Synlett 2018; 29(03): 282-295
DOI: 10.1055/s-0036-1590960
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© Georg Thieme Verlag Stuttgart · New York

[3]Dendralenes: Synthesis, Reactivity Studies and Employment in Diversity-Oriented Synthesis of Complex Polycyclic Scaffolds

Gonna Somu Naidu
a   Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
b   Homi Bhabha National Institute, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India   Email: ghsunil@barc.gov.in
,
Rekha Singh
a   Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
,
a   Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
b   Homi Bhabha National Institute, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India   Email: ghsunil@barc.gov.in
› Author Affiliations
Further Information

Publication History

Received: 24 August 2017

Accepted after revision: 17 October 2017

Publication Date:
11 December 2017 (online)


Abstract

[3]Dendralenes are exquisite molecules as they exhibit enormous potential for the rapid generation of architecturally esoteric scaffolds when subjected to tandem Diels–Alder reactions, but their synthesis is a tall order. In conjunction with diversity-oriented synthesis, [3]dendralenes satisfy the potential demand for simultaneous and efficient synthesis of intricate collections of molecules that exhibit a range of activities for lead generation in drug discovery. This account chronicles our roller-coaster journey and systematic approach beginning from the synthesis of extremely unstable, non-isolable [3]dendralenes through moderately stable examples and then finally, highly functionalized, stable [3]dendralenes via sequential methylenation (using dimethylsulfonium methylide) and Horner–Wadsworth–Emmons olefination. It also describes the study of the attributes affecting their stability and reactivity with various dienophiles. In addition, it reports on how these dendralenes, upon astute maneuvering, can be engaged in a diene-transmissive Diels–Alder (DTDA) sequence, thus harnessing their full potential by construction of a small but diverse library of complex frameworks in a quick and efficient manner, with step and atom economy.

1 Introduction

2 Literature Methods for [3]Dendralene Synthesis

3 Our Tryst with [3]Dendralenes

3.1 Serendipitous Olefination with the Corey–Chaykovsky Ylide

3.2 Synthesis of [3]Dendralenes and Reactivity/Stability Studies

3.3 Diels–Alder Reactions of [3]Dendralenes

3.4 Tuning of [3]Dendralenes for the DTDA Reactions

3.5 Diversity-Oriented Synthesis with [3]Dendralenes

3.6 Rationalization of Factors Governing the Stability and Reactivity of [3]Dendralenes

4 Conclusions