Bismuth(III) Oxychloride Procatalyst Based One-Pot Multicomponent Synthesis of β′-Acetamido-β-dicarbonyl Compounds with Special Reference to pref-β′-Acetamido-β-oxo Esters
ZrOCl<sub>2</sub>•8H<sub>2</sub>O-Catalyzed One-Pot Multicomponent Synthesis of β′-Acetamido-β-dicarbonyl Compounds with Special Reference to <i>pref</i>-Selective β′-Acetamido-β-ketoesters
作者:Rina Ghosh、Swarupananda Maiti、Sajal K. Maity、Soumik Roy
DOI:10.1080/00397910801997710
日期:2008.5.23
Abstract ZrOCl2 · 8H2O catalyzes the one-potsynthesis of β′-acetamido-β-dicarbonyl compounds in high yields from aldehyde, enolizable β-dicarbonylcompound, acetyl chloride, and acetonitrile in solvent as well as in solvent-free conditions. β′-Acetamido-β-ketoesters are formed in moderate to exclusive pref-diastereoselectivity.
Bismuth(III) Oxychloride Procatalyst Based One-Pot Multicomponent Synthesis of β′-Acetamido-β-dicarbonyl Compounds with Special Reference to <i>pref</i>-β′-Acetamido-β-oxo Esters
Bismuth(III) chloride generated in situ from the procatalyst bismuth(III) oxychloride and acetyl chloride efficiently catalyzes the one-pot synthesis of β′-acetamido-β-dicarbonyl compounds from aldehydes, enolizable β-diketones, or β-oxo esters and acetyl chloride in acetonitrile solution and under solvent-free conditions at room temperature; in the case of the β-oxo ester derived products, these are obtained with moderate to excellent diastereoselectivity in favor of the pref-isomer. X-ray crystallographic analysis of one pref-β′-acetamido-β-oxo ester exhibits C-H···O and N-H···O intermolecular interactions in the three-dimensional supramolecular assembly.