2,5-Dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline

Jaime Portilla; Jairo Quiroga; Justo Cobo; John N Low; Christopher Glidewell

doi:10.1107/S0108270107029010

2,5-Dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline

Acta Crystallogr C. 2007 Aug;63(Pt 8):o458-61. doi: 10.1107/S0108270107029010. Epub 2007 Jul 14.

Authors

Jaime Portilla¹, Jairo Quiroga, Justo Cobo, John N Low, Christopher Glidewell

Affiliation

¹ Grupo de Investigación de Compuestos Heterocíclicos, Departamento de Química, Universidad de Valle, AA 25360, Colombia.

PMID: 17675696
DOI: 10.1107/S0108270107029010

Abstract

In both 2,5-dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C(16)H(15)N(3), (I), and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C(19)H(21)N(3), (II), which crystallizes with Z' = 2 in the space group P\overline{1}, the non-aromatic carbocyclic rings adopt screw-boat conformations. The molecules of (I) are linked into chains of rings by a combination of C-H...N and C-H...pi(arene) hydrogen bonds, while in (II) there are no hydrogen bonds of any kind.