Synthesis of Functionalized Indoles with a Trifluoromethyl-Substituted Stereogenic Tertiary Carbon Atom Through an Enantioselective Friedel-Crafts Alkylation with β-Trifluoromethyl-α,β-enones
作者:Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1002/chem.201000568
日期:——
tert‐butoxide catalyze the Friedel–Crafts alkylation reaction of indoles with β‐trifluoromethyl‐α,β‐unsaturated ketones to give functionalizedindoles with an asymmetric tertiary carboncenter attached to a trifluoromethyl group. The reaction can be applied to a large number of substituted α‐trifluoromethyl enones and substituted indoles. The expected products were obtained with good yields and ees of
catalyzed by chiral bifunctional squaramide-tertiary amine catalysts, affording a wide spectrum of 3,2′-pyrrolidinyl spirooxindoles. The significance of this protocol is highlighted by its extremely high efficiency in the construction of the structurally diverse spirocyclic oxindoles, bearing a vicinally bis(trifluoromethyl)-substituted pyrrolidine moiety, including four contiguous stereocenters, in high
N -2,2,2-三氟乙基异丁酮酮与β-三氟甲基烯酮,3-三氟亚乙基ethyl吲哚和3-三氟亚乙基苯并呋喃酮可以通过不对称的[3 + 2]环加成反应,由手性双官能方酰胺-叔胺催化剂催化,提供宽谱图3,2'-吡咯烷基螺氧辛酯。该协议的重要性在于其结构多样性高的螺环羟吲哚的高效率突出,该环带有高毒度的立体声控制的含双(三氟甲基)取代的吡咯烷部分的邻位双(三氟甲基)取代的吡咯烷部分。
Rh(III)-Catalyzed [3 + 2] Annulation via C–H Activation: Direct Access to Trifluoromethyl-Substituted Indenamines and Aminoindanes
The rhodium(III)-catalyzeddirectC–H addition and annulation of benzimidates and aldimines with β-(trifluoromethyl)-α,β-unsaturated ketones is described. This protocol provides the facile and efficient formation of various trifluoromethyl-containing indenamines or aminoindanes in moderate to high yields.
practical phosphine‐catalyzed vicinal difunctionalization of β‐fluoroalkyl α,β‐enones with TMSN3 has been developed. Using dppb as the catalyst, the reaction worked efficiently to yield various β‐amino α‐diazocarbonyl compounds in high yields (up to 94 %). This work marks the first efficient construction of α‐diazocarbonyl compounds by phosphine catalysis. Meanwhile, the asymmetric variant induced by the