Enantioselective [4+2] Cycloaddition of Buta‐1,3‐dienes to Alkyl Glyoxylates Catalyzed by the Chiral (Salen)Chromium(III) Complex

Abstract

Abstract Thermal and high‐pressure [4+2] cycloadditions of buta‐1,3‐diene ( 3 ), cyclohexa‐1,3‐diene ( 5 ), and 2,3‐dimethylbuta‐1,3‐diene ( 6 ) to alkyl glyoxylates of type 2 ( R n ‐Bu, i ‐Pr, t ‐Bu), catalyzed by chromium complex (R,R)‐ 1 , leading to the corresponding cycloadducts 4, 7 and 8 with relatively high enantioselectivity, are described.