Lithiation and Substitution of N′-(ω-Phenylalkyl)-N,N-dimethylureas
作者:Keith Smith、Gamal El-Hiti、Mohammed Alshammari
DOI:10.1055/s-0031-1291008
日期:2012.7
give the corresponding substituted derivatives in excellent yields. Lithiation of N′-(3-phenylpropyl)-N,N-dimethylurea takes place on the α-CH2 with tert-butyllithium at 0 °C. On the other hand, lithiation of N′-(4-phenylbutyl)-N,N-dimethylurea with tert-butyllithium at 0 °C takes place on one of the methyl groups of the urea unit. Lithiation of N′-phenethyl-N,N-dimethylurea with three equivalents