Vanadium-Catalyzed Oxidation of tert-Butyl N-Hydroxycarbamate to tert-Butyl Nitrosoformate and Its Diels–Alder Reaction with Simple and Functionalized Dienes.

A general and efficient vanadium-catalyzed oxidation of tert-butyl N-hydroxycarbamate to tert-butyl nitrosoformate using alkyl hydroperoxides as terminal oxidants has been developed. The intermediate nitroso compound was trapped by in situ Diels–Alder reaction with simple and functionalized dienes, providing general access to a variety of functionalized 3,6-dihydro-2H-1,2-oxazines. [ABSTRACT FROM AUTHOR]