Aqueous Copper Nitrate Catalyzed Synthesis of 3-Alkylideneoxindoles from α-Diazo-β-ketoanilides
作者:Shanyan Mo、Zhanhui Yang、Jiaxi Xu
DOI:10.1002/ejoc.201402206
日期:2014.6
An economical, practical, and green protocol with which to synthesize 3-alkylideneoxindolesfromα-diazo-β-ketoanilides has been developed. The approach employs inexpensive Cu(NO3)2·3H2O as catalyst and environmentally friendly water as solvent, and achieves moderate to excellent yields. The method has good tolerance to a range of N-alkyl and N-aryl groups, including electron-withdrawing and electron-donating
Palladium‐Catalyzed Cascade C−H Functionalization/Asymmetric Allylation Reaction of Aryl α‐Diazoamides and Allenes: Lewis Acid Makes a Difference
作者:Min‐Song Wu、Xiao‐Yun Ruan、Zhi‐Yong Han、Liu‐Zhu Gong
DOI:10.1002/chem.202104218
日期:2022.2.21
An achiral Lewis acid enables chiral palladium complex-catalyzed cascade C−H functionalization/asymmetric allylation reaction of aryl α-diazoamides and allenes to give synthetically useful chiral 3,3-disubstituted oxindole derivatives in enhanced yield and enantioselectivity (up to 93 % ee).
chemo‐selective Rh(II)/Pd(0) dual catalysis that promotes one‐pot synthesis of C3‐quaternary allylic oxindoles from N‐aryl‐α‐diazo‐β‐ketoamides and functionalized allyl carbonates in good to excellent yields has been developed. The efficiency of this transformation relies on the choice of Rh(II)/Pd(0) dual catalysis strategy that enabled cascade intramolecular aryl C−H insertion and allylic alkylation
Ruthenium-catalyzed C–H functionalization was successfully combined with palladium-catalyzed asymmetricallylicalkylation in one pot. The novel dual-metal-catalyzed reaction provides a variety of 3-allyl-3-aryl oxindoles from the corresponding α-diazoamides in up to 99% yield with up to 85% ee. The appropriate ligand choice is important to promote the sequential reaction, avoiding undesired metal
Silver catalyzed intramolecular cyclization for synthesis of 3-alkylideneoxindoles via C–H functionalization
作者:Hong-Li Wang、Zhe Li、Gang-Wei Wang、Shang-Dong Yang
DOI:10.1039/c1cc14394h
日期:——
A novel protocol for the preparation of various 3-alkylideneoxindoles via a silver-catalyzed aromatic CâH functionalization has been developed. The process is simple, environmentally conscious, and avoids the use of abundant bases, oxidants, or other additives.