A new finding in selective Baeyer–Villiger oxidation of α-fluorinated ketones; a new and practical route for the synthesis of α-fluorinated esters
作者:Satoru Kobayashi、Hiroaki Tanaka、Hideki Amii、Kenji Uneyama
DOI:10.1016/s0040-4020(03)00047-4
日期:2003.2
α-fluorinated ketones with m-chloroperbenzoic acid (m-CPBA) under mild conditions. The yield of the esters was influenced by the choice of solvent, base, and substituent on the aryl group of the ketones. 4-Methoxyphenyl substituted fluoroketones were oxidized almost quantitatively with m-CPBA within 10 min to 12 h at room temperature using 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a cosolvent with CH2Cl2
被有效地用α-氟化酮的拜尔-维利格氧化制备α-氟化酯米氯过苯甲酸(米温和条件下-CPBA)。酯的产率受酮的芳基上的溶剂,碱和取代基的选择影响。在室温下,使用1,1,1,3,3,3-六氟-2-丙醇(HFIP)与CH 2 Cl作为助溶剂,在10分钟至12小时内,用m -CPBA几乎定量地氧化了4-甲氧基苯基取代的氟代酮。2(1:1,v / v)和水性缓冲液(KH 2 PO 4-NaOH,pH 7.6)作为添加剂。α-氟代酮的氧化反应速率高于相应的非氟代酮的氧化反应速率。氟甲基芳基酮的α位上的氟原子增强了Baeyer-Villiger氧化反应的活性。