Lewis Acid Mediated Reactions of 1-Cyclopropyl-2-arylethanones with Allenic Esters: A Facile Synthetic Protocol for the Preparation of Dihydrofuro[2,3-<i>h</i>]chromen-2-one Derivatives
作者:Min Shi、Xiang-Ying Tang、Yong-Hua Yang
DOI:10.1021/ol701713y
日期:2007.9.1
TMSOTf-mediated reactions of 1-cyclopropyl-2-arylethanones with allenicesters afford a novel method for the synthesis of dihydrofuro[2,3-h]chromen-2-onederivatives in moderate to good yields. This process is a sequential reaction involving a nucleophilic ring-opening reaction of the cyclopropane by H(2)O, two intermolecular aldol-type reactions and one intramolecular aldol-type reaction, a cyclic transesterification