Electrophilic Fluorinating Reagent Mediated Synthesis of Fluorinated α-Keto Ethers, Benzil, and 6,6‘-Dialkoxy-2,2‘-bipyridines
作者:Sudha Manandhar、Rajendra P. Singh、Gary V. Eggers、Jean'ne M. Shreeve
DOI:10.1021/jo0258554
日期:2002.9.1
regioselectively, in excellent isolated yields. On the other hand, fluorinated alcohols did not react with MEC-31. Reaction of MEC-31 with an excess of diethylene glycol (7) gave the bipyridine derivative (8) in 88% isolated yield. Reaction of 8 either with diethylaminosulfur trifluoride (DAST) or bis(2-methoxyethyl)aminosulfur trifluoride (Deoxofluor) readily produced the corresponding difluoro derivative
研究了在亲电子试剂存在下各种氟化和非氟化醇与反式二苯乙烯的相互作用。在纯净条件下,反式二苯乙烯(1)与氟化醇R(f)OH(R(f)= CF3CH2-,CFH2CH2-,CF3CF2CH2-,CF2H(CF2)3CH2-,(CF3)2CH-,( CF3)3C-(2a-f)在亲电子试剂,1-(氯甲基)-4-氟-1,4-二氮杂双环[2.2.2]辛烷双(四氟硼酸酯)(Selectfluor)或N,N-二氟-2,2'-联吡啶双(四氟硼酸酯)(MEC-31)得到的α-酮醚(3a-f)和苯甲腈(4)的产率中等至中等,α-酮醚和苯甲醚的形成非常依赖在反应时间,醇的氟化程度以及是否使用诸如CH3CN,DMF或DMA等溶剂方面,在溶液中均未形成α-酮醚和苯甲醚。在纯净条件下,非氟化醇ROH(R = CH3-,CH3CH2-,CH3CH2CH2-,CH3CH2CH2CH2-,CH3CH2CH2CH2CH2C