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
Synthesis and Comparative Analysis of Molecular and Supramolecular Structures of 4,8-Disubstituted 1,5-Dichloro-2,6-dioxotricyclo[5.1.0.0 3,5 ]octanes
作者:Aidar T. Gubaidullin、Vakhid A. Mamedov、Igor A. Litvinov、Huan Ye、Sadao Tsuboi
DOI:10.1007/s00706-003-0028-y
日期:2003.9.1
A series of 4,8-disubstituted 1,5-dichloro-2,6-dioxotricyclo-[5.1.0.0(3.5)] octanes, synthesized by various methods, were studied by X-ray single crystal diffraction. The conformation (syn/anti) of the molecules does not depend on the method of preparation and nature of substituents. All the compounds crystallize in centrosymmetric space groups with half of the molecules in the asymmetric part of the unit cell. The main influence which the substituents render is on the packing of molecules in crystals and on the types of intermolecular interactions and supramolecular structures.