Regiocontrolled Halogen Dance of Bromothiophenes and Bromofurans
作者:Daichi Mari、Naoki Miyagawa、Kentaro Okano、Atsunori Mori
DOI:10.1021/acs.joc.8b02220
日期:2018.11.16
The LDA (lithiumdiisopropylamide)-promoted regiocontrolled halogen dance of α-bromothiophenes and α-bromofurans is described. Bromothiophenes bearing a diethyl acetal moiety undergo selective deprotonation at the β-position adjacent to the bromo group. In contrast, oxazoline, ester, and amide groups act as directing groups in the initial lithiation step to generate a carbanion at the β-position neighboring