Simple Primary Anilines as Iminium Catalysts for the Epoxidation of α-Substituted Acroleins
作者:Anniina Erkkilä、Petri M. Pihko、Melanie-Rose Clarke
DOI:10.1002/adsc.200700048
日期:2007.4.2
Simple ortho-alkylated anilines have been shown to be excellent iminiumcatalysts for the epoxidation reaction of α-substitutedacroleins. A range of different α-substitutedacroleins give the epoxide products in good to excellent yields and good chemoselectivity.
Diazepane Carboxylates as Organocatalysts in the Diels-Alder Reaction of α-Substituted Enals
作者:Nicklas O. Häggman、Benjamin Zank、HyunJune Jun、Dainis Kaldre、James L. Gleason
DOI:10.1002/ejoc.201801009
日期:2018.10.24
Diazepane carboxylates efficiently catalyze the Diels–Alder cycloaddition of α‐substituted enals with a range of dienes. With chiral diazepane backbones, weak electrostatic interactions favour diene approach from the more hindered face, leading to enantioselectivities of 70–95 % with a range of dienophiles.
Catalytic enantioselective construction of all-carbon quaternary stereocenters by an organocatalytic Diels–Alder reaction of α-substituted α,β-unsaturated aldehydes
A binaphthyl-based primary amine (R)- was designed for the Diels-Alderreaction of alpha-substituted alpha,beta-unsaturated aldehydes; in the presence of the TfOH salt of (R)-, the Diels-Alderreaction of alpha-substituted alpha,beta-unsaturated aldehydes with cyclopentadiene proceeded to afford the corresponding cycloadducts having one all-carbon quaternary stereocenter in good yield with good to