sec-butyllithium. Quenching with a range of electrophiles yields functionalised aryl ureas in excellent yield. Lateral lithiation is favoured when the urea nitrogen adjacent to the aromatic ring in question is alkylated, and when competitive lithiations of such a ring are possible, lateral lithiation is more favourable than the alternative ortholithiation.
带有N-(2-烷基芳基)基团的芳族
脲可通过用
仲丁基锂处理而横向
锂化。用一系列亲电试剂猝灭可以以优异的产率产生官能化的芳基
脲。当与所讨论的芳族环相邻的
尿素氮被烷基化时,侧向
锂化是有利的,并且当这种环的竞争性
锂化是可能的时,侧向
锂化比替代的原位
锂化更有利。