Unprecedented Intramolecular Nucleophilic Aromatic Additions of Allyloxy Anions to Diphenylphosphinoyl-Substituted Benzene Rings: A Facile Method for Preparing Multisubstituted Benzopyrans
作者:Brian Keay、Evugeni Gorobets、Masood Parvez
DOI:10.1055/s-2007-1000835
日期:2008.1
A new synthetic method for the preparation of multisubstituted benzopyrans that involves an intramolecular conjugate addition of allyloxy anions to diphenylphosphinoyl-substituted benzene rings is described. The intermediate anion is trapped with electrophiles providing benzopyrans that are readily oxidized with O 2 to intermediates containing a peroxide that is easily converted into benzopyran-2-ones
描述了一种制备多取代苯并吡喃的新合成方法,该方法涉及将烯丙氧基阴离子与二苯基膦酰基取代的苯环进行分子内共轭加成。中间体阴离子被亲电试剂捕获,提供容易被 O 2 氧化成含有过氧化物的中间体,该中间体容易转化为苯并吡喃-2-酮(即香豆素)。