Ni-Catalyzed Reductive Coupling of Alkyl Acids with Unactivated <i>Tertiary</i> Alkyl and Glycosyl Halides
作者:Chenglong Zhao、Xiao Jia、Xuan Wang、Hegui Gong
DOI:10.1021/ja510653n
日期:2014.12.17
highlights Ni-catalyzed reductivecoupling of alkyl acids with alkyl halides, particularly sterically hindered unactivated tertiary alkyl bromides for the production of all carbon quaternary ketones. The reductive strategy is applicable to α-selective synthesis of saturated, fully oxygenated C-acyl glycosides through easy manipulations of the readily available sugar bromides and alkyl acids, avoiding otherwise
An efficient pinacol rearrangment mediated by trimethyl orthoformate has been developed. The reactions of various types of diols with catalytic amount of a Lewis acid in the presence of an orthoester afforded the rearranged product in good yields via a cyclic orthoester intermediate.
The Catalytic Pinacol Rearrangement of 1,2-Diols Using an Antimony(V) Salt.
作者:Tsunehiro Harada、Teruaki Mukaiyama
DOI:10.1246/cl.1992.81
日期:——
In the presence of a catalytic amount of antimony(V) chloride or antimony(V) salt generated from antimony(V) chloride and silver hexafluoroantimonate, the pinacol rearrangement of several 1,2-diols or their trimethylsilyl ethers proceeds smoothly to give the corresponding ketones in good yields.