Preparation of 1-oxapenicillins and intermediates therefor

Details Preparation of 1-oxapenicillins and intermediates therefor Preparation of 1-oxapenicillins and intermediates therefor

1975-06-17

1978-01-31

Rizzo, Nicholas S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

544 97, 544111, 260268C, 26029369, 260307FA, 260308D, 26032637, 2603322H, 2603472, C07D20508, C07D49804

Patent

active

040715124

ABSTRACT:
The invention provides a novel process for opening the ring of 2-R-6-(1'-R.sup.1 -oxycarbonyl-2'-methyl-prop-1'-enyl)-1-oxa-3,6-diaza-4S,5R-bicyclo[3,2,0]h ept-2-en-7-one by treatment with a sulfonic acid salt thereby forming R.sup.1 2-(2'R-R-oxy-3'S-amino-4'-oxo)azetidinyl-3-methyl-2-butenoate sulphonic acid salts which can provide oxapenicillins by two different routes depending on the substituent desired on the carboxamido group of the 1-oxapenicillins. In the alternate processes, new intermediates are also provided.

REFERENCES:
patent: 3860577 (1975-01-01), Kukolja

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