Preparation of substituted 5,6-dihydro-4H-1,3-oxazines from olefins

The 5,6-dihydro-4H-1,3-oxazine derivatives of methyl oleate and related compounds have been prepared. These novel six-membered heterocyclic compounds were obtained by the condensation of N-hydroxymethyl or N-chloromethylbenzamide with methyl oleate or its derivatives. These reactions can be regarded as 1,4-dipolar addition reactions.