24,33-bis-OTBDMS-ascomycin 在
咪唑 、 triphenylphospine diiodide 作用下,
以
乙腈 为溶剂,
反应 15.0h,
以37%的产率得到(1R,10S,13S,14S,15S,18R,19E,22S,24S,25R,26S)-15-[tert-butyl(dimethyl)silyl]oxy-13-[(E)-1-[(1R,3R,4R)-4-[tert-butyl(dimethyl)silyl]oxy-3-methoxycyclohexyl]prop-1-en-2-yl]-18-ethyl-24,26-dimethoxy-1,14,20,22-tetramethyl-12,28-dioxa-5-azatricyclo[23.2.1.05,10]octacos-19-ene-2,4,11,17-tetrone