Enantio- and Regioselective Conjugate Addition of Organometallic Reagents to Linear Polyconjugated Nitroolefins
作者:Matthieu Tissot、Alexandre Alexakis
DOI:10.1002/chem.201300538
日期:2013.8.19
The copper‐catalysed conjugate addition of trialkylaluminium and dialkylzinc reagents to polyconjugated nitroolefins (nitrodiene and nitroenyne derivatives) is reported. A reversed Josiphos ligand L7 allows for the selective 1,4‐ or 1,6‐addition with high enantioselectivities.
Au‐rganocatalytic reaction: A one‐pot process consisting of a Michaeladdition to a nitroenyne and a subsequent acetalization/cyclization is reported (see scheme; TMS=trimethylsilyl), which results in the formation of nitro‐substituted tetrahydrofuranyl ethers with high diastereo‐ and enantioselectivities. Organocatalysis and gold catalysis are compatible and complementary in a one‐pot process.
Enantioselective Friedel–Crafts reaction of hydroxyarenes with nitroenynes to access chiral heterocycles <i>via</i> sequential catalysis
作者:Marc Montesinos-Magraner、Carles Lluna-Galán、Francisco Cernicharo-Toledo、Carlos Vila、Gonzalo Blay、José R. Pedro
DOI:10.1039/d1ob01238j
日期:——
Naphthols, hydroxyindoles and an activated phenol are reacted with differently substituted (E)-nitrobut-1-en-3-ynes using the commercially available Rawal's chiral squaramide.