Efficient Synthesis of Epoxides from Vicinal Diols Via Cyclic Sulfates
摘要:
Reaction of cyclic sulfates of vic-diols with sodium hydroxide in THF-MeOH produced the corresponding epoxides in excellent isolated yields at room temperature. Cyclic sulfates of trans-diols gave cis-epoxides, and cyclic sulfates of cis-diols afforded trans-epoxides exclusively. Various cyclic sulfates of vic-diols can be converted into the epoxides under the conditions.
Chiral Rhodium Complexes Derived From Electron-Rich Phosphine-Phosphites as Asymmetric Hydrogenation Catalysts
作者:Pablo Etayo、José L. Núñez-Rico、Anton Vidal-Ferran
DOI:10.1021/om200933b
日期:2011.12.26
Two new chiral cationic rhodium(I) complexes derived from electron-rich dicyclohexylphosphine-phosphite ligands were prepared from enantiopure Sharpless epoxy ethers. The best-performing catalyst system, which bears a less bulky methyl ether moiety, exhibited remarkably high enantioselectivity (up to 99% ee) and reactivity (up to >2500 TON) in asymmetric hydrogenation reactions of various functionalized
Oxyanionic substituent effect on the carbon-hydrogen insertion of carbenes. Reaction of alkoxides with dichlorocarbene and chlorophenylcarbene
作者:Toshiro Harada、Eiji Akiba、Akira Oku
DOI:10.1021/ja00347a042
日期:1983.5
Phosphinooxazolines Derived from 3-Amino-1,2-diols: Highly Efficient ModularP-N Ligands
作者:Dana Popa、Cristina Puigjaner、Montserrat Gómez、Jordi Benet-Buchholz、Anton Vidal-Ferran、Miquel A. Pericàs
DOI:10.1002/adsc.200600599
日期:2007.10.8
palladium complexes have been used as chiral mediators in the asymmetric allylic alkylation reaction. The oxazoline moiety in 12 contains a C-4 aryl and a C-5 alkoxymethyl substituent that can be independently optimized for high catalytic activity and enantioselectivity. A methoxymethyl substituent at C-5 has been found to provide the best results in terms of enantioselectivity and activity in the alkylation
Efficient Synthesis of Epoxides from Vicinal Diols <i>Via</i> Cyclic Sulfates
作者:Doo Ok Jang、Yung Hyup Joo、Dae Hyan Cho
DOI:10.1080/00397910008087077
日期:2000.12.1
Reaction of cyclic sulfates of vic-diols with sodium hydroxide in THF-MeOH produced the corresponding epoxides in excellent isolated yields at room temperature. Cyclic sulfates of trans-diols gave cis-epoxides, and cyclic sulfates of cis-diols afforded trans-epoxides exclusively. Various cyclic sulfates of vic-diols can be converted into the epoxides under the conditions.