Studies on the Mechanism of B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Hydrostannylation of Propargylic Alcohol Derivatives
作者:Martins S. Oderinde、Michael G. Organ
DOI:10.1002/anie.201204060
日期:2012.9.24
Sleight of hydride: B(C6F5)3 catalyzes the hydrostannylation of propargylicalcohols in a regio‐ and stereoselective manner (see scheme). This Lewis acid first abstracts a hydride from the stannane, thus forming a borohydride/stannyl cation pair, the stability of which depends on solvent and ligands. Deuterium‐labeling experiments showed that the source that delivers a hydride to the alkenyl cation
氢化物的轻度:B(C 6 F 5)3以区域和立体选择性的方式催化炔丙醇的加氢甲锡化反应(参见方案)。该路易斯酸首先从锡烷中提取氢化物,从而形成硼氢化物/锡烷基阳离子对,其稳定性取决于溶剂和配体。氘标记实验表明,将氢化物传递至烯基阳离子的来源不是硼氢化物,而是锡烷的第二分子。
Pronounced Solvent Effect on the Hydrostannylation of Propargylic Alcohol Derivatives with<i>n</i>Bu<sub>3</sub>SnH/Et<sub>3</sub>B at Room Temperature
作者:Martins S. Oderinde、Michael G. Organ
DOI:10.1002/chem.201203405
日期:2013.2.18
The solvent is key: A general protocol is described for the hydrostannylation of propargyl alcoholderivatives at roomtemperature using Et3B/O2 as the promoter (see scheme). Rate and mechanistic studies point to a different autoxidation product of Et3B in THF than is observed in benzene, the typical solvent.
溶剂是关键:描述了在室温下使用Et 3 B / O 2作为促进剂进行炔丙醇衍生物加氢苯乙烯化的通用方案(请参见方案)。速率和机理研究表明,Et 3 B在THF中的自氧化产物与在典型溶剂苯中观察到的不同。