The synthesis of chiral α,β-unsaturated and aryl oxazolines from ketones and arols via their triflates and pd-catalyzed CO and amino alcohol coupling
作者:A.I. Meyers、Albert J. Robichaud、Marc J. McKennon
DOI:10.1016/s0040-4039(00)91890-2
日期:1992.2
An efficient route to the title compounds was achieved using the triflates of ketones and phenols followed by Pd-catalyzed CO insertion in the presence of chiral aminoalcohols. Aryl, vinyl bromides and 2-pyridone also served as useful substrates.
Hammett Studies of Enantiocontrol by PHOX Ligands in Pd-Catalyzed Allylic Substitution Reactions
作者:Ryan N. Constantine、Naomi Kim、Richard C. Bunt
DOI:10.1021/ol034610q
日期:2003.6.1
Electronically modified PHOX ligands 3a-e were synthesized to probe the mechanism of the enantioselective palladium-catalyzed allylicalkylation and amination reactions. Alkylation with dimethyl sodiomalonate produced only a small variation in the ee (89.3% to 93.4%), but amination with benzylamine gave a much wider variation in the ee (16.4% to 66.6%). Hammett analysis suggests that the substituents
<i>C</i>
‐Propargylation Overrides
<i>O</i>
‐Propargylation in Reactions of Propargyl Chloride with Primary Alcohols: Rhodium‐Catalyzed Transfer Hydrogenation
作者:Tao Liang、Sang Kook Woo、Michael J. Krische
DOI:10.1002/anie.201603575
日期:2016.8
The canonical SN2 behavior displayed by alcohols and activated alkyl halides in basic media (O‐alkylation) is superseded by a pathway leading to carbinol C‐alkylation under the conditions of rhodium‐catalyzed transfer hydrogenation. Racemic and asymmetric propargylations are described.
在铑催化的转移加氢条件下,醇和活化的烷基卤化物在碱性介质(O-烷基化)中表现出的标准S N 2行为被导致甲醇C-烷基化的途径所取代。描述了外消旋和不对称的炔丙基化。
Kinetic resolution of vic-amino alcohols catalyzed by a chiral Cu(II) complex
Kineticresolution of N-benzoylated vic-amino alcohols was achieved by benzoylation in the presence of copper triflate and (R,R)-Ph-BOX as catalysts. The observed enantioselectivity was moderate to high. The method was applied to a kineticresolution of racemic prolinol and piperidinemethanol derivatives as well as an asymmetric desymmetrization of 2-amino-1,3-diol derivatives.