有機合成化学協会誌
Online ISSN : 1883-6526
Print ISSN : 0037-9980
ISSN-L : 0037-9980
総説および総合論文
反応を選択的に促進する固体触媒の開発と連続フロー反応への展開
山田 強朴 貴煥佐治木 弘尚
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ジャーナル 認証あり

2021 年 79 巻 5 号 p. 472-482

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The development of “selective” reaction catalysts has considerable research interest in synthesizing fine chemicals and bioactive compounds. We have developed four types of solid-state heterogeneous palladium catalysts immobilized on cellulose particles (CLP), monolithic cellulose (CLM), and monolithic silica particles (SM), 5% Pd/CLP, 5% Pd/CLM, 5% Pd/SM, and 0.25% Pd/SM(sc) [sc: supercritical], for chemoselective hydrogenation under batch and continuous-flow reaction conditions. These four catalysts indicate novel chemoselectivity toward hydrogenations based on the structure of supports and immobilization methods, even using the same techniques or materials. 5% Pd/CLM, 5% Pd/SM, and 0.25% Pd/SM(sc)-packed catalyst cartridges for continuous-flow hydrogenation were also developed as efficiently utilizing the monolithic structure of the solid-state catalysts. The continuous-flow system using such catalysts could achieve high productivities of the hydrogenated products. Furthermore, the tertiary amine-functionalized basic anion exchange resin WA30, as a solid-state organocatalyst, catalyzed synthesis of site-selectively deuterium-labeled β-nitroalcohols have been developed under both batch and continuous-flow conditions. The WA30-catalyzed deuteration of nitromethane in deuterium oxide and the subsequent nitroaldol reaction proceeded to provide the bis-deuterium-labeled β-nitroalcohols in high yields and high deuterium contents. The WA30-packed catalyst cartridge can be applied in continuous synthesis for at least 72 h without degradation of the catalyst activity.

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