acetic acid 4,5-diacetoxy-6-acetoxymethyl-2-[7-benzyloxy-2,2-dimethyl-6-(2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethoxy)-tetrahydro-[1,3]dioxolo[4,5-c]pyran-4-ylmethoxy]-tetrahydro-pyran-3-yl ester 在
sodium methylate 作用下,
反应 3.0h,
以92%的产率得到(2R,3R,4S,5R,6R)-2-[[(3aS,4R,6R,7R,7aS)-2,2-dimethyl-7-phenylmethoxy-6-[[(1S,2R,6R,8R,9S)-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecan-8-yl]methoxy]-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yl]methoxy]-6-(hydroxymethyl)oxane-3,4,5-triol