Copper-Catalyzed Carbonylative Synthesis of β-Homoprolines from <i>N</i>-Fluoro-sulfonamides
作者:Youcan Zhang、Zhiping Yin、Xiao-Feng Wu
DOI:10.1021/acs.orglett.0c00227
日期:2020.3.6
A new methodology for the carbonylative transformation of N-fluoro-sulfonamides into N-sulfonyl-β-homoproline esters has been described. In the presence of a catalytic amount of Cu(OTf)2, a range of β-homoproline derivatives were prepared in moderate to good yield. The reaction proceeds via the intramolecular cyclization and intermolecular carbonylation of a free carbon radical. Notably, this procedure
Highly Selective Palladium-Catalyzed Intramolecular Chloroamination of Unactivated Alkenes by Using Hydrogen Peroxide as an Oxidant
作者:Guoyin Yin、Tao Wu、Guosheng Liu
DOI:10.1002/chem.201102776
日期:2012.1.9
Cheap and clean! A novel Pd‐catalyzed oxidative intramolecularchloroamination of unactivatedalkenes has been developed by usinghydrogenperoxide as an oxidant and CaCl2 as a chlorine source. A series of chlorinated piperidine derivatives has been obtained with high regio‐ and diastereoselectivities at room temperature (see scheme).
Enantioselective copper-catalyzed cyclization of γ-alkenylsulfonamides and a δ-alkenylsulfonamide in the presence of a range of vinyl arenes results in variously functionalized 2-substituted chiral nitrogen heterocycles via a formal alkene C-H functionalization process. Application of this reaction to the concise synthesis of a 5-HT(7) receptor antagonist is demonstrated.
mCPBA-mediated metal-free intramolecular aminohydroxylation and dioxygenation of unfunctionalized olefins
作者:Gong-Qing Liu、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1039/c5ra09024e
日期:——
mCPBA-mediated metal-free intramolecular aminohydroxylation and dioxygenation reactions of unfunctionalizedolefins are reported. In the presence of 1.2 equiv. of m-chlorobenzoic peracid, different N-sulfonyl 4-penten-1-amine substrates could be cyclized via epoxide intermediates, producing the corresponding 2-hydroxymethylpyrrolidine products in up to 92% yields. The reaction could be carried out
Flexible Gold-Catalyzed Regioselective Oxidative Difunctionalization of Unactivated Alkenes
作者:Teresa de Haro、Cristina Nevado
DOI:10.1002/anie.201005763
日期:2011.1.24
AuI/AuIIIcatalyticcycles can trigger three highly regioselective alkene difunctionalization processes that involve the formation of C(sp3)O, C(sp3)N, and C(sp3)C(sp2) bonds. The reaction can proceed by reductive elimination on the oxidized gold center with complete retention of the configuration or through two subsequent nucleophilic substitution reactions via an aziridine intermediate.