Stereoselective synthesis of pachastrissamine (jaspine B)
作者:Celia Ribes、Eva Falomir、Miguel Carda、J.A. Marco
DOI:10.1016/j.tet.2006.03.073
日期:2006.6
A stereoselective synthesis in enantiopure form of the natural anhydrophytosphingosine pachastrissamine (jaspine B), a metabolite isolated from sponges, is described. The chiral epoxide (R)-glycidol was the starting material. Key steps of this synthesis are a Sharpless asymmetric epoxidation, an intramolecular stereospecific epoxide opening mediated by a trichloroacetimidate group, and the formation
A general, efficient and stereospecific route to sphingosine, sphinganines, phytosphingosines and their analogs
作者:Ye Cai、Chang-Chun Ling、David R. Bundle
DOI:10.1039/b516333a
日期:——
Sphingosine, sphinganines and phytosphingosines and their analogs were synthesized by an aldol condensation between an iminoglycinate bearing a (+)-(1R,2R,5R)-2-hydroxy-3-pinanone group as chiral auxiliary and an appropriate aldehyde. All condensations proceeded with excellent enantioselectivity to generate the (2S,3R)-D-erythro structures in good yields.