Asymmetric transfer hydrogenation reactions of <i>N</i>-sulfonylimines by using alcohols as hydrogen sources
作者:Fan Yang、Jingchao Chen、Guoli Shen、Xuexin Zhang、Baomin Fan
DOI:10.1039/c8cc01284a
日期:——
A palladium/zinc co-catalytic system was established and successfully utilized in the asymmetric transfer hydrogenation reactions of N-sulfonylimines with alcohols as hydrogensources. Simple alcohols such as methanol, ethanol and benzyl alcohols are all variable hydrogensources that can reduce various N-sulfonylimines to the corresponding chiral amines with high optical purities in presence of this
Redox Cyclization of Amides and Sulfonamides with Nitrous Oxide for Direct Synthesis of Heterocycles
作者:Zhencheng Lai、Chaorong Wang、Jiaming Li、Sunliang Cui
DOI:10.1021/acs.orglett.0c00397
日期:2020.3.6
Herein we report a redox cyclization of amides and sulfonamides with nitrousoxide (N2O) for the direct synthesis of heterocycles. Various amides and sulfonamides could undergo directed ortho metalation (DoM) by treatment with BuLi, and the lithium intermediate could be trapped by N2O gas to achieve redox cyclization. N2O serves as a N-atom donor to mediate the intramolecular coupling of lithium species
Nickel-Catalyzed Asymmetric Transfer Hydrogenation and α-Selective Deuteration of <i>N</i>-Sulfonyl Imines with Alcohols: Access to α-Deuterated Chiral Amines
A nickel-catalyzed enantioselective transferhydrogenation and deuteration of N-sulfonyl imines was developed. Excellent α-selectivity and high deuterium content were achieved by using inexpensive 2-propanol-d8 as a deuterium source. As a highlight, no deuteration of β-C–H and the remote C–H of N-sulfonyl amines occurred, which is hard to achieve using other imines or by hydrogen isotope exchange with
Chiral sulfonylamines can be efficiently synthesized in good yields by asymmetric hydrogenation of cyclic and acyclic N‐sulfonylimines co‐catalyzed by Pd/Zn(OTf)2 using hydrogen gas under ambient pressure.
Electrochemical synthesis of sulfonamides in a graphite powder macroelectrode
作者:Dmistocles A. Vicente、Danilo Galdino、Marcelo Navarro、Paulo H. Menezes
DOI:10.1039/d0gc01360a
日期:——
commercially available and non-expensive sodium salts of sulfinic acids is described. Electrooxidation reactions were carried out in a graphite powder macroelectrode using an aqueous electrolyte and cavity cell. Further reaction with primary or secondaryamines gave the corresponding sulfonamides, a unit present in several biologically active compounds and pharmaceuticals, in good yields.