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.
Abstract A solvent-free, versatile procedure has been developed for the effective synthesis of tert-butanesulfinylimines of a variety of aldehydes using chiral tert-butanesulfinamides under green, sonochemical conditions. This method utilizes silica supported p-toluenesulfonic acid (pTSA·SiO2) as an efficient, safer and inexpensive catalystunder aerobic conditions. The practicable simplicity, easy
Microwave-Assisted Solvent-Free Synthesis of Enantiomerically Pure <i>N</i>-(<i>tert</i>-Butylsulfinyl)imines
作者:Juan F. Collados、Estefanía Toledano、David Guijarro、Miguel Yus
DOI:10.1021/jo300919x
日期:2012.7.6
environmentally friendly, and very efficient procedure for the synthesis of opticallypureN-(tert-butylsulfinyl)imines has been developed with microwave-promoted condensation of aldehydes and ketones using (R)-2-methylpropane-2-sulfinamide in the presence of Ti(OEt)4, under solvent-free conditions. This procedure allows for the preparation of a variety of sulfinyl aldimines with excellent yields and purities
Modular Stereocontrolled Assembly of R<sub>2</sub>Zn, Cyclic Enones and <i>N</i>-<i>tert</i>-Butanesulfinyl Imines
作者:José C. González-Gómez、Francisco Foubelo、Miguel Yus
DOI:10.1021/jo802812w
日期:2009.3.20
The assembly of a wide range of dialkylzincs, cyclic enones, and chiral N-tert-butylsulfinyl imines in the presence of the appropriate phosphoramidite ligands allowed the formation of β-amino ketones with three consecutive stereogenic centers in a stereocontrolled manner. The Baeyer−Villiger oxidation of the resulting aminoketones led to the corresponding aminolactones with excellent regio- and stereoselectivities
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