A Convenient Method for the Regioselective Synthesis of 4-Alkyl(aryl)pyridines Using Pyridinium Salts
作者:Kin-ya Akiba、Y\={u}ji Iseki、Makoto Wada
DOI:10.1246/bcsj.57.1994
日期:1984.7
(81–94%). The dihydropyridines were oxidized by oxygen to give 4-alkyl(aryl)pyridines (38–68%). Grignard reagents also reacted with 1-t-butyldimethylsilylpyridinium triflate with almost complete regioselectivity (>99%) to afford the corresponding 1,4-dihydropyridines, which were easily oxidized by oxygen to give 4-substituted pyridines in higher yields than above (58–70%).
RCu·BF3 与1-乙氧基羰基氯化吡啶在4-位反应,几乎完全区域选择性(>99%),以高产率(81-94%)得到相应的1,4-二氢吡啶衍生物。二氢吡啶被氧氧化得到4-烷基(芳基)吡啶(38-68%)。格氏试剂还与 1-叔丁基二甲基甲硅烷基吡啶鎓三氟甲磺酸盐反应,以几乎完全的区域选择性(>99%)得到相应的 1,4-二氢吡啶,它们很容易被氧气氧化得到 4-取代的吡啶,产率高于上述(58- 70%)。