Base-Promoted Tandem Cyclization for the Synthesis of Benzonitriles by C−C Bond Construction
作者:Cheng-Zhi Zhu、Yin Wei、Min Shi
DOI:10.1002/adsc.201701329
日期:2018.2.15
A facile synthesis of benzonitriles via a base‐promoted tandem cyclization reaction of α,β‐unsaturated enones having electron‐withdrawing group (EWG) and 2‐acyl‐acrylonitriles was developed. This new synthetic method to access benzonitriles is suitable for a wide range of substrates. A plausible reaction mechanism is proposed on the basis of previous literature and our own investigations.
Enantioselective Zinc-Mediated Conjugate Addition of Terminal Alkynes to Enones
作者:Gonzalo Blay、Luz Cardona、José R. Pedro、Amparo Sanz-Marco
DOI:10.1002/chem.201201765
日期:2012.10.8
Zinc for conjugate alkynylation: The enantioselectiveconjugateaddition of terminalalkynes to 2‐arylidene‐1,3‐diketones in the presence of diethylzinc and a catalytic amount of (R)‐VANOL has been developed. The reaction can be applied to different aromatic and heteroaromatic alkynes and enones, giving the expected products in good yield and with enantiomeric excesses up to 91 %. The products can
A new formal [1 + 2 + 3] annulation of o-alkenyl arylisocyanides with α, β-unsaturatedketones under metal-, base-, and acid-free conditions is disclosed. This domino reaction provides a general protocol for the efficient and practical synthesis of a wide range of carbazole derivatives from readily available starting materials in a single operation. Furthermore, this methodology was used as the key
Asymmetric Retro-Claisen Reaction Catalyzed by Chiral Aza-Bisoxazoline–Zn(II) Complex: Enantioselective Synthesis of α-Arylated Ketones
作者:Jia-Hui Liu、Xue-Jiao Lv、Yan-Kai Liu
DOI:10.1021/acs.orglett.3c00372
日期:2023.3.17
been developed under the catalysis of a chiral aza-bisoxazoline–Zn(II) complex. The reaction proceeds via a sequence of conjugate addition, arylation, hemiketal anion-initiated C–C bond cleavage, and enantioselective protonation of enolate to provide various functionalized α-arylated ketones bearing a tertiary stereogenic center with high enantioselectivities. Notably, biologically important benzofuran