Metal-Free Amidation of Ethers with N,N-Dibromosulfonamides
摘要:
A new metal-free amidation of ethers with N,N-dibromosulfonamides has been developed. A series of hemiaminal ethers or imines were prepared with moderate to good yields.
Imido Transfer from Bis(imido)ruthenium(VI) Porphyrins to Hydrocarbons: Effect of Imido Substituents, C−H Bond Dissociation Energies, and Ru<sup>VI/V</sup> Reduction Potentials
(BDE) of the hydrocarbons. A linear correlation was observed between log k' (k' is the k2 value divided by the number of reactive hydrogens) and BDE and between log k2 and E(1/2)(Ru(VI/V)); the linearity in the former case supports a H-atom abstraction mechanism. The amidation by [Ru(VI)(TMP)(NNs)2] reverses the thermodynamic reactivity order cumene > ethylbenzene/toluene, with k'(tertiary C-H)/k'(secondary
Metal-free amidation of ether sp<sup>3</sup> C–H bonds with sulfonamides using PhI(OAc)<sub>2</sub>
作者:Jesús Campos、Sarah K. Goforth、Robert H. Crabtree、T. Brent Gunnoe
DOI:10.1039/c4ra09665g
日期:——
Ether C–H bonds can be selectively amidated using simple sulfonamides and iodine oxidants in the absence of a metal catalyst.
乙醚中的C-H键可以在无金属催化剂的情况下,利用简单的磺胺化合物和碘氧化剂进行选择性酰胺化。
Phosphorous acid–assisted electrochemical α-tetrahydrofuranylation of sulfonamides and amides
作者:Zhuang Wang、Yuxiu Liu、Hongjian Song、Qingmin Wang
DOI:10.1039/d3gc00079f
日期:——
protocol for phosphorous acid–assisted synthesis of hemiaminal ethers by means of α-C(sp3)–H/N–H cross-coupling reactions between tetrahydrofuran and sulfonamides or amides. This protocol does not require a chemical oxidant and can be performed at room temperature. Various sulfonamides and amides were suitable substrates, giving moderate to high yields of the desired cross-coupling products.
dehydroxymethylative functionalization reaction of aliphatic alcohols under mild and catalyst-free conditions, representing a new paradigm for forging various C(sp3)–heteroatom bonds between diverse alkanols and N- or O-centered nucleophiles. In addition, detailed mechanistic investigations have been carried out, revealing that these reactions proceed through a β-scission/anodic oxidation/nucleophilic