A Convenient Synthesis of N1-Substituted 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones by Cyclocondensation of α-Chlorobenzyl Isocyanates with Ethyl <i>N</i>-alkyl(aryl)-β-aminocrotonates
A new convenient approach to the synthesis of N1-sub-stituted 3,4-dihydropyrimidin-2(1H)-ones was developed using the regioselective cyclocondensation of α-chlorobenzyl isocyanates with ethyl N-alkyl(aryl)-β-aminocrotonates. A number of Nl-aryl and N1-alkyl substituted Biginelli compounds difficult to obtain by other methods were prepared with high yields.