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)= -,CFH2 -,
CF3CF2CH2-,
CF2H(
CF2)3 -,( )2CH-,( )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)(Sel
ECtfluor)或N,N-二
氟-
2,2'-联吡啶双(四
氟硼酸酯)(M
EC-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 CN,
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-, -, -, -, C