We have developed new chiral Schiff base catalysts for the enantioselective addition of diethylzinc reagents to aldehydes. The reaction of benzaldehyde with diethylzinc in the presence of 1 mol % of the chiral Schiff base catalyst proceeded to afford 1-phenyl-1-propanol in 96% enantiomeric excess (ee).
Organocatalytic Dearomative [4 + 2] Cycloadditions of Biomass-Derived 2,5-Dimethylfuran with <i>ortho</i>-Quinone Methides: Access to Multisubstituted Chromanes
The organocatalytic dearomative [4 + 2] cycloadditions of biomass-derived 2,5-dimethylfuran with ortho-quinone methides were developed, affording two different types of multisubstituted chromanes in high yields and excellent diastereoselectivities. The controllable synthesis of these two types of multisubstituted chromanes could be achieved by succinctly varying the reaction conditions.
Oxidation of Secondary Benzylic Alcohols to Ketones by Activated Carbon–Molecular Oxygen System
作者:Yuki Sano、Takanori Tanaka、Masahiko Hayashi
DOI:10.1246/cl.2007.1414
日期:2007.12.5
A variety of benzylic alcohols were oxidized to the corresponding carbonyl compounds selectively in the presence of activated carbon under molecular oxygen atmosphere. This process does not require...
在分子氧气氛下,在活性炭存在下,多种苯甲醇被选择性地氧化成相应的羰基化合物。这个过程不需要...
One-Pot Synthesis of 3,4-Disubstituted Coumarins under Catalysis of Mn3O4 Nanoparticles
作者:Huayin Sun、Yonghui Zhang、Fengfeng Guo、Yizhe Yan、Changfeng Wan、Zhenggen Zha、Zhiyong Wang
DOI:10.1002/ejoc.201101578
日期:2012.1
The one-potsynthesis of 3,4-disubstitutedcoumarins from substituted 2-(hydroxymethyl)phenols with β-keto esters catalyzed by Mn3O4nanoparticles was developed. A series of 3,4-disubstitutedcoumarin derivatives were obtained in good yields.