Synthesis 2017; 49(24): 5339-5350
DOI: 10.1055/s-0036-1591726
paper
© Georg Thieme Verlag Stuttgart · New York

Ring-Closing Metathesis Approach to Cage Propellanes Containing Oxepane and Tetrahydrofuran Hybrid System

Sambasivarao Kotha*
Department of Chemistry, Indian Institute of Technology-Bombay, 400076 Powai, India   Email: srk@chem.iitb.ac.in
,
Subba Rao Cheekatla
Department of Chemistry, Indian Institute of Technology-Bombay, 400076 Powai, India   Email: srk@chem.iitb.ac.in
,
Darshan S. Mhatre
Department of Chemistry, Indian Institute of Technology-Bombay, 400076 Powai, India   Email: srk@chem.iitb.ac.in
› Author Affiliations
We thank Defence Research and Development Organisation (DRDO, NO. ARDB/01/1041849/M/1), New Delhi-India for financial assistance. S.K. thanks Department of Science and Technology (DST, NO. SR/S2/JCB-33/2010) DST, New Delhi, India for the award of a J. C. Bose fellowship and Praj industries for Chair Professorship (Green Chemistry). S.R.C. thanks University Grants Commission (UGC), New Delhi, India for the award of a research fellowship.
Further Information

Publication History

Received: 16 September 2017

Accepted after revision: 21 October 2017

Publication Date:
23 November 2017 (online)


Abstract

The preparation of a variety of structurally interesting oxygenated cage compounds involving atom-economic processes such as Claisen rearrangement, Diels–Alder reaction, [2+2] photocycloaddition, and ring-closing metathesis (RCM) as key steps is reported. For the first time, oxepane ring system is introduced in cage framework using olefin metathesis as a key step. These cage systems assembled here are difficult to prepare by traditional methods. The synthetic sequence described here opens up new routes to higher order polycycles containing heteroatoms without the involvement of protecting groups. Transannular cyclization observed during Grignard addition and the RCM protocol used here may be applicable to generate unknown oxygenated cage systems.

Supporting Information