Transition-State Charge Stabilization through Multiple Non-covalent Interactions in the Guanidinium-Catalyzed Enantioselective Claisen Rearrangement
作者:Christopher Uyeda、Eric N. Jacobsen
DOI:10.1021/ja110842s
日期:2011.4.6
mechanism by which chiral arylpyrrole-substituted guanidinium ions promote the Claisenrearrangement of O-allyl α-ketoesters and induce enantioselectivity was investigated by experimental and computational methods. In addition to stabilization of the developing negative charge on the oxallyl fragment of the rearrangement transition state by hydrogen-bond donation, evidence was obtained for a secondary