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Chemistry of Modified Flavonoids. Part 24. Synthesis of 4-Aryloxy-3-(2-hydroxy-4-hydroxy/alkoxyphenyl)pyrazoles.

✍ Scribed by V. V. Arkhipov; M. M. Garazd; M. N. Smirnov; V. P. Khilya

Book ID
101964268
Publisher
John Wiley and Sons
Year
2004
Weight
16 KB
Volume
35
Category
Article
ISSN
0931-7597

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Hantzsch reaction of 3-(2-bromoacetyl)-4-hydroxy-chromen-2-one. Synthesis of 3-(thiazol-4-yl)-4-hydroxy coumarines
✍ S. Sukdolak; S. Solujić; N. Manojlović; N. Vuković; L. J. Krstić 📂 Article 📅 2004 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 143 KB

## Abstract 3‐Acetyl‐4‐hydroxy‐chromen‐2‐one (**1**) was brominated with phenyltrimethylammonium tribromide to afford 3‐(2‐bromoacetyl)‐4‐hydroxy‐chromen‐2‐one (**2**) whose reactions with thiourea, thioacetamide and ammonium dithiocarbamate gave respectively 3‐(2‐amino‐thiazol‐4‐yl)‐4‐hydroxy‐, 4‐