A Simple Synthesis of 1-Acyl-3-aryl-3<i>H</i>-pyrrolo[2′,3′:4,5]pyrimido[6,1-<i>b</i>]benzothiazol-6-ium-2-olates: Betainic Derivatives of a Novel Heterocyclic System
作者:Anton V. Tverdokhlebov、Elizaveta V. Resnyanskaya、Yulian M. Volovenko、Oleg V. Shishkin、Roman I. Zubatyuk
DOI:10.1055/s-2002-35992
日期:——
The title compounds were obtained by acylation of 5-amino-1-aryl-4-(2-benzothiazolyl)-2,3-dihydro-2-pyrrolones with 3-fold excess of acid chlorides. Starting pyrrolones were prepared in high yields by alkylation of 2-benzothiazoleacetonitrile with chloroacetic acid anilides. An X-ray crystallographic study of 1-benzoyl-3,5-diphenyl-3H-pyrrolo[2′,3′:4,5]pyrimido[6,1-b]benzothiazole-6-ium-2-olate was carried out to confirm the structure of title compounds unambiguously. The charge distribution in the obtained betaines was discussed.
标题化合物通过用3倍摩尔过量的酸氯化物对5-氨基-1-芳基-4-(2-苯并噻唑基)-2,3-二氢-2-吡咯酮进行酰化反应获得。起始的吡咯酮通过与氯乙酸苯胺的烷基化反应高产量地制备。对1-苯甲酰基-3,5-二苯基-3H-吡咯[2′,3′:4,5]嘧啶并[6,1-b]苯并噻唑-6-铵-2-氧化物的X射线晶体学研究被进行,以明确验证标题化合物的结构。讨论了所获得的季铵盐中的电荷分布。