Stimulation of the serotoninergic innervation of the leech pharynx or application of serotonin to the isolated pharynx induced four distinct types of contractile activity: an increase in basal tonus, large phasic contractions of 10-15 s in duration, smaller phasic contractions occurring at approximately 1 Hz, and a relaxation after washout of serotonin. Application to the isolated pharynx of th...

In the crystal structure of the title compound, C(23)H(31)N(3)O(2+)·2C(6)H(2)N(3)O(7) (-), {systematic name: 1-[3-(5H-dibenz[b,f]azepin-5-yl)prop-yl]-4-(2-hy-droxy-eth-yl)piperazine-1,4-diium bis-(2,4,6-trinitro-phrenolate)} the piperazine group in the opipramol dication is protonated at both N atoms. Each picrate anion inter-acts with the protonated N atom in the cation through a bifurcated N-...

In the title mol-ecule, C(26)H(28)F(2)N(2)O, the piperazine ring adopts a chair conformation, with the N-bonded substituents in equatorial orientations. The dihedral angle between the fluoro-benzene rings is 69.10 (15).

In the title compound, C18H20Cl2N2O2S, the piperazine ring adopts a chair conformation. The dihedral angle between the sulfonyl-bound benzene ring and the best-fit plane through the six non-H atoms of the piperazine ring is 72.22 (12)°; those between the di-chloro-benzene ring and the sulfonyl and piperazine rings are 2.44 (13) and 74.16 (2)°, respectively. In the crystal, mol-ecules are connec...

In the title compound, C20H27N5O3, the central piperazine ring adopts a chair conformation, with the N-bound carboxyl-ate and methyl-ene substituents occupying bis-ectional and equatorial orientations, respectively. A twist is evident between the aromatic rings [dihedral angle = 25.61 (9)°] but an intra-molecular O-H⋯N hydrogen bond persists between these. Supra-molecular tapes along [1-10] are...

In the title mol-ecule, C(29)H(28)F(2)N(2)O, the piperazine ring adopts a chair conformation with the pendant N-C bonds in equatorial orientations. The conformation of the N-C-C-O linkage is gauche [torsion angle = -64.6 (4)°] and the dihedral angle between the fluoro-benzene rings is 64.02 (15)°.

In the title compound, C(28)H(35)N(3)O(4), the piperidine ring adopts a boat conformation while the piperazine ring adopts a chair conformation with an equatorial orientation of the phenyl groups. The dihedral angle between the mean planes of the benzene rings is 74.14 (8)°. The mol-ecular conformation is stabilized by a weak intra-molecular C-H⋯N inter-action and the crystal packing is stabili...

The title compound, C(23)H(30)ClN(5)O(3) (2+)·2Cl(-)·0.5H(2)O, was synthesized by N-alkyl-ation of 1-({[5-(4-chloro-phen-yl)-2-furan-yl]methyl-ene}amino)-2,4-imidazolidinedione with 1-bromo-4-chloro-butane, and N-methyl-piperazine. In the crystal, the cations, anions and water mol-ecules are linked by O-H⋯Cl and N-H⋯Cl hydrogen bonds.

New mu-opioid receptor (MOR) agonists containing piperazine and homopiperazine moieties in the structures were synthesized and their affinities to and agonist potencies on MOR were evaluated. Among the synthesized compounds, 4-[4-(2-methoxyphenyl)piperazin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide (20 Aa) showed the highest affinity to the human MOR expressed in Chinese hamster ovary (CHO)-K1 c...

Some new Mannich Bases of 1, 4 Dihydropyridine derivatives were synthesised by reaction of 1, 4 Dihydropyridine derivatives formaldehyde (HCHO) & secondary amines (e.g. morpholine, 1-methyl piperazine) in 1:1 ratio under acidic condition in presence of trace HCl. The compounds synthesised were identified by UV, 1H NMR, and FT-IR spectroscopic techniques. All compounds studied in this work were ...