Synlett 2024; 35(20): 2397-2402
DOI: 10.1055/a-2356-8408
letter
Special Issue to Celebrate the 75th Birthday of Prof. B. C. Ranu

Synthesis and Reactions of Pentacycloundecane Derivatives Related to Cookson’s Dione

Sambasivarao Kotha
a   Department of Chemistry, Indian Institute of Technology-Bombay, Powai, 400076, India
b   Department of Chemistry, Sunandan Divatia School of Science, SVKM’s NMIMS (Deemed-to-be) University, Vile Parle (West), Mumbai, 400056, India
,
Mohammad Salman
a   Department of Chemistry, Indian Institute of Technology-Bombay, Powai, 400076, India
› Author Affiliations
M.S. thanks the University Grants Commission (UGC), New Delhi, for the award of a research fellowship.


Abstract

In this study, a pentacyclic keto-olefin was treated with thallium(III) nitrate trihydrate, resulting in the formation of mono ring-expanded product. However, when the corresponding dialkene was treated with thallium(III) nitrate trihydrate, an unexpected ring-closure product was obtained instead of the expected double ring-expanded product. The use of the Tebbe reagent facilitated the olefination of hindered and enolizable cage dione derivatives, converting both keto moieties into methylene groups and forming the desired diolefin. Notably, conventional Wittig reagents proved to be ineffective in the olefination sequence with cage diones.

Supporting Information



Publication History

Received: 25 May 2024

Accepted after revision: 12 June 2024

Accepted Manuscript online:
28 June 2024

Article published online:
17 July 2024

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