Regioselective lithiation of 1‐benzylpyrazole derivatives: Synthesis of amides derived from pyrazole
作者:Agnieszka Górska、Tomasz Kliś、Janusz Serwatowski
DOI:10.1002/aoc.4027
日期:2018.2
A series of brominated 1‐benzylpyrazoles were deprotonated at the pyrazole 5‐position or the benzylic position on treatment with lithium diisopropylamide in tetrahydrofuran at low temperature. The obtained organolithium intermediates were subjected to reaction with Me3SiCl, t‐BuNCO, ClCONEt2 or ClCON(i‐Pr)2 affording the respective silanes or amides after hydrolysis.
在低温下用二异丙基氨基锂在四氢呋喃中处理,将一系列溴化的1-苄基吡唑在吡唑5位或苄基位置去质子化。将获得的有机锂中间体与Me 3 SiCl,t- BuNCO,ClCONEt 2或ClCON(i- Pr)2反应,水解后得到相应的硅烷或酰胺。