Scandium(III)-Catalyzed Enantioselective Allylation of Isatins Using Allylsilanes

The scandium(III)-catalyzed enantioselective Hosomi–Sakurai allylation of isatins with various substituted allylic silanes is described. A catalyst loading as low as 0.05 mol % is utilized at room temperature to afford the 3-allyl-3-hydroxy-2-oxindoles in excellent yields and enantioselectivity up to 99% ee, including a demonstration of a gram-scale reaction. The effects of additives and varying silyl groups were explored to demonstrate the scope and application.