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C07D501/00—Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula:, e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
C07D501/02—Preparation
C07D501/08—Preparation by forming the ring or condensed ring systems
C07D501/10—Preparation by forming the ring or condensed ring systems from compounds containing the penicillin ring system