Structural studies on benzothiazoles. Crystal and molecular structure of 5,6-dimethoxy-2-(4-methoxyphenyl-benzothiazole and molecular orbital calculations on related compounds.
作者:Paul C Yates、Carol J Mccall、Malcolm Fg Stevens
DOI:10.1016/s0040-4020(01)86576-5
日期:1991.8
dimensional crystal structure. Crystals are monoclinic, space group P21/c, a=17.142(1), b=11.165(1), c=7.683(2)Å, β=101.34(1)°. 2307 Reflections were refined to R=0.039. The inter-ring twist angle is 21°, greater than in 2-(o-hydroxyphenyl)benzothiazole but similar to that in 2-(4′-bromophenyl)-4,6-dimethoxyindole. Molecular mechanics calculations predict a torsional barrier to inter-ring twist of 6.3 kcal
这里报道的苯并噻唑衍生物与已知结合雌激素受体的2-苯基吲哚衍生物具有结构相似性。我们报告了5,6-二甲氧基-2-(4-甲氧基苯基)-苯并噻唑的合成及其三维晶体结构的测定。晶体是单斜晶体,空间群P 2 1 / c,a = 17.142(1),b = 11.165(1),c = 7.683(2)Å,β= 101.34(1)°。2307反射被细化为R = 0.039。环间扭曲角为21°,大于2-(邻-羟基苯基)苯并噻唑中的扭曲角,但与2-(4'-溴苯基)-4,6-二甲氧基吲哚中的相似。分子力学计算预测对环间扭曲的扭转势垒为6.3 kcal mol -1用于未取代的苯并噻唑。分子轨道计算表明,尽管氢键可以使取代的苯并噻唑具有稳定性,但更多的非氢键取代基可以带来更大的稳定性。