The totalsynthesis of (+)-epiquinamide and (−)-epiepiquinamide has been achieved starting from a 3,5-dihydroxyfuranoside synthon derived from d-mannose. The methods featured Bernet-Vasella reaction followed by Horner-Wadsworth-Emmons (HWE) reaction to provide a new chiral building block diene as the key steps. The bicyclic framework of this quinolizidine was constructed by using ring-closing metathesis
作者:Marloes A. Wijdeven、Peter N. M. Botman、Roel Wijtmans、Hans E. Schoemaker、Floris P. J. T. Rutjes、Richard H. Blaauw
DOI:10.1021/ol0515715
日期:2005.9.1
The stereoselective total synthesis of the novel quinolizidine alkaloid (+)-epiquinamide is presented, starting from the amino acid l-allysine ethylene acetal. Key steps in the synthesis involved a highly diastereoselective N-acyliminium ion allylation and a ring-closing metathesis reaction to provide the bicyclic skeleton. [reaction: see text]
Total synthesis of (+)-epiquinamide from d-mannitol
作者:Subhash Ghosh、J. Shashidhar
DOI:10.1016/j.tetlet.2008.11.115
日期:2009.3
The total synthesis of (+)-epiquinamide, a novel quinolizidine alkaloid isolated from the Ecuadoran poison frog, Epipedobates tricolor is described. The key step includes a ring-closing metathesis reaction to construct both the six member rings. d-Mannitol was used as a chiral pool material.