Asymmetric direct α,β-functionalization of allenes with chiral phosphine ligands was successfully achieved with extremely high enantioselectivity via asymmetric carbopalladation to the racemic allenes. The same palladium-catalyzed alkylation of a chiral allene was executed with complete enantiospecificity. The stereochemistry of this reaction was determined and the mechanism of this asymmetric induction is proposed.
通过对外消旋
丙二烯的不对称碳
钯化,成功实现了手性
膦配体对
丙二烯的不对称直接α,β-官能化,具有极高的对映选择性。手性
丙二烯的相同
钯催化烷基化反应具有完全的对映专一性。确定了该反应的立体
化学并提出了这种不对称诱导的机制。