Access to racemic and enantioenriched 3-methyl-4-chromanones: catalysed asymmetric protonation of corresponding enolic species as the key step
作者:Olivier Roy、François Loiseau、Abdelkhalek Riahi、Françoise Hénin、Jacques Muzart
DOI:10.1016/j.tet.2003.09.095
日期:2003.11
Bronsted acids induced the intramolecular cyclisation of 3-aryloxypropanoic esters affording 3-methyl-4-chromanones, which have been transformed into the corresponding racemic benzyl beta-oxoesters. These latter esters, in the presence of hydrogen and catalytic amounts of both palladium and (endo, endo) aminobomeol, led to optically active chromanones with up to 75% ee through a deprotection-decarboxylation-protonation cascade reaction. (C) 2003 Elsevier Ltd. All rights reserved.