Magnetic magnetite nanoparticals catalyzed selective oxidation of α-hydroxy ketones with air and one-pot synthesis of benzilic acid and phenytoin derivatives
A clean and efficient protocol for selective oxidation of α-hydroxy ketones using magnetic magnetite nanoparticals (Fe3O4·MNPs) as catalyst with air as green oxidant has been developed. Application of Fe3O4·MNPs was also proved to be successful in one-pot synthesis of benzilic acid and phenytoin derivatives. The facile one-pot procedure enhanced the production efficiency, shortened the reaction time
已开发出一种清洁有效的方案,以磁性磁铁矿纳米粒子(Fe 3 O 4 ·MNPs)为催化剂,以空气为绿色氧化剂,选择性氧化α-羟基酮。Fe 3 O 4 ·MNPs在单锅合成苯甲酸和苯妥英衍生物中也被证明是成功的。简便的一锅法提高了生产效率,缩短了反应时间,并最大程度地减少了化学废物。值得注意的是,该催化剂可以重复使用至少五次,而没有任何明显的活性损失。
Chemoselective and repetitive intermolecular cross-acyloin condensation reactions between a variety of aromatic and aliphatic aldehydes using a robust N-heterocyclic carbene catalyst
作者:Ming Yu Jin、Sun Min Kim、Hui Mao、Do Hyun Ryu、Choong Eui Song、Jung Woon Yang
DOI:10.1039/c3ob42486c
日期:——
We found that chemoselectivity of the crossed acyloin product is controlled by the adjustment of the aromatic aldehyde/aliphatic aldehyde ratio. Moreover, we observed the persistent catalytic activity of the homogeneous NHC catalyst in a solution due to NHC catalyst robustness.
The first method for highlyenantioselective Brønsted acid catalyzed Heyns rearrangement reactions, featuring low catalyst loadings, high yields, high enantioselectivities, good functional-group tolerance, and broad substrate scope has been developed. The method is efficient, delivering various chiral amines, including some biologically active molecules.