反式-桂皮酸酐 、
3-oxo-27-hydroxy-28-desmethylolean-12-ene 在
吡啶 作用下,
反应 72.0h,
以66%的产率得到(E)-3-Phenyl-acrylic acid (4aR,6aR,6bR,8aR,12aR,12bR,14bR)-2,2,6b,9,9,12a-hexamethyl-10-oxo-2,3,4,4a,5,6,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-octadecahydro-1H-picen-6a-ylmethyl ester