A carbonylative Mizoroki–Heck reaction using alkyl iodides was achieved with a Pd/photoirradiation system using DBU as a base. In this reaction, alkyl radicals were formed from alkyl iodides via single-electrontransfer (SET) and then underwent a sequential addition to CO and alkenes to give β-keto radicals. It is proposed that DBU would abstract a proton α to carbonyl to form radical anions, giving
Multisubstituted Cyclohexene Construction through Telescoped Radical-Addition Induced Remote Functional Group Migration and Horner–Wadsworth–Emmons (HWE) Olefination
作者:Xing-Gui Zhang、Xin Li、Chi Zhang、Chao Feng
DOI:10.1021/acs.orglett.1c03821
日期:2021.12.17
photoredox-promoted alkene difunctionalization via remotefunctional group migration with concomitant intramolecular Horner–Wadsworth–Emmons (HWE) olefination. The characteristic feature of this protocol resides in the fact that the follow-up requiring ketone functionality for ring-closing olefination is in situ unveiled from the otherwise inert tertiary alcohol by the preceding alkene difunctionalization
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。
Palladium‐Catalyzed Inverse and Normal Dehydrogenative Aza‐Morita–Baylis–Hillman Reactions with γ,δ‐Unsaturated Compounds
A Pd0complex can mediate dehydrogenative formation of 2,4-diene systems from γ,δ-unsaturated carbonyls in the presence of 2,6-DMBQ (2,6-dimethyl-1,4-benzoquinone), which undergo vinylogous addition to imines via auto-tandem Pd0-π-Lewis base catalysis. Both chemically inverse δ-regioselective aza-Morita–Baylis–Hillman adducts and α-regioselective normal ones are obtained switchably and stereoselectively