Process for 3-exomethylenecepham sulfoxide esters

Details Process for 3-exomethylenecepham sulfoxide esters Process for 3-exomethylenecepham sulfoxide esters

1991-01-04

1992-06-30

Rizzo, Nicholas S.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540215, 540222, C07D50102

Patent

active

051264463

ABSTRACT:
3-Exomethylenecepham sulfoxide esters are obtained in improved yields via cyclization of 3-methyl-2-(4-chlorosulfinyl-2-oxo-3-amino-1-azetidinyl)-3-butenoic acid esters under anhydrous conditions with a Lewis acid-type Friedel-Crafts catalyst in the presence of a nitro compound, e.g., nitromethane, nitroethane, nitropropane or nitrobenzene.

REFERENCES:
patent: 4052387 (1977-10-01), Kukolja
patent: 4075203 (1978-02-01), Chou
patent: 4081440 (1978-03-01), Kukolja
patent: 4165315 (1979-08-01), Kukolja
patent: 4190724 (1980-02-01), Chou
patent: 4289695 (1981-09-01), Chou
patent: 4950753 (1990-08-01), Copp et al.

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