Natho P, Kapun M, Allen LAT, Parsons PJ. Regioselective Transition-Metal-Free Oxidative Cyclobutanol Ring Expansion to 4-Tetralones.
Org Lett 2018;
20:8030-8034. [PMID:
30520646 DOI:
10.1021/acs.orglett.8b03619]
[Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A facile and transition-metal-free ring expansion of the cyclobutanol moiety to 4-tetralones fused to heteroaromatic systems is described. The oxidative ring expansion proceeds rapidly and regioselectively through mediation by N-bromosuccinimide and acetonitrile in satisfactory to good yields. The preparation of precursors and the ring expansion have proven to be scalable and are straightforward to carry out.
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