Carbene-Catalyzed α-Carbon Amination of Chloroaldehydes for Enantioselective Access to Dihydroquinoxaline Derivatives
摘要:
An NHC-catalyzed alpha-carbon amination of chloroaldehydes was developed. Cyclohexadiene-1,2-diimines are used as amination reagents and four-atom synthons. Our reaction affords optically enriched dihydroquinoxalines that are core structures in natural products and synthetic bioactive molecules.
A highly enantioselective inverse electron demand hetero-Diels–Alder reaction of o-benzoquinone diimide and aldehydes has been developed by secondary amine catalysis, giving a facile protocol to access a variety of chiral hydroquinoxalines under mild conditions.
The three component reaction involving isocyanides, dimethyl acetylenedicarboxylate and quinoneimides: a facile synthesis of spirofused γ-iminolactams
作者:Vijay Nair、R. Dhanya、S. Viji
DOI:10.1016/j.tet.2005.04.008
日期:2005.6
The three component reaction of the zwitterion generated from dimethylacetylenedicarboxylate and isocyanides with various quinoneimides is described. The reaction afforded the corresponding γ-spiroiminolactams in good yields.
Lewis Acid Catalyzed Addition of Allylsilane to<i>o</i>-Quinonediimides: Formal Diels-Alder Reaction versus Allylation
作者:Vijay Nair、R. Dhanya、N. Vidya、S. Devipriya
DOI:10.1055/s-2005-918494
日期:——
Lewis acid promoted addition of allylsilane to o-quinonediimines afforded tetrahydroquinoxaline derivatives or allylated amides, depending on the nature of the substituent on the imine nitrogen.
Catalytic Asymmetric Dearomative Arylation of 2‐Naphthols Enabled by o‐Quinone Diimides
作者:Yuan‐Yang Li、Fu‐Yuan Yang、Meng‐Yuan Wu、Lihua Huang、Guang‐Jian Mei
DOI:10.1002/adsc.202400200
日期:2024.10.25
The catalytic asymmetric dearomative arylation of 2-naphthols enabled by the unconventional reactivity of o-quinone diimides, i. e. the 1,4-conjugate addition on quinone sp2 hybridized carbon, has been established. Under the catalysis of chiral phosphoric acid, various cyclohexaenones bearing an all-carbon quaternary stereocenter have been prepared with excellent yields and enantioselectivities.