An efficient enantioselective alkylation of N‐unprotected 3‐substitutedoxindoles was realized by using a chiral N,N′‐dioxide/scandium(III) complex as the catalyst. A wide range of 3,3‐dialkyl substitutedoxindoles with quaternary stereocenters were obtained in high yields and ee values (up to 98% yield and 99% ee).
Reactions of propargylic halides with trifluoromethyltrimethylsilane in the presence of a catalytic amount of copper(I) thiophene-2-carboxylate (CuTC) have been found to give the corresponding trifluoromethylated products in good to high yields with a high selectivity.
Hot couple: Propargyl azides were coupled with carboxylic acids by an iron‐catalyzed dehydrogenativeCObondformation (see scheme). This method enables propargylicCHfunctionalization under mild reaction conditions and also may involve the application of the azido moiety as an assisting group in CH activation.