Origin of the asymmetric induction in metallosalen-catalyzed reactions of aldehydes
作者:Wojciech Chaładaj、Janusz Jurczak
DOI:10.1039/b910473a
日期:——
played by the structure of the diamine moiety of salen chromium complexes in determining the catalyst conformational equilibrium and, in consequence, the direction of asymmetricinduction in metallosalen-catalyzed reactions of aldehydes.
The enantioselective addition of allylstannanes and allylsilanes to alkyl glyoxylates of type 1, catalyzed by chiral (salen)Cr(III) complexes 3, has been studied. We have found that the reaction proceeded smoothly for low loading (1–2 mol %) of (1R,2R)-(salen)Cr(III)BF43a or (1R,2R)-(salen)Cr(III)ClO43c, and allyltributyltin under simple, undemanding conditions, affording (R)-2-hydroxypent-4-enoic