Abstract
A highly stereoselective synthesis of cis-3,6-disubstituted dihydro-1,2-oxazines has been accomplished through the one-pot oxidative nitroso-Diels-Alder reaction of N-arylhydroxylamines with diene carbamates. The new system is based on a combination of chiral phosphoric acid and m-CPBA and gives various 3,6-disubstituted dihydro-1,2-oxazines in excellent regio-, diastereo-, and enantioselectivity.
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