Synlett 2012; 23(20): 2894-2898
DOI: 10.1055/s-0032-1317543
letter
© Georg Thieme Verlag Stuttgart · New York

An Efficient, One-Pot Regioselective Synthesis of Highly Functionalized Chromen-5-ones and Pyrano[3,2-c]chromen-5-ones via a Tandem Knoevenagel–Michael–Cyclization Sequence

Jayabal Kamalraja
Organic Chemistry Division, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, Tamilnadu, India   Fax: +91(44)24911589   Email: ptperumal@gmail.com
,
Doraiswamy Muralidharan
Organic Chemistry Division, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, Tamilnadu, India   Fax: +91(44)24911589   Email: ptperumal@gmail.com
,
Paramasivan Thirumalai Perumal*
Organic Chemistry Division, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, Tamilnadu, India   Fax: +91(44)24911589   Email: ptperumal@gmail.com
› Author Affiliations
Further Information

Publication History

Received: 21 September 2012

Accepted after revision: 17 October 2012

Publication Date:
16 November 2012 (online)


Preview

Abstract

A facile, convenient, efficient, and high-yielding regio­selective synthesis of a combinatorial library of hitherto unreported highly functionalized chromen-5-ones and pyrano[3,2-c]chromen-5-ones has been developed by one-pot three-component coupling of substituted aromatic aldehydes, dimedone/4-hydroxycoumarin with NMSM in the presence of catalytic amount of piperidine in ethanol medium. This transformation presumably proceeds via domino Knoevenagel condensation–Michael addition–intermolecular cyclization sequence creating three new bonds (two C–C and one C–O) and one stereocenter in a single operation.

Supporting Information