Variation in the Site of Lithiation of 2-(2-Methylphenyl)ethanamine Derivatives
作者:Keith Smith、Gamal A. El-Hiti、Mohammed B. Alshammari
DOI:10.1021/jo3023445
日期:2012.12.21
Unexpectedly, lithiation of N′-(2-(2-methylphenyl)ethyl)-N,N-dimethylurea with 3 equiv of n-butyllithium in anhydrous THF at 0 °C takes place on the nitrogen and on the CH2 next to the 2-methylphenyl ring (α-lithiation). The lithium reagent thus obtained reacts with various electrophiles to give the corresponding substituted derivatives in excellent yields. Similarly, lithiation of N-(2-(2-methylphenyl)ethyl)pivalamide