3-Isobutyl-5,5,7-tris(3-methylbut-2-en-1-yl)-1-phenyl-1,7-dihydro-4H-indazole-4,6(5H)-dione

Here we describe the functionalization of lupulone natural compound in obtaining 3-isobutyl-5,5,7-tris(3-methylbut-2-en-1-yl)-1-phenyl-1,7-dihydro-4H-indazole-4,6(5H)-dione. The lupulone-H-indazole derivative was prepared with 75% yield through the reaction between lupulone and phenyl-hydrazine employing SiO2/ZnCl2 (30% m/m) as a support solid in a solvent-free condition. Based on the possibilities of products, a complete NMR structural characterization of this lupulone-H-indazole was performed by 1H, 13C{1H}, COSY, HSQC and HMBC NMR experiments, showing an important contribution in producing the first results related to lupulone reactivity.

1-Benzyl-3-hydroxy-4-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one

The title compound, C22H20N2O2, forms chains in the [001] direction in the monoclinic crystal, through N—H...O hydrogen bonding. The chains are associatedviaO—H...π(ring) and C—H...π(ring) interactions involving one phenyl ring and the benzene ring of the benzodiazepine as acceptors. For these intermolecular contacts, the H...π separations are close to 2.7 Å.

3-Hydroxy-4-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one:cisisomer

In the title compound, C15H14N2O2, the seven-membered benzodiazepine ring adopts a twist-boat conformation and the two aromatic rings are inclined to one another by 81.06 (15)°. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains propagating along the [10-1] direction. The chains are linked by C—H...O hydrogen bonds, forming sheets parallel to theacplane. Within the sheets, there are N—H...π interactions present, and C—H...π interactions link the sheets to form a three-dimensional structure.

(3S,4S)-4-Phenyl-1,5-bis(prop-2-en-1-yl)-3-(prop-2-en-1-yloxy)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one

In the title compound, C24H26N2O2, the dihedral angle between the benzene rings is 45.69 (7)°. In the crystal, the molecules form helical supramolecular chains running parallel to thebaxisviaweak C—H...O hydrogen bonds.

NaHSO4-SiO2-Promoted Solvent-Free Synthesis of Benzoxazoles, Benzimidazoles, and Benzothiazole Derivatives

An efficient protocol has been developed for the preparation of a library of benzoxazole, benzimidazole, and benzothiazole derivatives from reactions of acyl chlorides witho-substituted aminoaromatics in the presence of catalytic amount of silica-supported sodium hydrogen sulphate under solvent-free conditions. Simple workup procedure, high yield, easy availability, reusability, and use of ecofriendly catalyst are some of the striking features of the present protocol.