Convenient One-Pot Synthesis of 2,5-Disubstituted Oxazoles via a Catalytic Oxidative Dehydrogenation of F<sub>3</sub>CSO<sub>3</sub>H·SiO<sub>2</sub>-DDQ/CuCl<sub>2</sub>/LiCl
作者:Shizhen Yuan、Zhen Li、Ling Xu
DOI:10.1002/jhet.1637
日期:2013.11
A facile one‐pot synthesis of 2,5‐disubstituted oxazoles was developed via cyclization of aldoximes and phenylacetylene then dehydrogenation oxidation. 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone was studied for the selective oxidation of oxazolines using Cu2+/Li+ as catalyst and O2 as indirect oxidant. The reaction results showed that this catalyst system can effectively catalyze the oxidation of oxazolines
通过醛肟和苯乙炔的环化然后脱氢氧化制得了一种简便的一锅合成2,5-二取代的恶唑。以Cu 2+ / Li +为催化剂,O 2为间接氧化剂,研究了2,3-二氯-5,6-二氰基-1,4-苯醌对氧化唑啉的选择性氧化。反应结果表明,该催化剂体系可有效催化恶唑啉氧化为相应的恶唑。因此,通过2,3-二氯-5,6-二氰基-1,4-苯醌/ CuCl 2 / LiCl / O 2的催化氧化,很容易以高收率合成各种多取代的恶唑。