Catalytic decarboxylative alkylation of β-keto acids with sulfonamides via the cleavage of carbon–nitrogen and carbon–carbon bonds
作者:Cui-Feng Yang、Jian-Yong Wang、Shi-Kai Tian
DOI:10.1039/c1cc12790j
日期:——
An efficient decarboxylative alkylation reaction of β-keto acids with N-benzylic or N-allylic sulfonamides has been developed, for the first time, through sequential cleavage of carbonânitrogen and carbonâcarbon bonds in the presence of 10 mol% of FeCl3.
Catalytic coupling of N-benzylic sulfonamides with silylated nucleophiles at room temperature
作者:Bai-Ling Yang、Shi-Kai Tian
DOI:10.1039/c0cc00765j
日期:——
In the presence of 2-10 mol% of Tf(2)NH, a range of N-benzylic sulfonamides smoothly react with allylic, propargylic, benzylic, or hydrido silanes at room temperature via sp(3) carbon-nitrogen bond cleavage to afford structurally diverse products in moderate to excellent yields and with high chemo- and regioselectivity.
Highly enantioselective Rh-catalyzed transfer hydrogenation of N-sulfonyl ketimines
作者:Se Hun Kwak、Sun Ah Lee、Kee-In Lee
DOI:10.1016/j.tetasy.2010.04.047
日期:2010.4
species comprising N-sulfinyl and N-sulfonyl ketimine, oxime, and enamine derivatives were subjected to asymmetric transferhydrogenation in an azeotropic mixture of formic acid/triethylamine. Among them, the Rh-catalyzed transferhydrogenation of N-sulfonyl ketimine afforded the corresponding 1-arylalkylamines in excellent yield and with high enantioselectivity.
Enantioselective, intermolecular benzylic C–H amination catalysed by an engineered iron-haem enzyme
作者:Christopher K. Prier、Ruijie K. Zhang、Andrew R. Buller、Sabine Brinkmann-Chen、Frances H. Arnold
DOI:10.1038/nchem.2783
日期:2017.7
highly selective, and renewable catalysts exist. Here we report the directedevolution of an iron-containing enzymatic catalyst—based on a cytochrome P450 monooxygenase—for the highly enantioselective intermolecular amination of benzylic C–H bonds. The biocatalyst is capable of up to 1,300 turnovers, exhibits excellent enantioselectivities, and provides access to valuable benzylic amines. Iron complexes
Catalytic CN Bond Alkynylation of<i>N</i>-Benzylic Sulfonamides with Terminal Alkynes
作者:Congrong Liu、Fulai Yang、Tingting Wang
DOI:10.1002/cjoc.201400194
日期:2014.5
of N‐benzylic sulfonamides with terminalalkynes for the synthesis of internal alkynes is reported. In the presence of 5 mol% of (Tf)2NH/Bi(OTf)3 (1:1), a broad range of N‐benzylic sulfonamides react smoothly with arylacetylenes to afford structurally diverse internal alkynes in moderate to excellent yields. We reasoned that vinyl cations could be formed by the regioselective attack of terminal alkynes