Synthesis of medium-sized aryl-fused nitrogenous heterocycles via sequential aryne aza-Claisen rearrangement/ring-closing metathesis?

Organic & Biomolecular Chemistry Pub Date: 2018-02-16 DOI: 10.1039/C7OB03166A

Abstract

The reaction of arynes and secondary allylamines furnished ortho-allyl-substituted N-arylanilines via an aza-Claisen rearrangement. In this transformation, the sequential formation of C–C and C–N bonds occurred by involving two aryne molecules under metal-free reaction conditions to provide moderate to good yields of the products. The obtained ortho-allyl-substituted N-arylaniline derivatives were further converted into aryl-fused medium-sized (7–9) nitrogenous heterocyclic molecules such as azepines, azocines and azonines via ring-closing metathesis (RCM).

Graphical abstract: Synthesis of medium-sized aryl-fused nitrogenous heterocycles via sequential aryne aza-Claisen rearrangement/ring-closing metathesis
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