Modular and Chemoselective Strategy for Accessing (Distinct) α,α‐Dihaloketones from Weinreb Amides and Dihalomethyllithiums
作者:Saad Touqeer、Raffaele Senatore、Monika Malik、Ernst Urban、Vittorio Pace
DOI:10.1002/adsc.202001106
日期:2020.11.18
The selective transfer of diversely functionalized dihalomethyllithiums (LiCHBrCl, LiCHClI, LiCHBrI, LiCHCl2, LiCHBr2, LiCHFI) to Weinreb amides for preparing gem‐dihaloketones in one synthetic operation is reported. The capability of these amides as acylating agents and, the wide availability of dihalomethanes as pronucleophiles, enable a straightforward route to the title compounds under full chemocontrol
An efficient and convenientsynthesis for mono-fluoroalkyl reagents α-halo-α-fluoroketones, including α-iodo-α-fluoroketones, α-bromo-α-fluoroketones and α-chloro-α-fluoroketones was reported by using the Wu–Colby's protocol involving the release of trifluoroacetate.
A mild and efficient one-pot method has been developed for the synthesis of oxime ether derivatives with up to 85% yield by employing tert-butyl nitrite (TBN) as nitrogen source, which occurs under room temperature and exhibits wide substrate scope. The single electron transfer mechanism and the cascade reactions approach have been confirmed.