Syntheses and biological activities of 13-substituted avermectin aglycons
作者:Helmut Mrozik、Bruce O. Linn、Philip Eskola、Aino Lusi、Alexander Matzuk、Franz A. Preiser、Dan A. Ostlind、James M. Schaeffer、Michael H. Fisher
DOI:10.1021/jm00122a015
日期:1989.2
beta-iodide gave, upon elimination with lutidine, the 8(9),10(11),12(13),14(15)-tetraene. The 13 beta-alcohol and the rearranged 15-ol 13(14)-ene and 15-amino 13(14)-ene derivatives were obtained by substitution via the allylic carboniumion. MEM ethers 11 and 12 of the two epimeric 13-ols were prepared by alkylation with MEM chloride. In contrast, methylation of 1a with MeI and Ag2O in CH2Cl2 occurred exclusively