Oxidative cleavage of aryl oxazolines using methyl(trifluoromethyl)dioxirane generated in situ
作者:Dan Yang、Yiu-Chung Yip、Xue-Chao Wang
DOI:10.1016/s0040-4039(97)01654-7
日期:1997.10
Oxidative cleavage of aryl oxazoline 2 using methyl(trifluoromethyl)dioxirane 1a generated in situ provides the intermediate nitro-ester 8, which undergoes a basic hydrolysis to furnish benzoic acid 11. Even the hindered oxazoline 7 can be cleaved smoothly to afford 3,3′-dimethyl-2,2′-diphenic acid 16. All substituted benzoic acids 11–16 can be isolated in excellent yields (80–95 %).
使用原位生成的甲基(三氟甲基)二环氧乙烷1a对芳基恶唑啉2进行氧化裂解,可得到中间体硝基酯8,该中间体经过碱性水解以提供苯甲酸11。甚至受阻的恶唑啉7也可以平滑地裂解,得到3,3'-二甲基-2,2'-二苯甲酸16。所有取代的苯甲酸11-16都可以优良的产率(80-95%)分离出来。