Cyclizations unsaturated ketones, sodium hydride

Aziridination of unsaturated ketones can be achieved directly using sodium hydride in conjunction with iV,)V -diammo-l,4-diazoniabicyclo[2.2.2]octane dinitrate (eq 41). This reaction proceeds through a nitrogen-nitrogen ylide. The yUde undergoes Michael addition followed by cyclization of the resulting enolate and expulsion of the tertiary amine. 

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