Asymmetric Synthesis of α-Quaternary γ-Lactams through Palladium-Catalyzed Asymmetric Allylic Alkylation
作者:Tao Song、Stellios Arseniyadis、Janine Cossy
DOI:10.1021/acs.orglett.8b03613
日期:2019.2.1
The synthesis of chiral unsaturated γ-lactams is reported featuring a highly enantioselective palladium-catalyzed asymmetric allylic alkylation of α,γ-disubstituted 2-silyloxypyrroles. This method allows a straightforward access to optically active γ-lactams bearing an α-quaternary stereogenic center in high yields (up to 93%), high regioselectivities (up to >20:1), and excellent enantioselectivities
据报道,手性不饱和γ-内酰胺的合成具有高度对映选择性的钯催化的α,γ-二取代的2-甲硅烷氧基吡咯的不对称烯丙基烷基化反应。这种方法可以直接获得具有α-季生立体中心的旋光性γ-内酰胺,产率高(高达93%),区域选择性高(高达> 20:1)和出色的对映选择性(高达95%ee)。 。为了进一步证明该方法的合成效用,将所得的烯丙基化产物转化为各种通用的手性构件,例如吡咯烷和吡咯烷酮。