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Synthesis of 2-(2-, 3-, and 4-pyridyl)benzoxazoles by the reaction of phenolic schiff bases with thianthrene cation radical

✍ Scribed by Myeong Soon Park; Koon Ha Park; Kun Jun; Seung Rim Shin; Sea Wha Oh

Book ID
102339942
Publisher
Journal of Heterocyclic Chemistry
Year
2002
Tongue
English
Weight
36 KB
Volume
39
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

2‐(2‐, 3‐, and 4‐Pyridyl)benzoxazole derivatives were prepared in excellent yields by the oxidative cyclization of phenolic Schiff bases with thianthrene cation radical perchlorate in the presence of 2,6‐di‐tert‐butyl‐4‐methylpyridine.

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Ring Transformations of Oxazoles and The
Ring Transformations of Oxazoles and Their Derivatives. – Synthesis of 2,3-Dihydro-2-(2-hydroxyphenylimino)-4-methylthiazoles by Reaction of 2-(2-Oxopropylthio)benzoxazoles with Amines
✍ Kalcheva, Veneta ;Tosheva, Madlena ;Hadjieva, Petia 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 367 KB

## Abstract Treatment of 2‐(2‐oxopropylthio)benzoxazoles 1a–d with an excess of primary amines in acetic acid or in perchloric acid affords 3‐substituted 2‐(2‐hydroxyphenylimino)‐4‐methylthiazoles 4a–q. Interaction of thiazoles 4a,i with diazomethane leads to the corresponding __O__‐methyl derivati