- Hydrogen bonding in nitroaniline analogues: Hydrogen-bonded sheets in 2-amino-4,6-dimethoxy-5-nitropyrimidine and π-stacked hydrogen-bonded sheets in 4-amino-2,6-dimethoxy-5-nitropyrimidine
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In 2-amino-4,6-dimethoxy-5-nitropyrimidine, C6H8N4O4, the molecules are linked by one N-H...N and one N-H...O hydrogen bond to form sheets built from alternating R22(8) and R66(32) rings. In isomeric 4-amino-2,6-dimethoxy-5-nitropyrimidine, C6H8N4O4, which crystallizes with Z′ = 2 in P1macr;, the two independent molecules are linked into a dimer by two independent N-H...N hydrogen bonds. These dimers are linked into sheets by a combination of two-centre C-H...O and three-centre C-H...(O)2 hydrogen bonds, and the sheets are further linked by two independent aromatic π-π-stacking interactions to form a three-dimensional structure.
- Glidewell, Christopher,Low, John N.,Melguizo, Manuel,Quesada, Antonio
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- Synthesis and cyclization of novel lumazine - Enediyne chimeras
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Lumazine derivatives (6-8), appended with ethynyl groups in positions 7 and 8, were synthesized and examined for their ability to undergo Bergman cyclization. Oxo compound (7) was found to give good yields of Bergman cyclization products (? 37 %), whereas the analogues (6) and (8) did not cyclize as efficiently or gave no identifiable cyclization products.
- Choy, Nakyen,Russell, Keith C.
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- Herbicidal pyridyl sulfonamides
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Certain N-[(pyridyl or pyrimidyl)aminocarbonyl]arylsulfonamides, such as the compound methyl 2-[[N-(3-cyano-4,6-dimethylpyridin-2-yl)aminocarbonyl]aminosulfonyl]benzoate, possess herbicidal activity.
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- Lower alkyl 2-[[N-(3-cyano-pyridin-2-yl)aminocarbonyl]aminosulphonyl]benzoate derivatives having herbicidal activity
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Certain N-[(pyridyl or pyrimidyl)aminocarbonyl]arylsulfonamides, such as the compound methyl 2-[[N-(3-cyano-4,6-dimethylpyridin-2-yl)aminocarbonyl]aminosulfonyl]benzoate, possess herbicidal activity.
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- Nucleosides, XXXIII. Synthesis of 7-Oxo-8-β-D-ribofuranosyl-7,8-dihydrolumazine and its 6-Methyl Derivative
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The synthesis of 7-oxo-8-β-D-ribofuranosyl-7,8-dihydrolumazine (26) and its 6-methyl derivative (28) has been achieved by a ribosylation reaction of 2,4-bis(benzyloxy)- (18) and 2,4-bis(benzyloxy)-6-methyl-7-oxo-7,8-dihydropteridine (19), respectively, un
- Ritzmann, Goetz,Ienaga, Kazuharu,Kiriasis, Leonidas
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p. 1535 - 1548
(2007/10/02)
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