Kolesova, M. B.; Muravich-Aleksandr, Kh. L.; Smirnova, N. V., Journal of Organic Chemistry USSR (English Translation), 1981, vol. 17, p. 954 - 960
作者:Kolesova, M. B.、Muravich-Aleksandr, Kh. L.、Smirnova, N. V.、Girshovich, M. Z.
DOI:——
日期:——
KOLESOVA M. B.; MURAVICH-ALEKSANDR X. L.; SMIRNOVA N. V.; GIRSHOVICH M. Z+, ZH. ORGAN. XIMII, 1981, 17, HO 5, 1080-1087
作者:KOLESOVA M. B.、 MURAVICH-ALEKSANDR X. L.、 SMIRNOVA N. V.、 GIRSHOVICH M. Z+
DOI:——
日期:——
Synthesis and Regioselective N- and O-Alkylation of 1<i>H</i>- or 3<i>H</i>-[1,2,3]Triazolo[4,5-<i>d</i>]pyrimidine-5,7(4<i>H</i>,6<i>H</i>)-diones (8-Azaxanthines) and Transformation of Their 3-Alkyl Derivatives into 1-Alkyl Isomers
作者:Tomohisa Nagamatsu、Rafiqul Islam
DOI:10.1055/s-2006-950337
日期:——
alkylating agents, for example alkyl halides and dimethyl sulfate, were employed in aprotic Solvents Under a variety of conditions for the alkylation of mono- and disubstituted 1H- or 3H-[1,2,3]triazolo[4,5-d]pyrimidine-5,7(4H,6H)-diones, which were prepared by cyclization of the appropriate 5,6-diaminouracils with nitrous acid. The alkylation on the triazole ring in the presence of anhydrous potassium carbonate
Regioselective N- and O-Alkylation of 3H-[1,2,3]triazolo[4,5-d]pyrimidine-5,7(4H,6H)-diones (8-Azaxanthines) and Transformation of 3-Alkyl Derivatives into 1-Alkyl Isomers
作者:Tomohisa Nagamatsu、Rafiqul Islam
DOI:10.3987/com-06-10807
日期:——
The alkylation on the pyrimidine ring of 3-methyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine-5,7(4H,6H)-diones (1) with an equimolecular amount of alkylating agent in the presence of anhydrous potassium carbonate in aprotic solvents under heating took place only at the 4-position. The similar alkylation on the triazole ring of 6-methyl-1H-[1,2,3]triazolo[4,5-d]-pyrimidine5,7(4H,6H)-diones (4) with an equivalent alkylating reagent happened simultaneously at the 1- and 2-positions with the priority at the 2-position. On the other hand, the alkylation of 3,6-disubstituted derivatives (12a-d) at room temperature led to the 5-O-alkylation (14a-e) accompanied with the 4-N-alkylation (3a, 13a-d), but at high temperature only the 4-N-alkylation occurred. The 3,4,6-tri-substituted derivatives (3a, 13d) underwent transformation with excess alkylating agents at high temperature leading to the formation of 1,4,6-tri-substituted derivatives (7, 15) with elimination of the 3-substituent in the same manner as xanthine.