Synthesis of 10-(R-benzoyl)-2,4-dimethyl-6-(R-phenyl)-8,9-dihydropyrimido[5,4-e]pyrrolo[1,2-c]pyrimidine-1,3(2H,4H)-diones and 2,4-dimethyl-9,10-dihydro-6λ4-pyrimido[5,4-d]pyrrolo- [1,2-b][1,2,6]thiadiazine-1,3,6(2H,4H,8H)-trione
摘要:
6-Imino-1,3-dimethyl-5-(pyrrolidin-2-ylidene)-5,6-dihydropyrimidine-2,4(1H,3H)-dione reacted with substituted benzoyl chlorides in the presence of triethylamine to give the corresponding 10-(R-benzoyl)-2,4-dimethyl-6-(R-phenyl)-8,9-dihydropyrimido[5,4-e]pyrrolo[1,2-c]pyrimidine-1,3(2H,4H)-diones. Analogous reaction with thionyl chloride afforded 2,4-dimethyl-9,10-dihydro-6 lambda(4)-pyrimido[5,4-d]pyrrolo[1,2-b][1,2,6]-thiadiazine-1,3,6(2H,4H,8H)-trione.
Synthesis of 6-imino-5-tetrahydro-1H-2-pyrrolylidenhexahydro-2,4-pyrimidinediones as intermediates for the synthesis of C-azanucleosides
摘要:
The method for the synthesis of 6-imino-5-tetrahydro-1H-2-pyrrolylidenhexahydro-2,4-pyrimidinediones is described. It is shown that the reaction of phosphorus trichloride, 2-pyrrolidones and 6-aminopyrimidines brings to condensation producing 6-imino-5-tetrahydro-1H-2-pyrrolylidenhexahydro-2,4-pyrimidinediones as intermediates for the synthesis of C-azanucleosides. The reaction of 6-imino-1,3-dimethyl-5-tetrahydro-2-pyrrolylidenhexahydro-2,4-pyrimidinedione with benzoyl chloride produces 10-benzoyl-2, 4-dimethyl-6-phenyl-1,2,3,4,8,9-hexahydropyrimido[5,4-e]pyrrolo[1,2-c]pyrimidine-1,3-dione. A method for the selective reduction of the carbomethoxy group of methyl 5-(4-imino-1,3-dimethyl-2,6-dioxohexahydro-5-pyrimidinyliden)-2-pyrrolidine carboxylate by system NaBH(4)/1,4dioxane/CoCl(2)/PEG-400 is described. (C) 2009 Elsevier Ltd. All rights reserved.