Abstract
Syntheses of 5-phosphono-2-oxazolidinones and 5-phosphono-2-imidazolidinones were achieved from the corresponding 1-vinyl-2-phosphonoaziridines. Regioselective aziridine ring opening employing methyl chloroformate affords 1-amido-2-chloroethylphosphonates, which were easily transformed into the corresponding 2-oxazolidinones upon heating in dimethyl sulfoxide. Treatment of the aziridine ring opening products with ammonia furnishes vinylphosphonates, which undergo a Michael type addition with several amines. In situ ring closure of the addition products yields the corresponding phosphonylated 2-imidazolidinones.
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