ASYMMETRIC HYDROGENATION METHOD FOR KETONE COMPOUND
申请人:Zhang Wanbin
公开号:US20130053574A1
公开(公告)日:2013-02-28
The invention relates to an asymmetric hydrogenation method for ketone compounds, comprising the step of: under hydrogen atmosphere, in the presence of an in situ catalyst derived from a chiral ligand and a ruthenium salt, adding a ketone compound and a base into a second solvent to carry out an asymmetric hydrogenation for the ketone compound. The invention can obtain a conversion of 100% and a highest asymmetric inducement effect of 99.7% for the ketone compound. The invention has the advantages including simple procedure, high conversion and selectivity, good atom economy and good prospect of industrial application.
Some α-haloketones react with furan in methanolic solution in the presence of base to form the 3-oxo-8-oxabicyclo[3.2.1]oct-6-enes (), the products derived from a [4+3] cycloaddition of an allylium intermediate ( or ).
α-Methoxyketone synthesis via ketone homologation: ZrCl<sub>4</sub>-mediated hydroxy sulfone rearrangements
作者:John G. Montana、Neil Phillipson、Richard J. K. Taylor
DOI:10.1039/c39940002289
日期:——
The adducts between ketones and the anion derived from [(methoxymethyl)sulfonyl]benzene undergo efficient, regioselective rearrangement to give α-methoxyketones when treated with ZrCl4 and HfCl4; this new procedure allows the sulfone-mediated homologation methodology to be applied to monocyclic and acyclic ketones.
New Methylene Homologation Method for Cyclic Ketones
作者:Huaqing Liu、Chunrui Sun、Nam-Kyu Lee、Roger F. Henry、Daesung Lee
DOI:10.1002/chem.201201346
日期:2012.9.17
Teaching new tricks to an old dog: By intercepting adducts between ketones and lithium trimethylsilyldiazomethane, a new Tiffeneau–Demjanov type methylenehomologation could be realized in a single‐step operation. Among proton sources and Lewis acids, silica gel was found to be the most effective reagent for the protonation of intermediates and their subsequent ring expansion (see scheme).
Reaction of Enol Ethers with Lead Tetraacetate: An Improved Method for the Synthesis of α-Methoxy Ketones<sup>#</sup>
作者:V. S. Singh、C. Singh、D. K. Dikshit
DOI:10.1080/00397919808005072
日期:1998.1
Abstract The reaction of cyclic enol ethers with leadtetraacetate in methanol in the presence of BF3.Et2O at 0°C gives α- methoxy cyclic ketones. #Communication No 5664 from Central Drug Research Institute, Lucknow
摘要 在 BF3.Et2O 存在下,环状烯醇醚与四乙酸铅在甲醇中于 0°C 反应生成 α-甲氧基环酮。#Communication No 5664 来自勒克瑙中央药物研究所