作者:Yongda Zhang、Tomislav Rovis
DOI:10.1016/j.tet.2003.03.004
日期:2003.11
A series of 1,3-dioxanyl vinyl acetals were readily synthesized from the corresponding dioxanone by a reduction and in situ acylation followed by Petasis olefination. Treatment of these vinyl acetals with BF3 . OEt2 results in an O to 5 rearrangement to form anti-3,5-dihydroxyketones while a mixture of Me3Al and BF3.OEt2 provides the corresponding syn relationship via a stereoretentive rearrangement. (C) 2003 Elsevier Ltd. All rights reserved.