Synlett 2014; 25(18): 2649-2653
DOI: 10.1055/s-0034-1379203
letter
© Georg Thieme Verlag Stuttgart · New York

Unprecedented C-Methylation at the 2-Position of 2-Carboxy-4-Chromanones – A Case Study with the Corey–Chaykovsky Reagent

Subrata Ghosh
a   Nano Characterization Unit, Advanced Key Technologies Division, National Institute of Material Science, Ibaraki 3050047, Japan
,
Nellore Bhanu Chandar
b   Computation and Simulation Unit (Analytical Discipline & Centralized Instrument Facility), Central Salt and Marine Chemicals Research Institute, G.B. Marg, Bhavnagar, Gujarat, 3624002 , India   Fax: +91(278)2567562   Email: ganguly@csmcri.org
e   Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, 364002, India
,
Debayan Sarkar
c   Department of Chemistry, National Institute of Technology, Rourkela, Odissa, 769008, India
,
Manoj Kumar Ghosh
c   Department of Chemistry, National Institute of Technology, Rourkela, Odissa, 769008, India
,
Bishwajit Ganguly*
b   Computation and Simulation Unit (Analytical Discipline & Centralized Instrument Facility), Central Salt and Marine Chemicals Research Institute, G.B. Marg, Bhavnagar, Gujarat, 3624002 , India   Fax: +91(278)2567562   Email: ganguly@csmcri.org
e   Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, 364002, India
,
Indrajit Chakraborty*
d   Department of Chemistry, KIIT University, Bhubaneswar, Odissa, 751024, India   Fax: +91(674)2725113   Email: indraji2001@gmail.com
› Author Affiliations
Further Information

Publication History

Received: 25 August 2014

Accepted after revision: 01 September 2014

Publication Date:
07 October 2014 (online)


Abstract

An unprecedented C-methylation at the 2-position of 4-chromanone-2-carboxylates was achieved in good yield on treatment with dimethylsulfoxonium methylide. The reaction was performed with excellent chemo- as well as regioselectivity. It is the first synthetic report of alkylation at the 2-position of the chromanone framework through a very mild and simple approach. Such an uncommon behavioral pattern of the Corey–Chaykovsky reagent is justified by theoretical potential energy surface calculations.

Supporting Information