Synthesis of structurally diverse diarylketones through the diarylmethyl sp3 CH oxidation
摘要:
Under open-flask conditions, an efficient method to assemble a series of diversely functionalized diarylketones in the presence of commercially available NBS has been developed. Yields of up to 99% have been achieved employing diarylmethanes as starting material. Based on O-18-labeled experiment, the addition of stoichiometric water eventually leads to excellent yields in all carbonylation cases. (C) 2014 Elsevier Ltd. All rights reserved.
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 flowmicroreactor. 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。