A series of N-benzylbenzenesulfonamides were synthesized and their biological activities were tested. Among these compounds, N-(2,3-epoxypropyl)-N-(α-methylbenzyl)benzenesulfonamide derivatives were found to be the most active against barnyardgrass and to have physiological selectivity between barnyardgrass and rice plants.
作者:Yuehua Chen、Boxuan Yang、Qian-Yu Li、Yu-Mei Lin、Lei Gong
DOI:10.1039/d2cc05569d
日期:——
Transition metal- and photosensitizer-free C(sp3)–H (sulfonyl)amidationreactions have been realized by employing Selectfluor® as a versatile reagent, functioning as a photoactive component, a HAT precursor and an oxidant. Various toluene derivatives, cycloalkanes, natural products and bioactive molecules can be converted into N-containing products under mild conditions in good yield and with high
Nickel-catalysed addition of dialkylzinc reagents to N-phosphinoyl- and N-sulfonylimines
作者:Raquel Almansa、David Guijarro、Miguel Yus
DOI:10.1016/j.tet.2006.11.056
日期:2007.1
A catalytic amount of a nickel complex (0.1-5.3 mol %) extraordinarily increases the reaction rate of the addition of dialkylzinc reagents to N-(diphenylphosphinoyl)- or N-(benzenesulfonyl)imines. The reaction of imines derived from both aromatic and aliphatic aldehydes with various dialkylzinc reagents in the presence of several nickel complexes gives the expected addition products in most cases in I h and in very good yields. In general, the formation of reduction by-products was not an important side reaction. The process represents a great improvement, with regard to the reaction rate and the yield of the addition products, in comparison with the reactions performed in the absence of the nickel catalyst, and reaction times are much shorter than the ones reported so far using other catalysts. (c) 2006 Elsevier Ltd. All rights reserved.
Chemoselective hydroamination of vinyl arenes catalyzed by an NHC-amidate-alkoxide Pd(II) complex and p-TsOH
作者:Richard Giles、Justin O’Neill、Joo Ho Lee、Michael K. Chiu、Kyung Woon Jung
DOI:10.1016/j.tetlet.2013.05.101
日期:2013.7
The hydroamination of various substituted vinyl arenes with benzenesulfonamide was explored using an NHC-amidate-alkoxide palladium catalyst in conjunction with p-TsOH. Utilizing halide-substituted and electron-rich vinyl arenes, this methodology selectively furnished the cross-coupled hydroamination products in moderate to excellent yields in a Markovnikov fashion while greatly reducing undesired acid-catalyzed homocoupling of the vinyl arenes. Electron-rich vinyl arenes typically required milder conditions than electron-poor ones. While most effective for para-substituted substrates, the catalyst system also furnished the desired products from ortho- and meta-substituted vinyl arenes with high chemoselectivities. (C) 2013 Elsevier Ltd. All rights reserved.