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.