We have developed an efficient and mild enantioselective palladium-catalyzed (5+3) cycloaddition of vinylcyclopropanes and oxidopyrylium ylides generated in situ from benzopyranones, in the presence of a chiral PHOX ligand. These reactions afford various highly functionalized bridged oxa-[3.3.1]carbocycles with three stereogenic centers that are challenging to synthesize, in moderate to good yields
                                    在手性 PHOX 
配体的存在下,我们开发了一种高效且温和的对映选择性
钯催化 (5+3) 环加成
乙烯基环丙烷和由苯并
吡喃酮原位生成的氧化
吡喃叶立德。这些反应提供了各种高度官能化的桥接氧杂环-[3.3.1] 碳环,具有三个难以合成的立体中心,具有中等至良好的产率和对映选择性。