Metal Amidoboranes: Superior Double-Hydrogen-Transfer Agents in the Reduction of Ketones and Imines
作者:Weiliang Xu、Guotao Wu、Wei Yao、Hongjun Fan、Jishan Wu、Ping Chen
DOI:10.1002/chem.201201301
日期:2012.10.22
Metal amidoboranes (MABs), such as lithium amidoborane (LiAB), show superior ability in reducing ketones and imines directly into their corresponding secondary alcohols and amines, respectively, at room temperature with high conversion and yields. A mechanistic study indicates that the reduction proceeds through a double‐hydrogen‐transfer process. Both protic H(N) and hydridic H(B) protons in the amidoborane
金属酰氨基硼烷(MAB),例如酰氨基硼烷(LiAB),在室温下显示出优异的将酮和亚胺分别直接还原为相应的仲醇和胺的能力,并且转化率和收率很高。一项机理研究表明,还原过程是通过双氢转移过程进行的。酰胺基硼烷中的质子H(N)和氢H(B)质子均参与反应。理论研究表明,还原反应的第一步(以及确定速率的步骤)是从LiAB中消除LiH,然后将H(Li)转移至不饱和键的C位。