Enantioselective Construction of Quaternary Stereogenic Centers by the Addition of an Acyl Anion Equivalent to 1,3-Dienes
作者:Nathan J. Adamson、Sangjune Park、Pengfei Zhou、Andrew L. Nguyen、Steven J. Malcolmson
DOI:10.1021/acs.orglett.0c00412
日期:2020.3.6
We report the enantioselective formation of quaternary stereogenic centers by the intermolecular addition of malononitrile, an acyl anion equivalent, and related pronucleophiles to several 1,3-disubstituted acyclic 1,3-dienes in the presence of a Pd-PHOX catalyst. Products are obtained in up to 88% yield and 99:1 er and in most cases are formed as a single regioisomer. The products' malononitrile unit
我们报道了在Pd-PHOX催化剂的存在下,通过分子间添加丙二腈,酰基阴离子当量和相关亲核试剂到几个1,3-二取代的无环1,3-二烯的分子间加成形成季立体中心的对映选择性。以高达88%的产率和99:1的产率获得产物,并且在大多数情况下形成单一的区域异构体。产品的丙二腈单元经过氧化功能化,生成带有内部烯烃和α-季立体中心的β,γ-不饱和羰基。