9,9-Dimethyl-12-(3-nitro­phen­yl)-7,8,9,10,11,12-hexa­hydro­benz[a]acridin-11-one

The title compound, C25H22N2O3, was synthesized by the reaction of 3-nitro­benzaldehyde, dimedone and 2-naphthyl­amine in ethanol. In the mol­ecular structure, the cyclo­hexenone ring adopts an envelope conformation, whereas the piperidine ring has a boat conformation. The crystal packing is stabilized by inter­molecular N—H⋯O hydrogen bonds

2-Amino-4-(2-chloro­phen­yl)-5,10-dioxo-5,10-dihydro-4H-benzo[g]chromene-3-carbonitrile

In the mol­ecule of the title compound, C20H11ClN2O3, the pyran ring adopts a flattened-boat conformation. In the crystal structure, inter­molecular N—H⋯N and N—H⋯O hydrogen bonds generate edge-fused R 2 2(12) and R 2 2(14) ring motifs; the hydrogen-bonded motifs are linked to each other, forming a three-dimensional network. A π–π contact [centroid-to-centroid distance = 3.879 (3) Å] between the chloro­phenyl rings may further stabilize the structure

14-(1,3-Benzodioxol-5-yl)-7,14-dihydro­dibenzo[a,j]acridine

The title compound, C28H19NO2, was synthesized by the reaction of 1,3-benzodioxole-5-carbaldehyde with naphthalen-2-amine catalyzed by thio­salicylic acid in acetic acid. The central dihydropyridine ring adopts a boat conformation. The two planar (r.m.s. deviations = 0.0158 and 0.0552 Å) bicyclic parts make a dihedral angle of 16.16 (5)° with respect to each other. The crystal packing is stabilized by inter­molecular N—H⋯O hydrogen bonds and C—H⋯π inter­actions

6-Amino-4-(4-chloro­phen­yl)-2-oxo-1,2-dihydro­pyridine-3,5-dicarbonitrile ethanol solvate

The title compound, C13H7ClN4O·C2H6O, was synthesized by the reaction of 4-chloro­benzaldehyde, malononitrile and 10% sodium hydroxide solution in an aqueous medium. In the crystal structure, the crystal packing is stabilized by inter­molecular N—H⋯N, O—H⋯O and N—H⋯O hydrogen bonds

3,6-Dimethyl-1-phenyl-4-(2-thien­yl)-8-(2-thienylmethyl­ene)-5,6,7,8-tetra­hydro-1H-pyrazolo[3,4-b][1,6]naphthyridine

In the mol­ecule of the title compound, C26H22N4S2, the pyrazole ring is oriented at a dihedral angle of 0.85 (3)° with respect to the adjacent naphthyridine ring, while the other ring of naphthyridine adopts an envelope conformation. The dihedral angle between phenyl and pyrazole rings is 87.65 (3)°. In the crystal structure, weak inter­molecular C—H⋯N inter­actions link the mol­ecules into chains. The π–π contacts between the naphthyridine rings and the naphthyridine and thio­phene rings [centroid–centroid distances = 3.766 (3) and 3.878 (3) Å] may further stabilize the structure. A weak C—H⋯π inter­action is also present

A highly efficient green synthesis of 1, 8-dioxo-octahydroxanthenes

SmCl3 (20 mol%) has been used as an efficient catalyst for reaction between aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione at 120°C to give 1,8-dioxo-octahydroxanthene derivatives in high yield. The same reaction in water, at room temperature gave only the open chain analogue of 1,8-dioxo-octahydroxanthene. Use of eco-friendly green Lewis acid, readily available catalyst and easy isolation of the product makes this a convenient method for the synthesis of either of the products

3,3-Dimethyl-10-(4-methoxyphenyl)-9-(4-nitrophenyl)-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dioneContribution No. 20272019.

The title compound, C28H28N2O5, consists of a partially hydrogenated acridine ring system with two substituted phenyl substituents on the dihydropyridine ring which are both nearly perpendicular to the mean plane of the acridine unit [dihedral angles of 81.3 (1) and 89.6 (1)° between the central ring of acridine and the methoxyphenyl and nitrophenyl rings, respectively]. The dihydropyridine ring is almost planar, whereas both the outer unsymmetrical six-membered rings adopt half-chair conformations