METHOD FOR SYNTHESIS OF HALOPYRIDYL-ACYCLOPENTANE DERIVATIVE AND INTERMEDIATE THEREOF
申请人:——
公开号:US20020010339A1
公开(公告)日:2002-01-24
The present invention relates to a method for synthesis of an optically active halopyridyl-azacyclo-pentane derivative and the intermediate thereof which comprises preparing an optically active allene-1,3-dicarboxylic acid ester derivative from an optically active acetonedicarboxylic acid ester derivative and then proceeding through a 7-azabicyclo[2.2.1]heptane derivative to obtain the objective product.
Die vorliegende Erfindung betrifft eine Flüssigkristallanzeige des PSA-(polymer sustained alignment) Typs, sowie neue Flüssigkristallmedien und neue polymerisierbare Verbindungen zur Verwendung in PSA-Anzeigen.
Chiral HPLC (high-performance liquid chromatographic) stationary phases. 4. Separation of the enantiomers of bi-.beta. naphthols and analogs
作者:William H. Pirkle、James L. Schreiner
DOI:10.1021/jo00337a033
日期:1981.11
Asymmetric Epoxidation of α,β-Unsaturated Ketones Catalyzed by Chiral Polybinaphthyl Zinc Complexes: Greatly Enhanced Enantioselectivity by a Cooperation of the Catalytic Sites in a Polymer Chain
作者:Hong-Bin Yu、Xiao-Fan Zheng、Zhi-Ming Lin、Qiao-Sheng Hu、Wei-Sheng Huang、Lin Pu
DOI:10.1021/jo990749w
日期:1999.10.1
Polybinaphthyl zinc catalysts have been developed for the asymmetric epoxidation of alpha,beta-unsaturated ketones in the presence of tert-butyl hydroperoxide. Up to 81% ee has been achieved for the epoxidation of alpha,beta-unsaturated ketones containing beta-aliphatic substituents by using a binaphthyl polymer combined with diethylzinc. A very interesting positive cooperative effect of the catalytic sites in the polymer chain is observed which leads to greatly increased enantioselectivity over the corresponding monomer ligands.