[EN] PROCESS FOR PREPARING CEPHALOSPORIN INTERMEDIATES USING alpha-IODO-1-AZETIDINEACETIC ACID ESTERS AND TRIALKYLPHOSPHITES [FR] PROCEDE DE PREPARATION D'INTERMEDIAIRES DES CEPHALOSPORINES AU MOYEN D'ESTERS D'ACIDE DOLLAR G(A)-IODO-1-AZETIDINE ACETIQUE ET DE TRIALKYLPHOSPHITES
Development of an Alternative Process for the Manufacture of a Key Starting Material for Cefovecin Sodium
摘要:
A process has been developed for the use of trimethylphosphite for the formation of the six-membered 3,6-dihydro-2H-[1,3]thiazine ring in the cephem architecture by an intramolecular Horner-Emmons-Wadsworth condensation. The process is a suitable alternative to the traditional Wittig process, which uses trimethylphosphine. The process developed is a highly telescoped reaction pathway consisting of at least six known reaction intermediates that was scaled for production use to produce 2.