Microwave-Accelerated Coupling-Isomerization-Enamine Addition-Aldol Condensation Sequences to 1-Acetyl-2-amino-cyclohexa-1,3-dienes
作者:Thomas Müller、Oana Schramm (née Dediu)
DOI:10.1055/s-2006-947352
日期:2006.8
The microwave-accelerated consecutive reaction of electron deficient (hetero)aryl bromides 1, (hetero)aryl propargyl alcohols 2, and enamino carbonyl compounds 6 or 8 furnishes 1-acetyl-2-amino-cyclohexa-1,3-dienes 7 or 6-N,N-dimethyl carbamoyl-cyclohexenones 9, respectively, in good yields in the sense of a one-pot coupling-isomerization-enamine addition-aldol condensation sequence.
[reaction: see text] In the presence of a stoichiometric or catalytic amount of diethylzinc, a beta-aminocrotonamide undergoes sequential addition/isomerization reactions with 1-alkyne to produce, upon hydrolysis, an alpha-alkylidene beta-dicarbonyl compound in a highly stereoselective manner. The method complements the conventional Knoevenagel synthesis of this class of compounds as to the choice