Aromatic aldehydes react in one pot at room temperature with enolizable ketones and acetonitrile in the presence of acetyl chloride and catalytic amount of BiOCl producing the corresponding β-acetamido ketones in very high to excellent yields. BiCl3 generated in situ from BiOCl and acetyl chloride catalyzes the multicomponent reaction.
ZrOCl2·8H2O: an efficient Lewis acid catalyst for the one-pot multicomponent synthesis of β-acetamido ketones
作者:Rina Ghosh、Swarupananda Maiti、Arijit Chakraborty、Santu Chakraborty、Alok K. Mukherjee
DOI:10.1016/j.tet.2006.02.037
日期:2006.4
Aromatic aldehydes were reacted in one-pot with enolisable ketones, acetonitrile and acetyl chloride at ambient temperature in the presence of ZrOCl2·8H2O to furnish the corresponding β-acetamidoketones in very good to excellent yields. X-ray crystallographic analysis of one anti-β-acetamido ketone exhibited a two-dimensional supramolecular framework by a combination of N–H⋯O, C–H⋯O and C–H⋯π (arene)
A modified Dakin‐West one‐pot, four‐component condensation of an aryl aldehyde, aryl ketone, acetyl chloride and acetonitrile in the presence of silicasupportedperchloricacid as an active, inexpensive, recoverable and recyclable catalyst is reported for the synthesis of β‐acetamido ketones under mechanical stirring and ultrasonic irradiation conditions. This system has advantages of short reaction
Iodineefficiently catalyzes the three-component coupling of aromaticaldehydes, enolizable ketones or keto esters, and acetonitrile in the presence of acetyl chloride to afford β-acetamido ketones in good yields at room temperature.
CeCl3·7H2O: an efficient and reusable catalyst for the preparation of β-acetamido carbonyl compounds by multi-component reactions (MCRs)
作者:Abu T. Khan、Lokman H. Choudhury、Tasneem Parvin、Md. Asif Ali
DOI:10.1016/j.tetlet.2006.09.041
日期:2006.11
A convenientmethod for the preparation of β-acetamido carbonyl compounds is described by multi-component reactions of aromatic aldehydes, enolizable ketones or β-keto esters and acetonitrile in the presence of acetyl chloride and 10 mol % CeCl3·7H2O at room temperature.