A simple and efficient procedure was developed for the preparation of a variety of aryl, hetero aryl and alkyl N-sulfinylimines (2b-2u) with excellent yields (85–94%) using tungstophosphoric acid as catalyst. Also, this new synthetic protocol features high conversion, shorter reaction time, a straight forward and simple work up procedure. Catalyst was recycled for 10 times without much loss in activity
KHSO<sub>4</sub>-Mediated Condensation Reactions of <i>tert</i>-Butanesulfinamide with Aldehydes. Preparation of <i>tert</i>-Butanesulfinyl Aldimines
作者:Yong Qin、Zhiyan Huang、Min Zhang、Yin Wang
DOI:10.1055/s-2005-865234
日期:——
tert-butanesulfinyl aldimines 1 were prepared by direct condensation of chiral tert-butanesulfinamide 3 with aldehydes 2 in high yields in the presence of KHSO 4 . The main advantage of KHSO 4 is that it is applicable to the condensation reactions of a variety of aldehydes, including electron deficient and electron rich (hetereo)aromatic aldehydes, as well as aliphatic aldehydes.
Conversion of 1,3-disubstituted arenes to chiral α,α-diaryl methylammonium chlorides using arene borylation
作者:Timothy A. Boebel、John F. Hartwig
DOI:10.1016/j.tet.2008.04.060
日期:2008.7
A two-step conversion of 1,3-disubstituted arenes to chiral α,α-diaryl methylammonium chlorides is described. In this procedure, arenes are converted to aryl boronic esters by iridium-catalyzed borylation, and the aryl boronic esters are converted to enantioenriched amines by subsequent rhodium-catalyzed addition to chiral tert-butanesulfinimes.
Synthesis of Chiral Aziridines Through Decarboxylative Generation of Sulfur Ylides and Their Reaction with Chiral Sulfinyl Imines
作者:David C. Forbes、Sampada V. Bettigeri、Sejal R. Amin、Christie J. Bean、Amanda M. Law、Robert A. Stockman
DOI:10.1080/00397910802654898
日期:2009.6.9
Abstract Reaction of sulfurylides with a series of aryl substituted chiral nonracemic sulfinyl imines afforded the corresponding aziridines in good yields with good stereoselectivity. The sulfurylides were generated by the thermally induced decarboxylation of carboxymethylsulfonium betaines. A drop in the diastereomeric ratio was observed when going from electron-deficient to electron-releasing aryl
Synthesis of Sulfinimines by Direct Condensation of Sulfinamides with Aldehydes Using Cs<sub>2</sub>CO<sub>3</sub>as an Activating and Dehydrating Reagent
Chiral sulfinimines were prepared from chiral sulfinamides and aldehydes in CH 2 Cl 2 in the presence of cesium carbonate as an amine-activating and dehydrating reagent.