作者:Premji Patel、John A. Joule
DOI:10.1039/c39850001021
日期:——
Lithiation of 1-methyl-4-pyridone with n-butyl-lithium at -78 °C proceeds smoothly at the C-2 position and 2-substituted-4-pyridones (1c–j) are obtained by subsequent reaction with electorphiles; lithiation of 1-methyl-2-pyridone takes place predominantly at the N-methyl, the lithio-derivative reacting rapidly, even at -78 °C with starting pyridone to give a dimer, (3).
1-甲基-4-吡啶酮与正丁基锂在-78°C处在C-2位置顺利进行,随后与亲电子试剂反应,可制得2-取代的4-吡啶酮(1c–j)。1-甲基-2-吡啶酮的锂基化主要发生在N-甲基上,即使在-78°C时,巯基衍生物也迅速与起始吡啶酮反应生成二聚体(3)。