The external quenching method based on flowmicroreactors allows the generation and use of short‐lived fluoro‐substituted methyllithium reagents, such as fluoromethyllithium, fluoroiodomethyllithium, and fluoroiodostannylmethyllithium. Highly chemoselective reactions have been developed, opening new opportunities in the synthesis of fluorinated molecules using fluorinated organometallics.
Modular and Chemoselective Strategy for the Direct Access to α-Fluoroepoxides and Aziridines via the Addition of Fluoroiodomethyllithium to Carbonyl-Like Compounds
作者:Serena Monticelli、Marco Colella、Veronica Pillari、Arianna Tota、Thierry Langer、Wolfgang Holzer、Leonardo Degennaro、Renzo Luisi、Vittorio Pace
DOI:10.1021/acs.orglett.8b04001
日期:2019.1.18
An expeditious, high-yieldingsynthesis of rare α-fluoroepoxides and α-fluoroaziridines through the addition of the unkown fluoroiodomethyllithium (LiCHIF)—formed via deprotonation the commercially available fluoroiodomethane with a lithium amide base—to carbonyl-like compounds is documented. The ring-closure reactions, leading to α-fluorinated three-membered heterocycles, rely on the diversely reactive
The Pd-cataylsed direct ortho-C(sp2)–H fluorination of aromatic ketones has been developed for the first time. The reaction features good regioselectivity and simple operations, constituting an alternative shortcut to access fluorinated ketones. A concise synthesis of anacetrapib has also been achieved by using late-stage C–H fluorination as a key step.