(2R,3S)-3-(acetyloxy)-3-[(3R,4R,6R)-4,6-bis(acetyloxy)-6-{[1-cyclohexyl(cyclohexylcarbamoyl)amino]carbonyl}-3-acetamidooxan-2-yl]-2-(prop-1-en-2-yloxy)propyl acetate 在
三氟化硼乙醚 作用下,
以
1,4-二氧六环 为溶剂,
以77%的产率得到(5R,7R,8R,9S)-8-acetamido-9-acetoxy-7-[((1S,2R)-1,2,3-triacetoxy)propyl]-1,3-dicyclohexyl-6-oxa-1,3-diazaspiro[4.5]decane-2,4-dione