A Ruthenium Catalyst with Unprecedented Effectiveness for the Coupling Cyclization of γ-Amino Alcohols and Secondary Alcohols

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• 作者：Bing Pan ; Bo Liu ; Erlin Yue ; Qingbin Liu ; Xinzheng Yang ; Zheng Wang ; Wen-Hua Sun
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：February 5, 2016
• 年：2016
• 卷：6
• 期：2
• 页码：1247-1253
• 全文大小：447K
• ISSN：2155-5435

文摘

The ruthenium complex (8-(2-diphenylphosphinoethyl)aminotrihydroquinolinyl)(carbonyl)(hydrido)ruthenium chloride exhibited extremely high efficiency toward the coupling cyclization of γ-amino alcohols with secondary alcohols. The corresponding products, pyridine or quinoline derivatives, are obtained in good to high isolated yields. On comparison with literature catalysts whose noble-metal loading with respect to γ-amino alcohols reached 0.5–1.0 mol % for Ru and a record lowest of 0.04 mol % for Ir, the current catalyst achieves the same efficiency with a loading of 0.025 mol % for Ru. The mechanism of acceptorless dehydrogenative condensation (ADC) was proposed on the basis of DFT calculations; in addition, the reactive intermediates were determined by GC-MS, NMR, and single-crystal X-ray diffraction. The catalytic process is potentially suitable for industrial applications.