Synlett 2019; 30(01): 12-20
DOI: 10.1055/s-0037-1610313
synpacts
© Georg Thieme Verlag Stuttgart · New York

Manganese-Catalyzed Direct Olefination via an Acceptorless Dehydrogenative Coupling of Methyl Heteroarenes with Primary Alcohols

Milan K. Barman
,
Satyadeep Waiba
,
Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia-741246, WB, India   Email: bm@iiserkol.ac.in
› Author Affiliations
This work supported by IISER Kolkata (Start-up grant) and SERB (ECR/2016/001654).
Further Information

Publication History

Received: 13 September 2018

Accepted after revision: 12 October 2018

Publication Date:
14 November 2018 (online)


Abstract

Synthesis of olefins utilizing different catalytic strategies is an emerging topic in organic chemistry. However, despite of tremendous progress in the field the direct olefination of C(sp3)–H bonds using primary alcohols via an acceptorless dehydrogenative coupling (ADC) is not developed. Such an ADC reaction is highly environmentally benign as it produces dihydrogen and water as the sole byproducts. The liberated dihydrogen can potentially be used as an energy source. In this Synpact article, we present the recent development of ADC reaction as a tool to make unsaturated molecules and a summary of our recently developed synthetic procedure for the preparation of olefins employing an ADC reaction of methyl heteroarenes with alcohols. The catalyst development using an earth’s abundant metal manganese and the scope of such reaction is discussed.

1 Introduction

2 The Acceptorless Dehydrogenative Coupling as a Tool to Make Unsaturated Molecules

3 Transition-Metal-Catalyzed Coupling of Alcohols with Methyl-Substituted Heteroarenes

4 Development of the Manganese Catalyst for the Olefination of Methyl-Substituted Heteroarenes

5 Scope and Limitation of the Manganese-Catalyzed Direct Olefination of Methyl-Substituted Heteroarenes

6 Mechanistic Studies and Proposed Mechanism

7 Conclusion