The tertiary amine-catalyzed directasymmetric aldol reaction of 2-hydroxyacetophenones (2-hydroxy-1-arylethanones) with a variety of aliphatic aldehydes has been demonstrated. By using 20 mol-% of unmodified cinchonine as catalyst, the direct aldol reaction products were isolated in good yields and with remarkably high syn diastereocontrol and good asymmetricinduction (40–78 % ee). This newly elaborated
Tandem Benzylic Oxidation/Dihydroxylation of<i>α</i>-Vinyl- and<i>α</i>-Alkenylbenzyl Alcohols
作者:Rodney A. Fernandes、Pullaiah Kattanguru
DOI:10.1002/hlca.201400143
日期:2015.1
A de novo tandembenzylicoxidativedihydroxylation of α‐vinyl‐ and α‐alkenylbenzyl alcohols has been developed to give α,β‐dihydroxypropiophenones (=2,3‐dihydroxy‐1‐phenylpropan‐1‐ones) and α,β‐dihydroxyalkyl phenones. This method was shown to be substrate‐selective and specific for the oxidation of benzylicalcohols.