Photoinduced Diverse Reactivity of Diazo Compounds with Nitrosoarenes
作者:Sourav Roy、Gourav Kumar、Indranil Chatterjee
DOI:10.1021/acs.orglett.1c02279
日期:2021.9.3
A diverse reactivity of diazo compounds with nitrosoarene in an oxygen-transfer process and a formal [2 + 2] cycloaddition is reported. Nitosoarene has been exploited as a mild oxygen source to oxidize an in situ generated carbene intermediate under visible-light irradiation. UV-light-mediated in situ generated ketenes react with nitosoarenes to deliver oxazetidine derivatives. These operationally
Chemo- and Enantioselective Brønsted Acid-Catalyzed Reduction of α-Imino Esters with Catecholborane
作者:Dieter Enders、Andreas Rembiak、Bianca Anne Stöckel
DOI:10.1002/adsc.201300352
日期:2013.7.8
The chemo‐ and enantioselectivereduction of α‐imino esters with catecholborane has been developed employing 10 mol% of an enantiopure BINOL‐based phosphoric acid as organocatalyst. Various differently substituted aromatic α‐amino acid derivatives can be achieved in almost quantitative yields and very good to excellent enantioselectivities of up to 96% ee under mild reaction conditions.
A Vaulted Biaryl Phosphoric Acid-Catalyzed Reduction of α-Imino Esters: The Highly Enantioselective Preparation of α-Amino Esters
作者:Guilong Li、Yuxue Liang、Jon C. Antilla
DOI:10.1021/ja070519w
日期:2007.5.1
A new method for the chiral phosphoric acid-catalyzedreduction of α-iminoesters using Hantzsch ester is described. A series of 11 α-iminoesters were evaluated, and it was shown that imino substrates derived from substituted aryl and alkyl keto esters could be reduced to the corresponding α-amino ester in excellent yield and in enantiomeric excesses from 94 to 99%. Catalyst loading was 5 mol % in
Photoredox-Catalyzed Synthesis of α-Amino Acid Amides by Imine Carbamoylation
作者:Luana Cardinale、Mattis-Ole W. S. Schmotz、Mikhail O. Konev、Axel Jacobi von Wangelin
DOI:10.1021/acs.orglett.1c03908
日期:2022.1.21
An operationally simple protocol for the photocatalytic carbamoylation of imines is reported. Easily available, bench-stable 4-amido Hantzschesterderivatives serve as precursors to carbamoyl radicals that undergo rapid addition to N-aryl imines. The reaction proceeds under blue light irradiation in the presence of the photocatalyst 3DPAFIPN and Brønsted/Lewis acid additives. Mechanistic studies indicated
Reductive Cleavage of Secondary Sulfonamides: Converting Terminal Functional Groups into Versatile Synthetic Handles
作者:Patrick S. Fier、Suhong Kim、Kevin M. Maloney
DOI:10.1021/jacs.9b10985
日期:2019.11.20
considered as terminalfunctionalgroups rather than synthetic handles. To enable the general late-stage functionalization of secondary sulfonamides, we have developed a mild and general method to reductively cleave the N-S bonds of sulfonamides to generate sulfinates and amines, components which can further react in situ to access a variety of other medicinally relevant functionalgroups. The utility