S 98 Synthesis of podands with dihydropyrimidine fragments based on polyethers with terminal acetoacetamide groups [Electronic resource] / E. S. Radionava, O. V. Fedorova, Yu. A. Titova, G. L. Rusinov, V. N. Charushin // Chemistry of Heterocyclic Compounds. - 2015. - Vol. 51, № 5. - С. 478-482. - Bibliogr. : p. 482 (19 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ACETOACETAMIDE-CONTAINING PODANDS -- DIHYDROPYRIMIDINE-CONTAINING PODANDS -- ACETYLKETENE Аннотация: Reactions of aliphatic aminopodands having different length of the polyether chain with acetoacetic ester and 2,2,6-trimethyl-4H-1,3-dioxin-4-one were studied. The interaction of aminopodands with acetoacetic ester in toluene upon sonication (60A degrees D) or heating (90A degrees D) gave podands with terminal aminocrotonate fragments. The use of dioxinone at the same temperature allowed to transform aminopodands into aliphatic acetoacetamide-containing podands. An asymmetric podand with 2-pyridone fragment was isolated as byproduct from the reaction of dioxinone with 1,5-diamino-3-oxapentane. A three-component Biginelli reaction of acetoacetamidecontaining podands with benzaldehyde and urea in the presence of catalytic amounts of polyphosphoric acid immobilized on nanosized TiO2-SiO2 oxide surface enabled the synthesis of podands with 1,4-dihydropyrimidin-2-(1De)-one fragments. \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\2015, v.51, N 5, p. 478-482.pdf |