Crystal Structures Of (Z)-5-[2-(benzo[b]thio-phen-2-yl) - PubMed

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Abstract

(Z)-5-[2-(Benzo[b]thio-phen-2-yl)-1-(3,5-di-meth-oxy-phen-yl)ethen-yl]-1H-tetrazole methanol monosolvate, C19H16N4O2S·CH3OH, (I), was prepared by the reaction of (Z)-3-(benzo[b]thio-phen-2-yl)-2-(3,5-di-meth-oxy-phen-yl)acrylo-nitrile with tri-butyl-tin azide via a [3 + 2]cyclo-addition azide condensation reaction. The structurally related compound (Z)-5-[2-(benzo[b]thio-phen-3-yl)-1-(3,4,5-tri-meth-oxy-phen-yl)ethen-yl]-1H-tetra-zole, C20H18N4O3S, (II), was prepared by the reaction of (Z)-3-(benzo[b]thio-phen-3-yl)-2-(3,4,5-tri-meth-oxy-phen-yl)acrylo-nitrile with tri-butyl-tin azide. Crystals of (I) have two mol-ecules in the asymmetric unit (Z' = 2), whereas crystals of (II) have Z' = 1. The benzo-thio-phene rings in (I) and (II) are almost planar, with r.m.s deviations from the mean plane of 0.0084 and 0.0037 Å in (I) and 0.0084 Å in (II). The tetra-zole rings of (I) and (II) make dihedral angles with the mean planes of the benzo-thio-phene rings of 88.81 (13) and 88.92 (13)° in (I), and 60.94 (6)° in (II). The di-meth-oxy-phenyl and tri-meth-oxy-phenyl rings make dihedral angles with the benzo-thio-phene rings of 23.91 (8) and 24.99 (8)° in (I) and 84.47 (3)° in (II). In both structures, mol-ecules are linked into hydrogen-bonded chains. In (I), these chains involve both tetra-zole and methanol, and are parallel to the b axis. In (II), mol-ecules are linked into chains parallel to the a axis by N-H⋯N hydrogen bonds between adjacent tetra-zole rings.

Keywords: 5-substituted-1H-tetra­zoles; anti­cancer agents; crystal structure; hydrogen bonding; tetra­zole-tethered combretastatin A-4 analogs.

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Figures

Figure 1

Figure 1

The mol­ecular structure of (I),…

Figure 1

The mol­ecular structure of (I), with displacement ellipsoids drawn at the 50% probability…

Figure 1 The mol­ecular structure of (I), with displacement ellipsoids drawn at the 50% probability level.
Figure 2

Figure 2

The mol­ecular structure of (II),…

Figure 2

The mol­ecular structure of (II), with displacement ellipsoids drawn at the 50% probability…

Figure 2 The mol­ecular structure of (II), with displacement ellipsoids drawn at the 50% probability level.
Figure 3

Figure 3

Crystal packing of (I), viewed…

Figure 3

Crystal packing of (I), viewed down the c axis.

Figure 3 Crystal packing of (I), viewed down the c axis.
Figure 4

Figure 4

Crystal packing of (II), viewed…

Figure 4

Crystal packing of (II), viewed down the c axis.

Figure 4 Crystal packing of (II), viewed down the c axis.
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