4-[2-(1-Acetyl-2-oxopropyl­idene)­hydrazino]-N-(pyrimidin-2-yl)benzene­sulfonamide

In the title compound, C15H15N5O4S, the dihedral angle between the pyrimidine and benzene rings is 84.56 (2)°. Intra­molecular hydrazine–carbonyl N—H⋯O and inter­molecular sulfonamide–pyridimine N—H⋯N hydrogen bonds stabilize the mol­ecular and crystal structures, respectively

3-(2,4-Dichloro­phen­yl)-5-(4-fluoro­phen­yl)-2-methyl-7-(trifluoro­meth­yl)pyrazolo­[1,5-a]pyrimidine

In the title compound, C20H11Cl2F4N3, the central pyrazolo­[1,5-a]pyrimidine unit is almost planar [the mean deviation from the best least-square plane through the nine atoms is 0.006 (2) Å]. The fluoro­benzene ring is rotated out of this plane by 10.3 (3)°, whereas the dichloro­benzene ring is rotated by 46.2 (3)°. The crystal packing is dominated by Cl⋯Cl inter­actions of 3.475 (3) Å and van der Waals inter­actions

2-Methyl-5-(4-tol­yl)-7-(trifluoro­meth­yl)pyrazolo[1,5-a]pyrimidine

In the title compound, C15H12F3N3, the pyrazolo[1,5-a]pyrimidine system ring is essentially planar with a maximum deviation from the mean plane of 0.014 (1) Å. The 4-tolyl group makes a dihedral angle of 14.1 (1)° with the pyrazolo[1,5-a]pyrimidine ring system. The crystal packing is stabilized mainly by van der Waals forces