Pd-Catalyzed Carbonylative Conjugate Addition of Dialkylzinc Reagents to Unsaturated Carbonyls
作者:Daniel W. Custar、Hai Le、James P. Morken
DOI:10.1021/ol1013476
日期:2010.9.3
The Pd-catalyzed addition of organozinc reagents to unsaturated carbonyls in the presence of carbon monoxide provides 1,4-diketones in good yield. The reaction was studied with a number of substituted cyclic and acyclic ketones as well as α,β-unsaturated aldehydes.
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
Pyrrole derivatives are disclosed as agents for the treatment and prevention of neuropathies and neurodegenerative diseases characterized by the presence of axonal blockages, impaired axonal transport or impaired trafficking of vesicles in neurons.
Novel pyrrole derivatives are disclosed as Aβ
42
-lowering agents for the treatment and prevention of neurodegenerative disorders characterized by the formation or accumulation of amyloid plaques comprising the Aβ
42
peptide.
Novel pyrrole derivatives are disclosed as Aβ
42
-lowering agents for the treatment and prevention of neurodegenerative disorders characterized by the formation or accumulation of amyloid plaques comprising the Aβ
42
peptide.