A highlyenantioselective Pd-catalyzed partial hydrogenation of simple 2,5-disubstituted pyrroles with a Brønsted acid as an activator has been successfully developed, providing chiral 2,5-disubstituted 1-pyrrolines with up to 92% ee.
reductive cross-coupling of unsaturated oxime esters with readily available arylhalides, providing an expedient approach for constructing pyrroline derivatives. The absence of organometallic reagents enables the reaction to occur under mild conditions with a broad substrate scope and good functional group tolerance. Moreover, other C-based electrophiles, including alkenyl, alkynyl and alkylhalides, or
在此,我们公开了通过镍催化的不饱和肟酯与容易获得的芳基卤化物的还原交叉偶联对烯烃进行一般且实用的亚氨基化,为构建吡咯啉衍生物提供了一种权宜之计。不存在有机金属试剂使反应能够在温和的条件下发生,具有广泛的底物范围和良好的官能团耐受性。此外,其他基于 C 的亲电子试剂,包括烯基、炔基和烷基卤化物或假卤化物,也是该反应的合适底物。
Deoxygenation of oximes for the synthesis of pyrrolines via hydroimination cyclization
we report the generation of iminyl radicals through photocatalytic deoxygenation of oximes with trivalent phosphine. The hydroiminationreaction proceeded via β-scission of a phosphoranyl radical, followed by 5-exo-trig cyclization of the resulting iminyl radical. This protocol transforms oximes, including alkyl oximes, into a variety of pyrrolines in moderate to good yields. A radical clock experiment