3## in which compounds R.sub.1 is hydrogen or lower alkyl, R.sub.2 is an organic radical which may carry a functional group which may be protected by a customary protective group R.sub.2.sup.o, R.sub.3 is hydrogen or a customary carboxyl protective group R.sub.3.sup.o, W is a group which can be replaced by a thiocarboxylic acid radical of formula III, and Z is oxygen or sulfur.

REFERENCES:
patent: 4347183 (1982-08-01), Afonso et al.
patent: 4540579 (1985-09-01), Afonso
patent: 4656165 (1987-04-01), Lang
patent: 4826832 (1989-05-01), Lang
J. Rigaudy et al., Nomenclature of Organic Chemistry (1979 Edition), p. 66.
Paterson, Austin M. American Chemical Society.
J. Am. Chem. Soc. vol. 104, No. 22 pp. 6138 (1982).

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