乙酸酐 、
methyl (1S,4aS,7R,7aS)-7-(hydroxymethyl)-1-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-4-carboxylate 在
吡啶 作用下,
以88%的产率得到methyl (1S,4aS,7R,7aS)-7-(acetyloxymethyl)-1-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-4-carboxylate