A distinct approach for the synthesis of 1,3,3-trisubstituted 4,5-dioxopyrrolidines and 1,3,4,5-tetrasubstituted 1,2,3,6-tetrahydropyrimidines has been discovered, in the form of a three-component reaction of nitroarenes, formaldehyde, and dialkyl acetylenedicarboxylates using indium in dilute aqueous HCl at room temperature. The molar ratios of these substrates are 1:1:4 and 2:1:4 for the preparation of dioxopyrrolidines and tetrahydropyrimidines, respectively. The reactions involve the reduction of nitro compounds to amines, which are simultaneously attacked by dialkyl acetylenedicarboxylates and formaldehyde. The products are formed in good to high yields.
Reaction of dialkyl 2-butynoate with aniline and formaldehyde: revision of the structure of the product
作者:A. Srikrishna、M. Sridharan、K.R. Prasad
DOI:10.1016/j.tet.2010.03.084
日期:2010.5
Dimethyl 3-(aryl)-3,6-dihydro-2H-1,3-oxazine-4,5-dicarboxylate structure assigned for the products obtained in the Bronsted acid catalyzed reaction of dimethyl but-2-ynoates with anilines and an excess of formaldehyde in methanol has been revised to methyl 1-(aryl)-3-(methoxymethyl)-4,5-dioxopyrrolidine-3-carboxylate.
3-(芳基)-3,6-二氢-2 H -1,3-恶嗪-4,5-二羧酸二甲酯结构被指定用于布朗斯台德酸催化的丁-2-酸二甲酯与苯胺和苯胺的反应中获得的产物甲醇中过量的甲醛已修改为1-(芳基)-3-(甲氧基甲基)-4,5-二氧杂吡咯烷-3-羧酸甲酯。