A number of previously undescribed derivatives of 2-amino-5-(2-aryl-2-oxoethyl)thiazol-4(5H)-one containing electron-donating substituents in the aromatic ring were synthesized by the reaction of (E)-4-aryl-4-oxobut-2-enoic acids with thiourea. Reduction of the reaction products with NaBH₄ yielded diastereomeric alcohols, whereas bromination in AcOH was accompanied by elimination of HBr and the formation of (Z)-2-amino-5-(2-aryl-2-oxoethylidene)thiazol-4(5H)-ones.

中文翻译：

---

4-芳基-4-氧代丁-2-烯酸与硫脲反应的合成，结构研究和产物改性

通过（E）-的反应，合成了许多先前未描述的2-氨基-5-（2-芳基-2-氧代乙基）噻唑-4（5H）-在芳族环中含有给电子取代基的衍生物。4-芳基-4-氧代丁-2-烯酸与硫脲。用NaBH ₄还原反应产物可生成非对映异构醇，而在AcOH中溴化则伴随着HBr的消除和（Z）-2-氨基-5-（2-芳基-2-氧代亚乙基）噻唑-4（5）的形成。H）-一个。