Trapping of Transient Thienyllithiums Generated by Deprotonation of 2,3- or 2,5-Dibromothiophene in a Flow Microreactor
作者:Kentaro Okano、Yoshiki Yamane、Aiichiro Nagaki、Atsunori Mori
DOI:10.1055/s-0040-1706479
日期:2020.12
Selective trapping of (4,5-dibromo-2-thienyl)lithium, known to undergo halogen dance, was achieved in a flow microreactor. This transient thienyllithium, generated by mixing 2,3-dibromothiophene and lithium diisopropylamide at –78 °C for 1.6 seconds, reacted with benzaldehyde. The reaction system is also applicable to other carbonyl compounds to afford the corresponding adducts in good yields. Moreover
(4,5-二溴-2-噻吩基)锂的选择性捕获,已知会发生卤素舞蹈,是在流动微反应器中实现的。这种瞬态噻吩基锂是通过在 –78 °C 下将 2,3-二溴噻吩和二异丙基氨基锂混合 1.6 秒而生成的,它与苯甲醛反应。该反应体系也适用于其他羰基化合物,以良好的收率得到相应的加合物。此外,既定条件允许 2,5-二溴噻吩转化为两种结构异构体的混合物。对比结果根据反应途径进行讨论。