Cascade reactions are an important strategy in reaction design, allowing streamlining of chemical synthesis. Here we report a cascade Suzuki–Miyaura/Diels–Alder reaction, employing vinyl Bpin as a bifunctional reagent in two distinct roles: as an organoboron nucleophile for cross-coupling and as a Diels–Alder dienophile. Merging these two reactionsenables a rapid and operationally simple synthesis
Synthesis of Unsymmetrical Pyrazines Based on α-Diazo Oxime Ethers
作者:Nicole S. Y. Loy、Sunggak Kim、Cheol-Min Park
DOI:10.1021/ol5034173
日期:2015.2.6
Synthesis of unsymmetrically substituted pyrazines has been a challenge. The reactivity of α-imino carbenoids derived from α-diazo oxime ethers has been exploited for pyrazinesynthesis, in which the reaction of α-diazo oxime ethers with 2H-azirines provides highly substituted pyrazines in good to excellent yields.
Zn-ProPhenol Catalyzed Enantioselective Mannich Reaction of 2<i>H</i>-Azirines with Alkynyl Ketones
作者:Barry M. Trost、Chuanle Zhu
DOI:10.1021/acs.orglett.0c03737
日期:2020.12.18
The enantioselective Mannich reaction of 2H-azirines with alkynyl ketones is achieved under Zn-ProPhenol catalysis, delivering various aziridines with vicinal tetrasubstituted stereocenters in high yields with excellent enantioselectivities. The bimetallic Zn-ProPhenol complexes activate both the nucleophile and the electrophile in the same chiral pocket. A unique intramolecular hydrogen bond is observed
A continuous flow electrochemical reactor using readily available metal wires and carbon fibers as electrodes: environmentally benign halogenations of alkenes, alkynes, and aromatics
作者:Yinqing Xie、Long Lin、Bo Xu
DOI:10.1039/d4gc01503g
日期:——
Teflon tubing, known for its chemical resistance and temperature tolerance, served as the flow channels. The flow length and material of the electrodes can be easily adjusted. Moreover, precise control of the reaction temperature is possible. As a proof of concept, environmentally benign halogenations of alkenes, alkynes, and aromatics were developed using easy-to-handle halide salts such as LiBr and LiCl