Synthesis 2019; 51(07): 1633-1642
DOI: 10.1055/s-0037-1611367
paper
© Georg Thieme Verlag Stuttgart · New York

Oxidative Dearomatization and Sigmatropic 1,3-Acyl Shift in Excited State: Aromatics to Embellished cis-Hydrindanes

Raghaba Sahu
a   Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India   Email: vks@chem.iitb.ac.in
,
Vishwakarma Singh*
a   Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India   Email: vks@chem.iitb.ac.in
b   Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal 462066, India
› Author Affiliations
VS is grateful to the Department of Science and Technology, New Delhi for J C Bose National Fellowship (SR/S2/JCB-34/2009), IRCC IIT Bombay for review paper award (11 IRAWD 004) and IIT Bombay for a chair Professorship. RS thanks University Grants Commission New Delhi for a research fellowship [19-06/2011(i) EU-IV]. We also thank D. Mhatre for the X-ray crystal structure determination.
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Publication History

Received: 22 September 2018

Accepted after revision: 06 November 2018

Publication Date:
09 January 2019 (online)


Abstract

A stereoselective synthetic route to embellished cis-hydrindanes from simple aromatic precursors is described. Oxidative dearomatization, ring expansion, and photochemical 1,3-acyl shift are the key features of our approach. Oxidative dearomatization of o-(hydroxymethyl)phenols followed by π4s + π2s cycloaddition furnishes bicyclo[2.2.2]octanes with contiguous keto epoxide groups, which upon ring expansion lead to bicyclo[3.2.2]nonanes endowed with a β,γ-enone chromophore. Unbridging of bicyclo[3.2.2]nonanes upon singlet excitation furnishes embellished cis-hydrindanes.

Supporting Information