Palladium-Catalyzed Amidation of Unactivated C(sp<sup>3</sup>)H Bonds: from Anilines to Indolines
作者:Julia J. Neumann、Souvik Rakshit、Thomas Dröge、Frank Glorius
DOI:10.1002/anie.200903035
日期:2009.9.1
Unreactive CH to attractive CN: A palladium‐catalyzed intramolecular direct amidation of unactivated C(sp3)Hbonds combines CH activation and CN bond formation into one efficient process. Under the optimized conditions, an extraordinary tolerance of functional groups was observed, and numerous indoline derivatives were formed (see scheme).
the reaction of allyl acetate with the anionic species prepared from various N-(2-tert-butylphenyl)sulfonamides and NaH proceeded in an enantioselective manner (up to 95% ee) to give optically active N-allylated sulfonamide derivatives possessing an N–C axially chiral structure in high yields.
highly atroposelective N-acylation reaction of aniline-derived sulfonamides has been developed with chiral isothiourea as the catalyst. This approach provides a facile and efficient route to an array of atropoisomeric sulfonyl substituted anilide products in good yields with high to excellent enantioselectivities.
Cu-Catalyzed Intramolecular Amidation of Unactivated C(sp<sup>3</sup>
)−H Bonds To Synthesize N-Substituted Indolines
作者:Fei Pan、Bin Wu、Zhang-Jie Shi
DOI:10.1002/chem.201600680
日期:2016.5.4
A copper‐catalyzed intramolecularamidation of unactivated C(sp3)−H bonds to construct indoline derivatives has been developed. Such an amidation proceeded well at primary C−H bonds preferred to secondary C−H bonds. The transformation owned a broad substrate scope. The corresponding indolines were obtained in good to excellent yields. N‐Formal and other carbonyl groups were suitable and were easily
Importantly, a simple oxidation of N,O-acetal moiety and γ-addition to the versatile atropoisomeric iminium ion enabled diversity-synthesis of various valuable axially chiral sulfonamides and anilides. For example, γ-azidation of the iminium ion opened an opportunity to the synthesis of atropoisomeric non-natural amino acid derivatives and an axially chiral 8-membered cyclic sulfonamide was finally synthesized