作者:N. A. Keiko、E. A. Verochkina、L. I. Larina
DOI:10.1134/s1070428011120025
日期:2011.12
Reactions of 2-ethoxyprop-2-enal with cycloaliphatic secondary amines (morpholine, piperidine, pyrrolidine) follow 1,4- or 1,2-addition pattern with subsequent condensation of the adduct with the initial amine to produce isomeric 2-ethoxyprop-2-ene-1,1-diamines and 2-ethoxyprop-1-ene-1,3-diamines. These reactions are accelerated by a factor of 15-30 under microwave irradiation and in the presence of water. The regioselectivity of primary nucleophilic attack varies over a wide range, depending on the amine basicity and reactant ratio. The reaction of 2-ethoxyprop-2-enal with pyrrolidine and water at a ratio of 1 : 10 : 10 was characterized by increased regioselectivity of 1,4-addition (up to 75%). Unlike cycloaliphatic amines, 2-ethoxyprop-2-enal reacted with N-methylaniline under microwave irradiation at a lower rate to give 2-ethoxy-N-1,N-1,N-3-trimethyl-N-1,N-1,N-3-triphenylpropane-1,1,3-triamine.