Efficient and Direct Nucleophilic Difluoromethylation of Carbonyl Compounds and Imines with Me<sub>3</sub>SiCF<sub>2</sub>H at Ambient or Low Temperature
作者:Yanchuan Zhao、Weizhou Huang、Ji Zheng、Jinbo Hu
DOI:10.1021/ol202208b
日期:2011.10.7
by using a proper Lewis base activator, Me3SiCF2H can efficiently difluoromethylate various aldehydes, ketones, and imines to give the corresponding products in good to excellent yields at room temperature or even at −78 °C.
Indium-assisted aluminium-based stereoselective allylation of prostereogenic α,α-disubstituted cycloalkanones and imines
作者:Chennakesava Reddy、Srinivasarao Arulananda Babu、Nayyar Ahmad Aslam
DOI:10.1039/c4ra04293j
日期:——
Al0 for the allylation of a variety of prostereogenic α,α-disubstituted (hindered) cycloalkanones, 1,2-dione-based systems and various imino systems (CN functional groups) is reported. The stereoselective InCl3-catalyzed Al-based allylation of various 2-substituted-2-carbethoxycycloalkanones gave the corresponding products with moderate to excellent diastereoselectivity. The allylation and propargylation
Highly efficient asymmetric construction of novel indolines and tetrahydroquinoline derivatives <i>via</i> aza-Barbier/C–N coupling reaction
作者:Tao Guo、Bin-Hua Yuan、Wen-Jie Liu
DOI:10.1039/c7ob02891a
日期:——
Highly stereoselectivesyntheses of chiral indolines and tetrahydroquinolines are achieved by combining the asymmetric Zn-mediated allylation of chiral N-tert-butanesulfinyl imines with efficient intramolecular C–N cross-coupling. Herein, the advantages of such a synthetic strategy are illustrated by the synthesis of indolines and tetrahydroquinolines with quaternary stereocenters and multi-substituted
Asymmetric cinnamylation of N-tert-butanesulfinyl imines with cinnamyl acetates: total syntheses of (+)-lycoricidine and (+)-7-deoxypancratistatin
作者:Sen-Lin Cai、Bin-Hua Yuan、Yi-Xiang Jiang、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1039/c7cc00108h
日期:——
A highly diastereoselective palladium catalyzed cinnamylation of N-tert-butanesulfinyl imines with cinnamyl acetates has been established to provide enantioenriched [small beta]-aryl homoallylic amines. The synthetic application of this stragety has been successfully...
Dramatic lithium chloride effect on the reaction stereocontrol in Zn-mediated asymmetric cinnamylation: highly practical synthesis of β-aryl homoallylic amines
作者:Min Liu、An Shen、Xing-Wen Sun、Fei Deng、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1039/c0cc03230a
日期:——
An extremely mild and practical approach for the preparation of enantiomerically enriched beta-aryl substituted homoallylic amines bearing two adjacent stereogeniccenters was realized by room temperature zinc-mediated highlystereoselective cinnamylation of N-sulfinyl imines.