[Rh<sup>III</sup>(Cp*)]-Catalyzed<i>ortho</i>-Selective Direct C(sp<sup>2</sup>)H Bond Amidation/Amination of Benzoic Acids by<i>N</i>-Chlorocarbamates and<i>N</i>-Chloromorpholines. A Versatile Synthesis of Functionalized Anthranilic Acids
作者:Fo-Ning Ng、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1002/chem.201304855
日期:2014.4.7
furnishing highly functionalized anthranilic acids. A stoichiometric reaction of a cyclometallated rhodium(III) complex of benzo[h]quinoline with a silver salt of N‐chlorocarbamate afforded an amido–rhodium(III) complex, which was isolated and structurally characterized by X‐ray crystallography. This finding confirmed that the CNbond formation results from the cross‐coupling of N‐chlorocarbamate with
Roles reversed: An efficient cobalt‐catalyzed electrophilic amination of arylzinc reagents has been achieved. A variety of functionalized arylzincs and N‐chloroamines were coupled under mild conditions (see scheme). Both secondary and tertiary arylamines were obtained in moderate to excellent yields.
Practical and efficient synthesis of N-halo compounds
作者:Yong-Li Zhong、Hua Zhou、Donald R. Gauthier、Jaemoon Lee、David Askin、Ulf H. Dolling、Ralph P. Volante
DOI:10.1016/j.tetlet.2004.12.088
日期:2005.2
A practical and efficient synthesis of N-halo compounds is described. Treatment of primary and secondary amines or amides with sodium hypohalite in the presence of tert-butanol and acetic acid afforded N-halo compounds in 90–100% yield.
Rh[III]-Catalyzed Direct C–H Amination Using<i>N</i>-Chloroamines at Room Temperature
作者:Christoph Grohmann、Honggen Wang、Frank Glorius
DOI:10.1021/ol203353a
日期:2012.1.20
An efficient Rh(III)-catalyzed direct C-H amination of N-pivaloyloxy benzamides with N-chloroamines proceeding at room temperature was achieved. The versatile directing group allows for selective mono- and diamination and can be readily converted to give valuable benzamide or aminoaniline derivatives. Mechanistic studies have been carried out to elucidate the reaction pathway.
Rhodium(III)-Catalyzed Intermolecular Direct Amination of Aromatic C–H Bonds with<i>N</i>-Chloroamines
作者:Ka-Ho Ng、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1021/ol203046n
日期:2012.1.6
A Rh(III)-catalyzed direct aromatic C-H amination is achieved using N-chloroamines as a reagent. Furthermore, we also developed a one-pot amination protocol Involving In situ chlorination of the secondary amines. The catalytic amination operates at mild conditions with excellent functional group tolerance and regioselectivity.