Chiral Naphthyl-C2-Indole as Scaffold for Phosphine Organocatalysis: Application in Asymmetric Formal [4 + 2] Cycloaddition Reactions
作者:Tingting He、Lei Peng、Shan Li、Fangli Hu、Chuandong Xie、Shengli Huang、Shiqi Jia、Wenling Qin、Hailong Yan
DOI:10.1021/acs.orglett.0c02519
日期:2020.9.4
naphthyl-C2-indole bifunctional phosphine organocatalyst in stereoselective formal [4 + 2] cycloadditionreactions were reported. The chiral naphthyl-C2-indole skeleton was introduced to bifunctional phosphine organocatalysis for the first time, and excellent stereocontrol was achieved in two types of formal [4 + 2] cycloadditionreactions. With the optimal catalyst, a series of chiral spirooxindole and hydrodibenzofuran
A One‐Pot Ring‐Opening/Ring‐Closure Sequence for the Synthesis of Polycyclic Spirooxindoles
作者:Ji‐Wei Ren、Qing‐Lan Zhao、Jun‐An Xiao、Peng‐Ju Xia、Hao‐Yue Xiang、Xiao‐Qing Chen、Hua Yang
DOI:10.1002/chem.201900409
日期:2019.3.27
One‐pot ring‐opening/ring‐closure process of combining methyleneindolinone with 3‐aminooxindole has been developed in this work. Novel polycyclic spirooxindoles were efficiently assembled under mild conditions in high yields (up to 95 %) with moderate to good diastereoselectivities (up to >95:5 d.r.) through simple filtration.
Efficient construction of highly functionalized spiro[γ-butyrolactone-pyrrolidin-3,3′-oxindole] tricyclic skeletons via an organocatalytic 1,3-dipolar cycloaddition
作者:Long Wang、Xiao-Mei Shi、Wei-Ping Dong、Li-Ping Zhu、Rui Wang
DOI:10.1039/c3cc40669e
日期:——
Highly functionalized spiro[gamma-butyrolactone-pyrrolidin-3,3'-oxindole] tricyclic skeletons were delivered successfully with high optical purity using an effective yet simple procedure.
A highly efficient catalytic asymmetric Diels-Alderreaction between 3-vinylindoles and methyleneindolinones has been achieved using chiral N,N'-dioxide-Ni(II) complexes as the catalysts. A wide variety of substrates were readily tolerated, generating exclusively the corresponding exo-carbazolespirooxindole derivatives in excellent yields with high enantiomeric excesses (up to 98% yield, >99 : 1 d
classical Pinnick oxidation into a new and promising oxidative lactonization reaction is reported. Chiral 3-oxindolepropionic aldehydes, Michael adducts of 3-olefinic oxindoles with aliphatic aldehydes, are directly converted to spirocyclic oxindole-γ-lactones solely by sodium chlorite via a tandem Pinnick oxidation/chlorination/substitution sequence. This reaction uses waste ClO– generated in the initial