Heterocyclic tautomerism: reassignment of two crystal structures of 2-amino-1,3-thiazolidin-4-one derivatives
作者:Andrzej K. Gzella、Marcin Kowiel、Aneta Suseł、Magdalena N. Wojtyra、Roman Lesyk
DOI:10.1107/s2053229614015162
日期:2014.8.15
thiazolidin‐4‐one fragment takes up two alternative locations in the crystal structure, which allows the molecule to adopt R and S configurations. The occupancy factors of the disordered atoms are 0.883 (2) (for the R configuration) and 0.117 (2) (for the S configuration). In (I), the main factor that determines the crystal packing is a system of hydrogen bonds, involving both strong N—H...N and O—H
5-(2-羟乙基)-2-[(吡啶-2-基)氨基] -1,3-噻唑烷-1-酮,C 10 H 11 N 3 O 2 S,(I)和乙基的结构4-[((4-氧代-1,3-噻唑烷-2-基)氨基]苯甲酸酯,C 12 H 12 N 2 O 3 S,(II),与编号为GACXOZ的条目相同[Váňa等。(2009)。J.杂环。化学 46,635-639]和HEGLUC [Behbehani&易卜拉欣(2012)。分子,17,6362-6385],分别在剑桥结构数据库[艾伦(2002)。Acta Cryst。B 58(380–388),已在130 K下重新确定。该结构研究表明,所研究的两种化合物均以其互变异构体的形式存在,其互变异构体在五元杂环中带有羰基亚胺基,并且具有环外胺N原子,与先前报道的具有仲酰胺基和环外亚胺N原子的互变异构体相比。所研究的两种化合物的物理化学和光谱数据分别与GACXOZ和HEGLU
Efficient synthesis of 5-(2-hydroxyethyl)-2-phenylimino- 1,3-thiazolidin-4-ones and 5-(2-hydroxyethyl)-2-phenylamino-4,5-dihydro-1,3-thiazol-4-ones
A new method for the synthesis of substituted 5-(2-hydroxyethyl)-2-phenylimino-1,3-thiazolidin-4-ones and 5-(2-hydroxyethyl)-2-phenylamino-4,5-dihydro-1,3-thiazol-4-ones is described, starting from phenylthioureas and 3-bromotetrahydrofuran-2-one. The reaction proceeds under mild conditions, is very simple to perform, and is applicable to a relatively wide range of substituents in benzene nucleus.