4-OXOAZETIDINE-2-SULFONIC ACIDS OR THEIR SALTS AS INTERMEDIATE PRODUCTS FOR SYNTHESIS OF BETA-LACTAM ANTIBIOTICS AND A METHOD OF THEIR SYNTHESIS Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: product: 4-oxoazetidine-2-sulfonic acids of the general formula (I) R¹ where R² atom of hydrogen, halogen or phenylacetamido-group; R³ atom of hydrogen, halogen, phenylacetamido-, phenoxyacetamido-, phthalimido- or 5-methyl-3-o-chlorophenylisoxazole-4-carboxamido-group; R⁴ atom of hydrogen, alkaline or alkaline-earth metal, quaternary ammonium group; SO₂O^-N⁺Bu₄-n hydrogen, (CH₃)₂C=C-COOCH₃, (CH₃)₂C=COOCH₂-C₆H₄-CH₃-m, (CH₃)₂C=C-COO-CH₂-Ph, (CH₃)₂C=C-COOCH₂-C₆H₄-NO₂-n, , or their salts, and a method of their synthesis. EFFECT: improved method of synthesis. 26 cl