作者:P. Veeraraghavan Ramachandran、Abdulkhaliq A. Alawaed、Henry J. Hamann
DOI:10.1021/acs.joc.2c01744
日期:2022.10.7
Investigation of a variety of Lewis acids for the hydroboration-hydrolysis (reduction) of ketones with amine-boranes has revealed that catalytic (10 mol %) titanium tetrachloride (TiCl4) in diethyl ether at room temperature immensely accelerates the reaction of ammonia borane. The product alcohols are produced in good to excellent yields within 30 min, even with ketones which typically requires 24
对多种路易斯酸与胺硼烷进行硼氢化水解(还原)的研究表明,室温下在乙醚中的催化(10 mol%)四氯化钛(TiCl 4 )极大地加速了氨硼烷的反应。即使是在非催化条件下通常需要 24 小时或更长时间才能还原的酮,产品醇也可以在 30 分钟内以良好至极好的收率生产。几种潜在的反应性官能团是可以容忍的,并且取代的环烷酮被非对映选择性地还原为热力学产物。对反应进行了氘标记研究和11 B NMR 分析,以验证所提出的硼氢化机理。