Cross coupling of sulfonyl radicals with silver-based carbenes: a simple approach to β-carbonyl arylsulfones
作者:Hanghang Wang、Pengcheng Lian、Yonggao Zheng、Jingjing Li、Xiaobing Wan
DOI:10.1039/d0ob00091d
日期:——
A radical–carbene coupling reaction of sulfonyl radicals and silver-based carbenes has been well established, which provides an efficient approach to various β-carbonyl arylsulfones.
Investigation of the Transition-Metal- and Acid-Catalyzed Reactions of β-(<i>N</i>-Tosyl)amino Diazo Carbonyl Compounds
作者:Nan Jiang、Zhihua Ma、Zhaohui Qu、Xiaoyu Xing、Linfeng Xie、Jianbo Wang
DOI:10.1021/jo0259818
日期:2003.2.1
beta-(N-tosyl)amino diazo carbonyl compounds have been prepared by nucleophilic condensation of N-tosylimines with acyldiazomethanes. The diazodecomposition of these diazo carbonyl compounds under various catalytic conditions, including Rh(II) carboxylates, Cu(I) and Cu(II) complexes, PhCO(2)Ag/Et(3)N, TsOH, and SnCl(2).2H(2)O, has been investigated. It was found that, in most cases, the diazodecomposition gave
Direct Carboxylation of the Diazo Group <i>ipso</i>-C(sp<sup>2</sup>)–H bond with Carbon Dioxide: Access to Unsymmetrical Diazomalonates and Derivatives
作者:Qianyi Liu、Man Li、Rui Xiong、Fanyang Mo
DOI:10.1021/acs.orglett.7b03573
日期:2017.12.15
The directcarboxylation of the ipso-C(sp2)–H bond of a diazo compound with carbondioxide under mild reaction conditions is described. This method is transition-metal-free, uses a weak base, and proceeds at ambient temperature under atmospheric pressure in carbondioxide. The carboxylation exhibits high reactivity and is amenable to subsequent diversification. A series of unsymmetrical 1,3-diester/keto/amide
Intramolecular carbenoid CH insertion of five α-diazoacetamides [N2CHCONR2, NR2=NEt2 (3a), NBu2 (3b), N(i-Pr)2 (3c), N(CH2Ph)2 (3d), N(i-Pr)(CH2Ph) (3e)], was investigated using as catalysts dinuclear Ru(I,I) complexes of the type [Ru2(μ-L1)2(CO)4L22], where L1 is a bidentate bridging acetate, calix[4]arenedicarboxylate, saccharinate, pyridin-2-olate, or triazenide ligand, as well as [RuCl2(p-cymene)]2
paper reports on the selective conversion of alkyl azido groups at the carbonyl α-position to diazo compounds. Through β-elimination of dinitrogen, followed by hydrazone formation/decomposition, α-azidocarbonyl moieties were transformed into α-diazo carbonyl groups in one step. As these reaction conditions do not involve aryl or general alkyl azides, site-selective conversions of di- and triazides were