title: A new synthetic access to furo[3,2-f]chromene analogues of an antimycobacterial.
abstract: From the structure of 3,3-dimethyl-3H-benzofuro[3,2-f][1]-benzopyran, a selective in vitro inhibitor of mycobacterial growth, we have undertaken a structure-activity relationship investigation. We wish to report here our results on the use of [2+3] cycloadditions between 2-formylbenzoquinone and various enol derivatives to give various 4-formyl-5-hydroxy benzofurans. In the next step, an ytterbium triflate-catalysed reaction with 2-methylpropene allowed the preparation of various original furo[3,2-f]chromenes derivatives. Their biological evaluation on the growth of Mycobacterium smegmatis as well as Mycobacterium tuberculosis pointed out that some analogues were four times more active than the initial hit.
authors.affiliation: Laboratoire de Chimie Organique, URA 2128 CNRS-Institut Pasteur, 25-28 rue du Docteur Roux, 75724 Paris Cedex 15, France.
authors.forename: Luke
authors.initials: L
authors.lastname: Alvey
authors.forename: Soizic
authors.initials: S
authors.lastname: Prado
authors.forename: Valérie
authors.initials: V
authors.lastname: Huteau
authors.forename: Brigitte
authors.initials: B
authors.lastname: Saint-Joanis
authors.forename: Sylvie
authors.initials: S
authors.lastname: Michel
authors.forename: Michel
authors.initials: M
authors.lastname: Koch
authors.forename: Stewart T
authors.initials: ST
authors.lastname: Cole
authors.forename: François
authors.initials: F
authors.lastname: Tillequin
authors.forename: Yves L
authors.initials: YL
authors.lastname: Janin