9H-fluoren-9-ylmethyl (1'R,2R,2'S,3R,3aS,6S,7aR,10'S,11'R,14'S)-14'-hydroxy-3,6,6',11'-tetramethylspiro[3,3a,5,6,7,7a-hexahydrofuro[3,2-b]pyridine-2,5'-pentacyclo[8.8.0.02,8.06,8.011,16]octadec-16-ene]-4-carboxylate 在
二乙胺 作用下,
以
二氯甲烷 为溶剂,
以95%的产率得到(1'R,2R,2'S,3R,3aS,6S,7aR,10'S,11'R,14'S)-3,6,6',11'-tetramethylspiro[3a,4,5,6,7,7a-hexahydro-3H-furo[3,2-b]pyridine-2,5'-pentacyclo[8.8.0.02,8.06,8.011,16]octadec-16-ene]-14'-ol