乙酸酐 、
3-O-[β-D-glucopyranosyl-(1->2)-β-D-xylopyranosyl]phytolaccinic acid 在
吡啶 作用下,
反应 16.0h,
以28 mg的产率得到(2S,4aR,6aR,6aS,6bR,8aR,9R,10S,12aR,14bS)-9-(acetyloxymethyl)-10-[(2S,3R,4S,5R)-4,5-diacetyloxy-3-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2-methoxycarbonyl-2,6a,6b,9,12a-pentamethyl-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylic acid