Application of the Reich iodoso syn-elimination for the preparation of an intermediate appropriate for the synthesis of both hexacyclic steroidal units of cephalostatin 7
作者:Seongkon Kim、P.L. Fuchs
DOI:10.1016/0040-4039(94)85350-9
日期:1994.9
Hecogenin acetate 5 was converted to an intermediate suitable for construction of both “North” and “South” hexacyclic spiroketals present in cephalostatin 7. The key chemical transformations involved are: (1) the Reich iodoso syn-elimination of iodide 18; (2) Rhodium [II] catalyzed intermolecular oxygen alkylation of secondary neopentyl alcohol 21; and (3) Intramolecular Wadsworth-Emmons reaction to