Stereoselective Total Synthesis of (−)-Spirofungin A by Utilising Hydrogen-Bond Controlled Spiroketalisation
作者:John E. Lynch、Shannon D. Zanatta、Jonathan M. White、Mark A. Rizzacasa
DOI:10.1002/chem.201002501
日期:2011.1.3
The stereoselective total synthesis of the spiroketal containing Streptomyces metabolite (−)‐spirofungin A (1) is described. A key step involved a spiroketalisation controlled by an intramolecular H‐bond which favoured the desired spiroketal 4 (13:1 ratio). The presence of the intramolecular H‐bond in 4 is possibly due to a 1,5‐alkyne–oxygen interaction. Other key steps include an efficient cross‐metathesis