An efficient organocatalytic enantioselective synthesis of spironitrocyclopropanes
作者:Utpal Das、Yi-Ling Tsai、Wenwei Lin
DOI:10.1039/c2ob26943k
日期:——
An organocatalytic asymmetric synthesis of spironitrocyclopropanes has been demonstrated starting from 2-arylidene-1,3-indandiones and bromonitroalkanes catalyzed by a cinchona-derived bifunctional organocatalyst. The products were obtained with excellent enantioselectivities, diastereoselectivities and with good yields.
Palladium-Catalyzed Enantioselective Cycloaddition of Carbonylogous 1,4-Dipoles: Efficient Access to Chiral Cyclohexanones
作者:Barry M. Trost、Zhiwei Jiao
DOI:10.1021/jacs.0c11535
日期:2020.12.30
A novel palladium-mediated carbonylogous 1,4-dipole was developed by in situ deprotonation. By using our own-developed C2-unsymmetric phosphoramidite as supporting ligand, this dipole was applied to the asymmetric synthesis of chiral cyclohexanones via a catalytic [4+2] cycloaddition. Electron-deficient allyliccarbonate was used to generate the highly reactive palladium-mediated dipoles for the first
A copper‐catalyzed intermolecular [3+2] annulation of 2‐arylidene‐1,3‐indandiones with N‐acetyl enamides has been developed to assemble spirocyclic pyrrolines, which are important building blocks for organic synthesis and drug discovery. This heteroannulation protocol tolerates various functional groups and proceeds in good to excellent yields. Mechanistic studies reveal that the reactions might involve
Diastereoselective [3 + 3] cycloaddition reaction of 2-arylideneindan-1,3-diones with β-naphthols: Efficient assemble of immunosuppressive pentacyclic chromanes
作者:Na Li、Liang Tu、Guiguang Cheng、Houling Sa、Zhenghui Li、Tao Feng、Yongsheng Zheng、Jikai Liu
DOI:10.1016/j.tetlet.2019.151579
日期:2020.3
A basepromoted diastereoselective formal [3+3] cycloaddition reaction of 2-arylideneindan-1,3-diones with β-naphthols towards the synthesis of functionalized pentacyclic indeno[1], [2], [2](a), [2](b)chromen-(4bH)-ones has been developed. This methodology is appreciated in terms of diastereoselectivity and mild conditions. In addition, the immunosuppressive assay indicates that one of the products
Phosphine-Initiated Domino Reaction: A Convenient Method for the Preparation of Spirocyclopentanones
作者:Ling Liang、Erqing Li、Peizhong Xie、You Huang
DOI:10.1002/asia.201301641
日期:2014.5
An efficient synthetic approach has been developed for the construction of the spirocyclopentanone skeleton via a phosphine‐catalyzed [3+2] annulation reaction. With this novel and economical protocol, various quaternary carbon‐centered spirocyclopentanones could be readily obtained.