(2E,4E,7R)-8-[(2R)-2-[(2R,3S,5S,6E,8S,9S,11R,12E,14S,15S,16R,17S,18S)-15-hydroxy-3,5,9,11,17-pentamethoxy-8,14,16,18-tetramethyl-19-tri(propan-2-yl)silyloxynonadeca-6,12-dien-2-yl]-6-oxo-2,3-dihydropyran-4-yl]-7-methoxy-5-methylocta-2,4-dienoic acid 在
三乙胺 、
4-二甲氨基吡啶 作用下,
以
甲苯 为溶剂,
以32%的产率得到(3R,5E,7E,11S,12S,13E,15R,17S,18S,19E,21S,23S,24R,25R)-3,15,17,21,23-pentamethoxy-11-[(2S,3S,4S)-3-methoxy-4-methyl-5-tri(propan-2-yl)silyloxypentan-2-yl]-5,12,18,24-tetramethyl-10,26-dioxabicyclo[23.3.1]nonacosa-1(28),5,7,13,19-pentaene-9,27-dione