Iron-catalyzed acylation-functionalization of unactivated alkenes with aldehydes
作者:Tian Tian、Xin Wang、Leiyang Lv、Zhiping Li
DOI:10.1039/d0cc06774a
日期:——
Herein, an iron-catalyzed acylation-functionalization of unactivatedalkenes with aldehydes via distal group ipso-migration is reported. This strategy overcame the energy barrier and reversibility in the difunctionalization of unactivatedalkenes with nucleophilic acyl radicals, and a variety of β-heteroarylated, -cyanated and -oximated unsymmetrical 1,6- and 1,7-diketones were obtained regioselectively
Here we describe a metal-free amino-heteroarylation of unactivatedolefins via organic photoredox catalysis, providing a concise and efficient approach for the rapid synthesis of various δ (β, ε)-amino ketones under mild conditions. This protocol demonstrates that the new photocatalyst Cz-NI developed by our group has an excellent photoredox catalytic performance. Finally, a series of mechanistic experiments
Visible-light-induced consecutive C–C bond fragmentation and formation for the synthesis of elusive unsymmetric 1,8-dicarbonyl compounds
作者:Meishan Ji、Zhen Wu、Chen Zhu
DOI:10.1039/c9cc00378a
日期:——
Synthesis of the valuable unsymmetric 1,8-dicarbonyl compounds remains underexplored currently. Herein, we disclose a new strategy for the synthesis of 1,8-diketones through the coupling of cyclopropanols and cyanohydrins under visible-light irradiation. The protocol features a cascade of intriguing ring opening of cyclopropanols and remote cyano migration. The unfavorable addition of an alkyl radical
Visible-light induced generation of bifunctional nitrogen-centered radicals: a concise synthetic strategy to construct bicyclo[3.2.1] octane and azepane cores
A photocatalytic tandem cyclization of o-alkenylbenzaldehydes using pyridinium salts as the amination reagent is described. A variety of valuable seven-membered nitrogenous heterocyclic skeletons are prepared in modest to excellent yields in concise one-step. This transformation features mild reaction conditions and exceptional functional group tolerance. In addition, combining control experiments and density functional theory (DFT) calculations on the mechanism can explain the reaction selectivity.
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