Synthesis and biological activity of 3-acylmethylene-substituted 2-piperazinones
作者:A. V. Milyutin、N. V. Safonova、A. F. Goleneva、Yu. S. Andreichikov、G. A. Tul'bovich、R. R. Makhmudov
DOI:10.1007/bf02219407
日期:1994.12
out by reacting methyl esters of 3-R 1-4-R2-4-oxo-2-hydroxy-2 butenoic acid (I) with ethylenediamine (II) (method A). The reaction proceeds with yields of up to 94% in alcoholic medium in the presence of catalytic amounts of acetic acid. The simplest method for synthesizing methyl esters of I is the Claisen condensation [13]. We have found that yields as high as 76%, based on II, of final products are