(1S,4aS,7R,7aS)-4'-[(1S)-1-acetyloxyethyl]-5'-oxo-1-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyspiro[4a,7a-dihydro-1H-cyclopenta[c]pyran-7,2'-furan]-4-carboxylic acid 、
十二烷基伯胺 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以37%的产率得到[(2R,3R,4S,5R,6S)-6-[(1S,4aS,7R,7aS)-4'-[(1S)-1-acetyloxyethyl]-4-(dodecylcarbamoyl)-5'-oxospiro[4a,7a-dihydro-1H-cyclopenta[c]pyran-7,2'-furan]-1-yl]oxy-3,4,5-triacetyloxyoxan-2-yl]methyl acetate