The highly efficient directα-alkylation of unactivated amides has been accomplished using alcohols in the presence of the Ru-PNN catalyst (0.1 mol%) with a high turnover number. Using this approach, 2-oxindole was directly transformed into C3-alkylated 3-hydroxyindolin-2-one in one step without the use of any oxidant.
Transition-Metal-Free C–H Hydroxylation of Carbonyl Compounds
作者:Moreshwar B. Chaudhari、Yogesh Sutar、Shreyas Malpathak、Anirban Hazra、Boopathy Gnanaprakasam
DOI:10.1021/acs.orglett.7b01616
日期:2017.7.7
and reductant free α-C(sp3)–H hydroxylation of carbonyl compounds are reported. This method is promoted by commercially available inexpensive KO-t-Bu and atmospheric air as an oxidant at room temperature. This unified strategy is also very facile for hydroxylation of various carbonyl compound derivatives to obtain quaternary hydroxyl compounds in excellent yield. A preliminary mechanistic investigation