Enantioselective Synthesis of Diazobicyclic Oxadiazines via Organocatalytic [3+3]-Cycloaddition of γ-Hydroxy-α,β-Unsaturated Carbonyls with N,N′-Cyclic Azomethine Imines

Abstract

A diastereo- and enantioselective synthesis of diazobicyclic oxadiazines was developed through an organocatalytic cycloaddition reaction. Asymmetric catalytic [3+3]-cycloaddition of γ-hydroxy-α,β-unsaturated carbonyls with N,N′-cyclic azomethine imines, using a squaramide-based catalyst, provided biologically important enantioenriched diazobicyclic oxadiazines in good yields with moderate to high diastereo- and enantioselectivities (up to 10:1 dr and 79:21 er).

Key words

asymmetric catalysis - [3+3]-cycloaddition - N,N′-cyclic azomethine - diazobicycle - oxadiazine

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