Hydrogen-bonded chains of rings in 3-<i>tert</i>-butyl-1-phenyl-7-(4-trifluoromethylbenzyl)-4,5,6,7-tetrahydro-1<i>H</i>-pyrazolo[3,4-<i>b</i>]pyridine-5-spiro-1′-cyclohexane-2′,6′-dione and 3-<i>tert</i>-butyl-7-(4-methoxybenzyl)-1-phenyl-4,5,6,7-tetrahydro-1<i>H</i>-pyrazolo[3,4-<i>b</i>]pyridine-5-spiro-1′-cyclohexane-2′,6′-dione
作者:Jorge Trilleras、Silvia Cruz、Justo Cobo、John N. Low、Christopher Glidewell
DOI:10.1107/s0108270108038808
日期:2008.12.15
In each of 3-tert-butyl-1-phenyl-7-(4-trifluoromethylbenzyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-spiro-1'-cyclohexane-2',6'-dione, C29H30F3N3O2, (I), and 3-tert-butyl-7-(4-methoxybenzyl)-1-phenyl-4,5,6,7-tetrahydro-1H-pyrazolo-[3,4-b]pyridine-5-spiro-1'-cyclohexane-2',6'-dione, C29H33N3O3, (II), the reduced pyridine ring adopts a half-chair conformation. The molecules of compound (I) are linked by two C-H center dot center dot center dot O hydrogen bonds to form a C(5)C(5)[R-2(1)(8)] chain of rings, while in compound (II), two C-H center dot center dot center dot O hydrogen bonds link the molecules into a C(6)C(7)[R-2(2)(11)] chain of rings, which is further reinforced by a C-H center dot center dot center dot pi hydrogen bond. The significance of this study lies in its observation of significant differences in hydrogen-bonded structures consequent upon very minor changes in remote substituents.