[3 + 3]-Cycloaddition of α-Diazocarbonyl Compounds and N-Tosylaziridines: Synthesis of Polysubstituted 2 H-1,4-Oxazines through Synergetic Catalysis of AgOTf/Cu(OAc)2.

An impressive and new [3 + 3]-cycloaddition of α-diazocarbonyl compounds with N-tosylaziridines via synergetic catalysis of AgOTf and Cu(OAc)2 has been well described, which offers efficient access to highly substituted 2 H-1,4-oxazine derivatives. A variety of α-diazocarbonyl compounds and N-tosylaziridines were compatible substrates with convenient operations under mild reaction conditions.