G. Le Baut

3-Sulfure de 3-mercapto-5,7-diméthyl-2-phényl-3H-[1,4,2]diazaphospholo[1,5-a]pyridinium

The entire molecule of 5,7-dimethyl-2-phenyl-3-thioxo-3H-[1,4,2]diazaphospholo[1,5-a]pyridinium-3thiolate, C 14 H 13 N 2 PS 2 , with the exception of the two S atoms, is approximately planar. The π electrons of the N(7)-C(8) bond are partially conjugated with those of the phenyl and pyridinyl rings. The P-C and P-S bond lengths are not significantly different to distances in related compounds. However, the P-S bonds are shorter than terminal P-S bonds in thiophosphates. The P-N distance [1.819 (3) A] indicates partial ionic character

Structure du N-phényltroloxamide et du N-phényltroloxthioamide, inhibiteurs de leucotriènes

Both compounds [N-phenyl-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxamide (N-phenyltroloxamide), C 20 H 23 NO 3 , and N-phenyl-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carbothioxamide (N-phenyltroloxthioamide), C 20 H 23 NO 2 S] have very similar molecular geometries. The dihydropyranic ring displays a half-chair conformation. There is a delocalized orbital over the amide or the thioamide group. In each molecule, a strong N-H...O and a weak C-H...O or C-H...S intramolecular hydrogen bond form two pseudocycles

4-(4,6-Diméthylpyrid-2-yl)-5-éthyl-3-(furan-2-yl)-4H-1,2,4-triazole

The title compound has anti-inflammator y properties. The three rings in the molecule are planar with dihedral angles between their least-squares planes of 70.20 (8), 68.48 (9) and 9.5 (4) °. The structure can be regarded as being composed of two layers of molecules which spread out along the (101) plane. Its cohesion is due to van der Waals interactions.

N2-(4,6-diméthylpyrid-2-yl)-N1-méthylpyrazine-2-carboxamidine

The title molecule, C 13 H 15 N 5 , shows a cis configuration. It comprises three approximately planar moieties: an N 2 -(4,6-dimethylpyridine), an N 1 methyl-carboxamidine group and a pyrazinyl ring. To avoid steric hindrance, the two rings are twisted out of the plane of the imine double bond. There is a delocalized orbital over the amidine group. The structure comprises two chains of molecules which spread out along the two 2 1 axes situated in the (101) plane. In each chain, the molecules are linked to one another by an N−H...N hydrogen bond [2.976 (2) A, 160 (2)°]

N-(2,6-Diméthylphényl)-6-hydroxy-2,5,7,8-tétraméthyl-3,4-dihydro-2H-1-benzopyran-2-carboxamide

The title compound, C 22 H 27 NO 3 , belongs to a class of compounds which are potent inhibitors of lipid peroxidation. Furthermore, it is very effective at inhibiting leukotrienes biosynthesis. The benzenic rings are planar or approximately planar and the pyran ring displays a half-chair conformation. There is a delocalized orbital over the amide group. An intramolecular N-H...O hydrogen bond [2.558 (3) A, 112 (3) o ] forms a pseudo-cycle. The molecules are linked together by O-H...O hydrogen bonds [2.824 (3) A, 160 (4) o ] which form infinite chains in the direction of the c axis

4-(4,6-Diméthylpyrid-2-yl)-5-éthyl-3-phényl-4H-1,2,4-triazole

The title compound, C 17 H 18 N 4 , is a structural analogue of N-(4,6-dimethylpyrid-2-yl)benzamide, with a triazolic heterocycle instead of the amide function, affording stronger anti-inflammatory properties. The three rings in the molecule are planar with dihedral angles between their least-squares planes of 73.4 (2), 70.7 (2) and 38.8 (4) o . The crystal structure can be regarded as a stack of molecular layers parallel to the (001) plane

(2E,4E,6E)-7-(6-Méthyl-2H-1-benzopyran-3-yl)hepta-2,4,6-triénoate d'éthyle

The effects of retinoids on cell differentiation and proliferation, as well as on the inflammatory process, have been well documented, but so far their clinical use has been affected by teratogenicity and hypervitaminosis A [Loeliger, Bollag & Maier (1980). Eur. J. Med. 15, 9-15]. The need for safer drugs led to the synthesis of new oxaretinoids. The title compound, (2E,4E,6E)-ethyl 7-(6-methyl-2H-1-benzopyran-3-yl)hepta-2,4,6-trienoate, C 19 H 20 O 3 , is an oxaretinoid resulting from the integration of the fourth double bond of retinoic acid into a pyran ring

N-(4,6-Diméthylpyrid-2-yl)-2-(3-nitrophényl)acétamide

The molecule of the title compound can be regarded as being composed of two parts, an N-(4,6-dimethylpyrid-2-yl)acetamide group and a 3-methylnitrobenzene group, which share the C(9) atom. The two parts are approximately planar. The least-squares planes through the pyridyl and phenyl rings make an angle of 64.5 (1) o . An intramolecular hydrogen bond [C(3)-H(3)...O(18):2.870 (4) A, 114 (3) o ] forms a pseudo ring and contributes to the planarity of the N-(4,6-dimethylpyrid-2-yl)acetamide group. The molecules are linked together by the N(7)H(7)...O(18 i ) hydrogen bond [(i) x, 1/2-y, 1/2+z; 2.859 (3) A, 170 (3) o ]. They form two chains parallel to the c axis and related by a centre of symmetry