Silyloxy Amino Alcohol Organocatalyst for Enantioselective 1,3‐Dipolar Cycloaddition of Nitrones to α,β‐Unsaturated Aldehydes

Abstract

Abstract The catalytic activity of a simple amino alcohol that contains a bulky super silyl group [i.e., tris(trimethylsilyl)silyl (TTMSS)] bonded to the oxygen atom at the γ‐position along with a primary amine moiety was examined in the enantioselective 1,3‐dipolar cycloaddition of nitrones to α,β‐unsaturated aldehydes. The organocatalyst successfully provided optically active isoxazolidines in good chemical yields (up to 86 %) with excellent diastereoselectivities ( endo / exo , up to 96:4) and enantioselectivities (up to 97 % ee ). Furthermore, the obtained isoxazolidines were easily converted into γ‐amino diols that contain three contiguous stereogenic centers.