Highly pH-Dependent Chemoselective Transfer Hydrogenation of α,β-Unsaturated Aldehydes in Water
作者:Nianhua Luo、Jianhua Liao、Lu Ouyang、Huiling Wen、Jitian Liu、Weiping Tang、Renshi Luo
DOI:10.1021/acs.organomet.9b00353
日期:2019.8.12
electron-poor substituents on the aryl group of α,β-unsaturated aldehydes can be tolerated, affording the corresponding products in excellent yields with high TOF values. High selectivity and yields were also observed for α,β-unsaturated aldehydes with aliphatic substituents. Our mechanistic investigations indicate that the pH value is critical to the chemoselectivity.
在水中实现了pH依赖的选择性Ir催化的α,β-不饱和醛的加氢反应。在低pH下使用HCOOH作为氢化物供体,仅获得不饱和醇产物,而在高pH下,优先使用HCOONa作为氢化物供体形成饱和醇产物。可以耐受包括α,β-不饱和醛的芳基上的富电子以及贫电子取代基在内的各种官能团,从而以高收率提供具有高收率的相应产物。还观察到具有脂族取代基的α,β-不饱和醛的高选择性和产率。我们的机理研究表明,pH值对化学选择性至关重要。