77656-07-6Relevant academic research and scientific papers
Onium Salt-catalyzed Acylations with Diketene
Dehmlow, Eckehard V.,Shamout, Abdul Rahman
, p. 2062 - 2067 (2007/10/02)
Weak NH- and CH-acids can be acylated advantageously by diketene (1) in the presence of a quarternary ammonium chloride.Carboxamides yield with one or two moles of 1 the products 3 or 10 selectively. β-Keto esters and β-diketones lead to 12a, b or 13, respectively, and acetoacetamides give 5 or 8.The polymer 16 and/or 17 is formed by self-condensation of 1.
1,3-Oxazines and Related Compounds. V. N-Acylacetylation of Carboxamides with the Diketene-Halotrimethylsilane System or Acyl Meldrum's Acids
Yamamoto, Yutaka,Ohnishi, Shuhei,Azuma, Yutaka
, p. 3505 - 3512 (2007/10/02)
Various aliphatic and aromatic carboxamides smoothly underwent N-acetoacetylation by means of the diketene-iodotrimethylsilane system to give the corresponding N-acetoacetyl derivatives.The diketene-bromotrimethylsilane system was found to be very efficient for N-acetoacetylation of unsaturated carboxamides such as acrylamide and methacrylamide.In addition, acyl Meldrum's acids proved effective for N-acylacetylation of carboxamides, especially heterocyclic carboxamides such as picolinamides.Keywords: carboxamide; acylacetylation; diketene; iodotrimethylsilane; bromotrimethylsilane; acyl Meldrum's acid
