Continuous flow photocyclization of stilbenes – scalable synthesis of functionalized phenanthrenes and helicenes
作者:Quentin Lefebvre、Marc Jentsch、Magnus Rueping
DOI:10.3762/bjoc.9.221
日期:——
A continuous flow oxidative photocyclization of stilbenederivatives has been developed which allows the scalable synthesis of backbone functionalized phenanthrenes and helicenes of various sizes in good yields.
An efficient and enantioselectivesynthesis of oxa[9]helicenes has been established via vanadium(V)-catalyzed oxidative coupling/intramolecular cyclization of polycyclic phenols. A newly developed vanadium complex cooperatively functions as both a redox and Lewis acidcatalyst to promote the present sequential reaction and afford oxa[9]helicenes in good yields with up to 94% ee.
已经通过钒(V)催化的多环酚的氧化偶联/分子内环化建立了有效和对映选择性合成氧杂[9]螺旋烯。新开发的钒配合物协同作用作为氧化还原和路易斯酸催化剂,以促进当前的顺序反应并以高达 94% ee 的良好收率提供氧杂 [9] 螺旋烯。