Copper Reactivity Can Be Tuned to Catalyze the Stereoselective Synthesis of 2-Deoxyglycosides from Glycals
作者:Carlos Palo-Nieto、Abhijit Sau、Robin Jeanneret、Pierre-Adrien Payard、Aude Salamé、Maristela Braga Martins-Teixeira、Ivone Carvalho、Laurence Grimaud、M. Carmen Galan
DOI:10.1021/acs.orglett.9b04525
日期:2020.3.6
We demonstrate that tuning the reactivity of Cu by the choice of oxidation state and counterion leads to the activation of both "armed" and "disarmed" type glycals toward direct glycosylation leading to the α-stereoselective synthesis of deoxyglycosides in good to excellent yields. Mechanistic studies show that CuI is essential for effective catalysis and stereocontrol and that the reaction proceeds
我们证明,通过选择氧化态和抗衡离子来调节Cu的反应性会导致“武装”和“解除武装”型糖类朝着直接糖基化的活化,从而导致以良好的优良收率合成脱氧糖苷的α-立体选择性合成。机理研究表明,CuI对于有效催化和立体控制至关重要,并且该反应通过烯醇醚和OH亲核试剂的双重活化而进行。