Cyclometalated (NNC)Ru(<scp>ii</scp>) complex catalyzed β-methylation of alcohols using methanol
作者:Kasturi Ganguli、Natalia V. Belkova、Sabuj Kundu
DOI:10.1039/d1dt03967a
日期:——
this strategy, a wide range of primary, secondary, and aliphatic straight chain alcohols were selectively methylated. This protocol was further employed for the methylation of a few natural products and the gram scale synthesis of β-methylated alcohols. A series of control experiments and kinetic studies were performed to understand the plausible reaction mechanism.
合成了含有基于菲咯啉的新配体及其相应的Ru( II )配合物的吲哚基片段,并通过各种光谱技术对其进行了充分表征。研究了这些新合成的环金属化 (NNC)Ru( II ) 配合物对使用甲醇对醇进行 β-甲基化的催化活性。值得注意的是,这些配合物与各种 (NNN)Ru( II) 配合物。利用这种策略,多种伯醇、仲醇和脂肪族直链醇被选择性甲基化。该协议进一步用于一些天然产物的甲基化和 β-甲基化醇的克级合成。进行了一系列对照实验和动力学研究,以了解合理的反应机制。
PROCESS FOR PREPARATING OPTICALLY ACTIVE COMPOUNDS
申请人:Japan Science and Technology Corporation
公开号:EP0916637A1
公开(公告)日:1999-05-19
The present invention relates to a novel, highly practical method for producing optically active compounds such as optically active alcohol and optically active amine useful for various utilities such as synthetic intermediates of drugs, liquid crystal materials, and optical resolution agents, comprising hydrogen transfer-type asymmetric reduction in the presence of a transition metal catalyst and an optically active nitrogen-containing compound or a transition metal catalyst with an optically active nitrogen-containing compound as the asymmetric ligand, and a hydrogen-donating organic or inorganic compound.
In accordance with the present invention, characteristically, an optically active secondary alcohol can be recovered through the hydrogen transfer-type oxidation from racemic secondary alcohol or meso-type diol.