Directed<i>ortho</i>-Lithiation of the 2-(<i>N</i>,<i>N</i>-Dimethylhydrazinecarbonyl)-1-methylindole. Efficient Preparation of Tricyclic Lactones
作者:M. D. Pujol、M. Romero
DOI:10.1055/s-2003-36786
日期:——
N-Methyl indole-2-hydrazide 1 was lithiated at the 3-position using t-BuLi in the presence of TMEDA in THF. The generated ortho-lithiated intermediate is reacted with a variety of electrophiles to give regioselectively 2,3-disubstituted indoles in good yields. The hydroxyhydrazides were converted to the corresponding lactones after oxidation with MnO2.
在四氢呋喃中,在 TMEDA 的存在下,使用 t-BuLi 对 N-甲基吲哚-2-酰肼 1 进行 3 位锂化。 生成的正交石硫酸化中间体与多种亲电体反应,以良好的产率得到具有区域选择性的 2,3-二取代吲哚。羟肼在与 MnO2 氧化后转化为相应的内酯。