(1S,3R,5R,7S,11S,12S,13E,15R,17R)-5-hydroxy-12,15-dimethyl-11-[(1E,3Z)-octa-1,3-dienyl]-10,21,22-trioxatricyclo[15.3.1.13,7]docos-13-en-9-one 、
乙酸酐 以
吡啶 为溶剂,
以93%的产率得到[(1S,3S,5R,7S,11S,12S,13E,15R,17R)-12,15-dimethyl-11-[(1E,3Z)-octa-1,3-dienyl]-9-oxo-10,21,22-trioxatricyclo[15.3.1.13,7]docos-13-en-5-yl] acetate