Metallation reactions. XX. regioselective metallation of (alkylthio)methoxybenzenes by superbases versus organolithium compounds
作者:Salvatore Cabiddu、Claudia Fattuoni、Costantino Floris、Gioanna Gelli、Stefana Melis
DOI:10.1016/s0040-4020(01)80413-0
日期:1993.5
(Alkylthio)methoxybenzenes have been metallated using two different metallating agents. The results show that sometimes superbases and butyllithium do not functionalize the same sites. Superbases monometallate the thiomethylic carbon of meta and para (methylthio)methoxybenzenes. The same substrates on the other hand are metallated by butyllithium in ortho to the methoxy group. One-step dimetallation
(烷硫基)甲氧基苯已经使用两种不同的金属化剂金属化。结果表明,有时超碱和丁基锂不能官能化相同的位点。超碱单金属化间和对(甲硫基)甲氧基苯的硫代甲基碳。另一方面,相同的底物被丁基锂邻位甲氧基金属化。一步法与dimetallation要么超强碱进行,或者在thiomethylic碳和在芳基碳发生丁基锂邻于甲氧基。对位异构体(1c)与超碱的两个连续的一锅单金属化发生在硫代甲基碳和环状碳上甲氧基的邻位,按此顺序。用丁基锂类似的方法将两个邻位金属化成甲氧基。(乙硫基)衍生物(1d)的单金属化产生使用超碱或丁基锂在甲氧基上邻位取代的产物。该化合物的Dimetallation总是取代的氢邻到甲氧基和thiomethylenic氢。