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
不同地官能化dihalomethyllithiums(LiCHBrCl,LiCHClI,LiCHBrI,LiCHCl的选择性转移2,LiCHBr 2,LiCHFI)到的Weinreb酰胺用于制备偕报道于一种合成操作dihaloketones。这些酰胺作为酰化剂的能力以及二卤代甲烷作为亲核试剂的广泛应用,使得在完全化学控制下可以直接制备标题化合物。在光学活性材料的情况下,没有外消旋现象被证明。另外,一致地注意到对敏感官能团(酯,酰胺,卤素,烯烃等)的耐受性,因此使该概念上直观的策略对操作者而言是灵活和可调的。