Free radical-mediated alkylation of general alkenes is a challenging and largely unmet goal. Herein, we disclose a conceptually novel "polarity umpolung" strategy for radical alkylation of alkenes using a portfolio of easily-accessed, dual-function alkylating reagents. This is achieved by substituting inherently nucleophilic alkyl radicals with electrophilic sulfone-decorated surrogates, thus inverting
Palladium-Catalyzed Intermolecular Azidocarbonylation of Alkenes via a Cooperative Strategy
作者:Ming Li、Feng Yu、Pinhong Chen、Guosheng Liu
DOI:10.1021/acs.joc.7b01812
日期:2017.11.17
alkene activation and palladium-catalyzed carbonylation was demonstrated as an efficient strategy for the difunctionalization of alkenes. A variety of β-azido carboxylic esters were obtained from mono- and 1,1-disubstituted terminal alkenes with excellent regioselectivities. In addition, the introduced azido group can be reduced to an amine group, providing a facile access to β-aminoacid derivatives
Heterocyclization Reagents for Rapid Assembly of N‐Fused Heteroarenes from Alkenes
作者:Huihui Zhang、Min Wang、Xinxin Wu、Chen Zhu
DOI:10.1002/anie.202013089
日期:2021.2.15
N‐Fused heterocycles are of particular use and upmost importance in multiple fields. Herein, we disclose a conceptually new approach for the rapidassembly of N‐fusedheteroarenesfromalkenes. A portfolio of strategically designed heterocyclizationreagents are readily prepared for the cascade reaction. A plethora of N‐fusedheteroarenes including seven types of heterocyclic core are furnished. The
A Pd-catalyzed hydrothiocarbonylation of unactivated terminal alkenes is presented. According to this protocol, aliphatic thioesters were synthesized with exclusive linear selectivity under mild reaction conditions. Good to excellent yields (up to 91% yield), broad substrate scope, broad functional group tolerance, and utility of the method demonstrated the advantages of this protocol.
Transition-Metal-Free, Intermolecular Azidoheteroarylation of Alkenes: Efficient Access to β-Azidoalkylated Quinoxalinones and Preliminary Antifungal Evaluation Against Magnaporthe grisea
作者:Weiwei Qin、Zhaodong Li、Yiming Du、Yue Chen、Yun-Lin Liu
DOI:10.1055/s-0040-1707514
日期:2020.8
alkenes under transition-metal-free conditions is reported by employing TMSN3 and quinoxalin-2(1H)-ones as coupling partners. This domino reaction allows an efficient synthesis of valuable orangoazides containing quinoxalin-2(1H)-onederivatives and could be extended to phosphinyl-alkylated quinoxalin-2(1H)-one in a single step in moderate to excellent yields under mild conditions, as demonstrated by the