A new method for the preparation of 2-alkoxybenzoxazoles.
作者:MASATOSHI YAMATO、YASUO TAKEUCHI、KYOKO HATTORI、KUNIKO HASHIGAKI
DOI:10.1248/cpb.31.3946
日期:——
A one-pot synthesis of 2-alkoxybenzoxazole (I) from benzoxazoline-2-thione (II) was achieved. Treatment of benzoxazoline-2-thione with methyl iodide followed by an alcohol at room temperature in the presence of sodium hydride gave I. The reaction involves the intermediate of 2-(methylthio) benzoxazole (IIIa), followed by substitution of the methylthio group by an alkoxide anion. The general applicability of this method is discussed.
一种从苯并噁唑-2-硫酮(II)合成2-烷氧基苯并噁唑(I)的单锅合成法得以实现。将在室温下用碘甲烷处理苯并噁唑-2-硫酮,然后在氢化钠存在下加入醇,可以得到I。该反应涉及中间体2-(甲硫基)苯并噁唑(IIIa),随后通过烷氧负离子取代甲硫基。讨论了该方法的普遍适用性。