9-(Thio-phen-2-yl)-8,9-dihydro-3H-pyrazolo-[4,3-f]quinolin-7(6H)-one ethanol monosolvate.

In the title compound, C(14)H(11)N(3)OS·C(2)H(5)OH, the dihedral angle between the pyridine N-C(fused)-C(fused)-C(thio-phene) plane and the plane of the thio-phene ring is 81.9 (3)°, indicating that they are close to perpendicular. The dihedral angle between this pyridine plane and the benzene ring is 1.3 (3)°. The thio-phene ring is disordered over two coplanar orientations with an occupancy ratio of 0.692 (7):0.308 (7), while the ethanol solvent mol-ecule is also disordered over two sets of site in a 0.66 (4):0.34 (4) ratio. In the crystal, chains are formed along the b axis by N-H⋯O and O-H⋯N inter-actions with adjacent chains being connected through C-H⋯N and C-H⋯S inter-actions.

5-(4-Chloro-phen-yl)-1-methyl-3-phenyl-3,6,8,9-tetra-hydro-pyrazolo-[3,4-b]thio-pyrano[4,3-d]pyridine.

The title compound, C(22)H(18)ClN(3)S, was synthesized by the reaction of 4-chloro-benzaldehyde, tetra-hydro-thio-pyran-4-one and 3-methyl-1-phenyl-1H-pyrazol-5-amine in acetic acid without a catalyst. The pyridine and pyrazole rings are almost coplanar, the dihedral angle between their mean planes being 2.50 (1)°. The thio-pyran ring exhibits an envelope conformation. The crystal packing is stabilized by inter-molecular C-H⋯Cl hydrogen bonds and by C-H⋯π and π-π inter-actions [centroid-centroid distances of 3.825 (2) Šbetween pyridine rings and 3.557 (2) Šbetween pyrazole and pyridine rings.

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

The title compound, C(28)H(19)NO(2), was synthesized by the reaction of 1,3-benzodioxole-5-carbaldehyde with naphthalen-2-amine catalyzed by thio-salicylic 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 inter-molecular N-H⋯O hydrogen bonds and C-H⋯π inter-actions.

9,9-Dimethyl-12-(3-nitro-phen-yl)-7,8,9,10,11,12-hexa-hydro-benz[a]acridin-11-one.

The title compound, C(25)H(22)N(2)O(3), was synthesized by the reaction of 3-nitro-benzaldehyde, dimedone and 2-naphthyl-amine in ethanol. In the mol-ecular structure, the cyclo-hexenone ring adopts an envelope conformation, whereas the piperidine ring has a boat conformation. The crystal packing is stabilized by inter-molecular N-H⋯O hydrogen bonds.

6-Amino-4-(4-chloro-phen-yl)-2-oxo-1,2-dihydro-pyridine-3,5-dicarbonitrile ethanol solvate.

The title compound, C(13)H(7)ClN(4)O·C(2)H(6)O, was synthesized by the reaction of 4-chloro-benzaldehyde, malononitrile and 10% sodium hydroxide solution in an aqueous medium. In the crystal structure, the crystal packing is stabilized by inter-molecular N-H⋯N, O-H⋯O and N-H⋯O hydrogen bonds.

An efficient route for the synthesis of a new class of pyrido[2,3-d]pyrimidine derivatives.

A new reaction of 4-arylidene-3-methylisoxazol-5(4H)-one or 4-arylidene-2-phenyloxazol-5(4H)-one with 2,6-diaminopyrimidin-4(3H)-one is described and a number of new pyrido[2,3-d]pyrimidine-4,7-dione derivatives are synthesized. This protocol has the advantages of good yields, broad substrate scope and simple work-up.

An efficient and chemoselective synthesis of N-substituted 2-aminopyridines via a microwave-assisted multicomponent reaction.

A facile and selective synthesis of N-substituted 2-aminopyridines is accomplished via microwave-assisted multi-component reactions controlled by the basicity of amine and the nature of solvent. In addition, a possible mechanism accounting for the reaction was proposed.

2-Amino-4-(4-bromo-phen-yl)-6-ferro-cenyl-pyridine-3-carbonitrile.

The title compound, [Fe(C(5)H(5))(C(17)H(11)BrN(3))], was synthesized by the reaction of 4-bromo-benzaldehyde, acetyl-ferrocene and ammonium acetate in an aqueous medium. The crystal packing is stabilized by inter-molecular N-H⋯N hydrogen bonds. The dihedral angles between the phenyl ring and the pyridine and cyclopentadienyl rings are 51.67 (13) and 12.12 (21)°, respectively.

Efficient and direct synthesis of poly-substituted indeno[1,2-b]quinolines assisted by p-toluene sulfonic acid using high-temperature water and microwave heating via one-pot, three-component reaction.

Reactions of aldehydes, 1,3-indanedione and enaminones were successfully carried out using p-toluene sulfonic acid (p-TsOH) as a catalyst and high-temperature water as a solvent under microwave irradiation. This method provided several advantages such as rapid reaction times, high yields, and a simple workup procedure. In addition, a possible mechanism to account for the reaction was proposed.

An efficient one-pot, three-component synthesis of indeno[1,2-b]quinoline-9,11(6H,10H)-dione, acridine-1,8(2H,5H)-dione and quinoline-3-carbonitrile derivatives from enaminones.

An efficient one-pot, three-component method for the preparation of indeno[1,2-b]quinoline-9,11(6H,10H)-dione, acridine-1,8(2H,5H)-dione and various multi-substituted quinoline-3-carbonitrile derivatives has been developed through the Michael addition to enaminones, which was achieved by both microwave irradiation and conventional heating.

New potential inhibitors of cyclin-dependent kinase 4: design and synthesis of pyrido[2,3-d]pyrimidine derivatives under microwave irradiation.

A simple and efficient synthesis of 2-amino pyrido[2,3-d]pyrimidine derivatives was accomplished via a three-component reaction under microwave irradiation without catalyst. This method had many dramatic advantages such as the short reaction time, high yield, and broad substrate scope, as well as convenient operation. We provide new series of potential biologically active compounds as inhibitors of Cdk4.

New potential biologically active compounds: design and an efficient synthesis of N-substituted 4-aryl-4,6,7,8-tetrahydroquinoline-2,5(1H,3H)-diones under microwave irradiation.

A series of N-substituted 4-aryl-4,6,7,8-tetrahydroquinoline-2,5(1H,3H)-diones were synthesized through a rapid one-pot four-component reaction under microwave irradiation. The method has the advantages of excellent yields (82-96%) and short reaction time (4-9 min). We provide new series of potential biologically active compounds for biomedical screening.