N-Heterocyclic carbene-catalysed intermolecular Stetter reactions of acetaldehyde
作者:Sun Min Kim、Ming Yu Jin、Mi Jin Kim、Yan Cui、Young Sug Kim、Liqiu Zhang、Choong Eui Song、Do Hyun Ryu、Jung Woon Yang
DOI:10.1039/c0ob01178a
日期:——
A facile method for the intermolecular Stetter reaction of various Michael acceptors with acetaldehyde as a biomimetic acylanion source was realized using N-heterocyclic carbene catalysis. This catalytic system has also been applied to the enantioselective Stetter reaction and resulted in moderate to good enantioselectivities for the corresponding Stetter products.
Thiazolium-catalyzed intermolecular Stetter reaction of linear and cyclic alkyl α-diketones
作者:Olga Bortolini、Giancarlo Fantin、Marco Fogagnolo、Pier Paolo Giovannini、Alessandro Massi、Salvatore Pacifico
DOI:10.1039/c1ob06480k
日期:——
3-butandione (biacetyl) as an alternative surrogate of acetaldehyde. The disclosed procedure proved to be compatible with microwave dielectric heating for reaction time reduction and with the use of different linear α-diketones as acyl anion donors (e.g.3,4-hexanedione for propionyl anion additions). Moreover, the unprecedented umpolung reactivity of cyclic α-diketones in the atom economic nucleophilic