Regioselective N-Methylation of Methylthio-Substituted Pyrimidinones and 1,2,4-Triazinone with Methanol over H-Y Zeolite.
摘要:
Liquid - phase methylation of 2-methylthio-4-pyrimidone (4), 6-methyl-2-methylthio-4-pyrimidone (5) and 6-methyl-3-methylthio-1,2,4-triazine-5-one (6) with MeOH over HY-Zeolite selectively gave 1-methyl-2-methylthio-4-pyrimidone (7),1,6-dimethyl-2-methylthio-4-pyrimidone (9) and 2,6-dimethyl-3-methylthio-1,24-triazine-5-one (11), respectively. Methyl iodide or dimethyl sulfate have been used as methylating agents for pyrimidines(1-3) and 1,2,4-triazines(4,5). Alkylation of 2-thiouracil (1) and 6-methyl-2-thiouracil (2) with methyl iodide under basic conditions is known to lead.
Antithyroid Drugs and their Analogues Protect Against Peroxynitrite-Mediated Protein Tyrosine Nitration-A Mechanistic Study
作者:Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1002/chem.200902145
日期:2010.1.25
the presence of a thione or selone moiety is important for an efficient inhibition. Similarly, the replacement of NH moiety in MMI by N‐methyl or N‐m‐methoxybenzyl substituents dramatically reduces the antioxidant activity of the parent compound. Theoretical studies indicate that the substitution of NH moiety by NMe significantly increases the energy required for the oxidation of sulfur center by
Polyfunctional Derivatives of Isocytosine. Effect of Hydration on Prototropic Tautomerism of 2-(2-Hydroxyethyl)amino-6-methylpyrimidin-4(3H)-one
作者:A. V. Erkin、V. I. Krutikov
DOI:10.1007/s11176-005-0287-x
日期:2005.4
Hydration of 2-(2-hydroxyethyl)amino-6-methylpyrimidin-4(3 H )-one forms an equilibrium mixture of 4-oxo-3,4-dihydro and 4-hydroxy tautomers. The intermediate in mutual transitions of these tautomers has a zwitter ionic structure. The equilibrium shifts to the 4-oxo-3,4-dihydro form as the polarity of the medium decreases.
THE BEHAVIOR OF 6-METHYL-2-THIOURACIL TOWARDS WITTIG-HORNER REAGENTS
作者:El-Sayed M.A. Yakoup、Dalal B. Giurgius、L. S. Boulos
DOI:10.1080/10426509908037009
日期:1999.5.1
6-Methyl-2-thiouracil (1) reacts with Wittig-Horner (2a-e) reagents to give the new products 3, 4, 6, 7 and 9 along with the alkylated derivatives 5, 8 and 10. When 1 was treated with 2e and/or 2f, the alkylated compound 10 is the sole reaction prduct. Possible reaction mechanism are considered and the structural assignments are based on compatible analytical and spectroscopic results.
Senda; Suzui, Chemical and pharmaceutical bulletin, 1958, vol. 6, p. 476,478
作者:Senda、Suzui
DOI:——
日期:——
Regioselective N-Methylation of Methylthio-Substituted Pyrimidinones and 1,2,4-Triazinone with Methanol over H-Y Zeolite.
作者:Majid M. Heravi、Hossian A. Oskooi、Morteza Mafi
DOI:10.1080/00397919708004083
日期:1997.5
Liquid - phase methylation of 2-methylthio-4-pyrimidone (4), 6-methyl-2-methylthio-4-pyrimidone (5) and 6-methyl-3-methylthio-1,2,4-triazine-5-one (6) with MeOH over HY-Zeolite selectively gave 1-methyl-2-methylthio-4-pyrimidone (7),1,6-dimethyl-2-methylthio-4-pyrimidone (9) and 2,6-dimethyl-3-methylthio-1,24-triazine-5-one (11), respectively. Methyl iodide or dimethyl sulfate have been used as methylating agents for pyrimidines(1-3) and 1,2,4-triazines(4,5). Alkylation of 2-thiouracil (1) and 6-methyl-2-thiouracil (2) with methyl iodide under basic conditions is known to lead.