Heterogeneous Reductive Isomerization Reaction Using Catalytic Pd/C and H<sub>2</sub>
作者:Daniel D. Caspi、Neil K. Garg、Brian M. Stoltz
DOI:10.1021/ol050952f
日期:2005.6.1
[reaction: see text] A highly selective catalytic reductive isomerization reaction is described. The extremely mild and neutral reaction conditions (10% Pd/C, H2, and MeOH at 0 degrees C) tolerate a wide range of functional groups and generally result in excellent yields. Mechanistic studies suggest that this reaction does not proceed via a stepwise reduction/elimination sequence or a pi-allylpalladium
The first totalsynthesis of (+)-dragmacidin F hasbeen accomplished, establishing the absolute configuration of this biologically important, antiviral marine alkaloid. The convergentroute described features a palladium-mediated oxidative pyrrole carbocylization reaction to construct the [3.3.1] bicycle, as well as a highly selective Suzuki coupling to build the carbon skeleton of the natural product
Development of an Enantiodivergent Strategy for the Total Synthesis of (+)- and (−)-Dragmacidin F from a Single Enantiomer of Quinic Acid
作者:Neil K. Garg、Daniel D. Caspi、Brian M. Stoltz
DOI:10.1021/ja050586v
日期:2005.4.1
An enantiodivergent strategy for the total chemical synthesis of both (+)- and (-)-dragmacidin F beginning from a singleenantiomer of quinic acid has been developed and successfully implemented. Although unique, the synthetic routes to these antipodes share a number of key features, including novel reductive isomerization reactions, Pd(II)-mediated oxidative carbocyclization reactions, halogen-selective