Process for 3-exomethylenecepham sulfoxide esters

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

1989-05-17

1990-08-21

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

049507532

ABSTRACT:
3-Exomethylenecepham sulfoxide esters are obtained in improved yields via cyclization of 3-methyl-2-(4-chlorosulfinyl-2-oxo-3-acylamino-1-azetidinyl)-3-butenoic acid esters under anhydrous conditions with stannic chloride in the presence of both an oxo compound, e.g., an ether such as diethyl ether, a ketone such as acetone or methylethyl ketone, and an unsaturated compound, e.g., an alkene such as 1- or 2-hexene, a non-conjugated alkadiene such as 1,4-hexadiene, a cycloalkene such as cyclohexene, an allene, or a non-conjugated cycloalkadiene such as 1,4-cyclohexadiene.

REFERENCES:
patent: 4052387 (1977-10-01), Kukoya et al.
patent: 4190724 (1980-02-01), Chou

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