Synthesis of diverse β-quaternary ketones via palladium-catalyzed asymmetric conjugate addition of arylboronic acids to cyclic enones
作者:Jeffrey C. Holder、Emmett D. Goodman、Kotaro Kikushima、Michele Gatti、Alexander N. Marziale、Brian M. Stoltz
DOI:10.1016/j.tet.2014.11.048
日期:2015.9
The development and optimization of a palladium-catalyzed asymmetric conjugate addition of arylboronic acids to cyclic enone conjugate acceptors is described. These reactions employ air-stable and readily-available reagents in an operationally simple and robust transformation that yields β-quaternary ketones in high yields and enantioselectivities. Notably, the reaction itself is highly tolerant of
描述了钯催化芳基硼酸与环烯酮共轭受体的不对称共轭加成的开发和优化。这些反应采用空气稳定且易于获得的试剂,通过操作简单且稳健的转化,以高产率和对映选择性产生 β-季酮。值得注意的是,反应本身对大气中的氧气和湿气具有高度耐受性,因此不需要使用干燥或脱氧溶剂、特别纯化的试剂或惰性气氛。烯酮的环大小和β-取代基变化很大,可以合成多种β-季酮。最近,NH 4 PF 6的使用进一步扩大了底物范围,包括含杂原子的芳基硼酸和β-酰基烯酮底物。