(N-tert-Butanesulfinyl)imines in Alkaloid Synthesis: Concise Formal Syntheses of the Dendrobate Alkaloid (+)-241D and Its C-4 Epimer¹
作者:Biswanath Das、Kongara Damodar
DOI:10.1055/s-0031-1289634
日期:2012.1
Concise formal syntheses of the dendrobate alkaloid (+)-241D and its C-4 epimer are described by means of a highly diastereoselective Barbier-type indium-mediated allylation strategy involving an (S)-(N-tert-butanesulfinyl)imine. (N-tert-butanesulfinyl)imine - piperidine alkaloids - aldol reaction - alkaloid-241D - allylation Part 50 in the series ‘Synthetic studies on natural products’.
An efficient stereoselective synthesis of dendrobate alkaloid (+)-241D and its C-4 epimer was achieved from the inexpensive, commercially available starting material decanal (10) in an overall yield of 21.9% and 21.1%, respectively. This synthesis utilizes the key steps of Maruoka asymmetric allylation, one-pot epoxidation followed by nucleophilic addition of an organomagnesium reagent (Forsyth’s protocol)