Synthesis of trichloromethylpyrimidines and trichloromethylpyrimido [4,5-d]pyrimidines from alkyl 2-(diaminomethylidene)-3-oxobutyrates and trichloroacetonitrile
作者:V. A. Voronkova、A. V. Komkov、V. A. Dorokhov
DOI:10.1007/s11172-010-0015-5
日期:2009.2
Heterocyclization of alkyl 2-(diaminomethylidene)-3-oxobutyrates with trichloroacetonitrile yields alkyl 4-mino-6-methyl-2-trichloromethylpyrimidine-5-carboxylates. The latter compounds react with aryl isocyanates to produce the corresponding pyrimidinylureas, which undergo cyclization to 3-aryl-5-methyl-7-trichloromethylpyrimido[4,5- d]pyrimidine-2,4(1H,3H)-diones under the action of MeONa in MeOH.
烷基2-(二氨基亚甲基)-3-氧代丁酸酯与三氯乙腈的异环化反应生成烷基4-氨基-6-甲基-2-三氯甲基嘧啶-5-羧酸酯。后者化合物与芳基异氰酸酯反应生成相应的嘧啶酰脲,这在MeONa和MeOH的作用下发生环化,生成3-芳基-5-甲基-7-三氯甲基嘧啶[4,5-d]嘧啶-2,4(1H,3H)-二酮。