Palladium and a simple chiral amine are used as co‐catalysts for the enantioselective conjugate addition of aryl boronic acids to α,β‐unsaturated aldehydes (see scheme). The synthetic utility of this co‐catalyzed reaction was demonstrated in the short total syntheses of (R)‐(−)‐curcumene and 4‐aryl‐2‐ones.
Intermolecular Enantioselective Heck–Matsuda Arylations of Acyclic Olefins: Application to the Synthesis of β-Aryl-γ-lactones and β-Aryl Aldehydes
作者:Caio C. Oliveira、Ricardo A. Angnes、Carlos Roque D. Correia
DOI:10.1021/jo400378g
日期:2013.5.3
intermolecular Heck–Matsuda arylation of acyclic allylicalcohols. Aryldiazonium tetrafluoroborates were applied as arylating agents in the presence of Pd(TFA)2 and a chiral, commercially available, bisoxazoline ligand. The methodology is straightforward, robust, scalable up to a few grams, and of broad scope allowing the synthesis of a range of β-aryl-carbonyl compounds in good to high enantioselectivities
Asymmetric Conjugate Addition of Organozinc Compounds to α,β-Unsaturated Aldehydes and Ketones with [2.2]Paracyclophaneketimine Ligands without Added Copper Salts
作者:Stefan Bräse、Sebastian Höfener
DOI:10.1002/anie.200501732
日期:2005.12.9
Catalytic Enantioselective β-Alkylation of α,β-Unsaturated Aldehydes by Combination of Transition-Metal- and Aminocatalysis: Total Synthesis of Bisabolane Sesquiterpenes
aldehydes by combination of simple chiral amine and copper catalysts provides β‐branched aldehydes in a one‐pot protocol (see scheme). The methodology was applied to the short total syntheses of bisabolanesesquiterpenes (S)‐(+)‐curcumene, (E)‐(S)‐(+)‐3‐dehydrocurcumene and (S)‐(+)‐tumerone.