乙酸酐 、
ajugamarin D1 ((12S)-18,19-diacetoxy-4α,6α,12-trihydroxy-1β-<(2S)-2-methylbutanoyloxy>neo-clerod-13(14)-en-15,16-olide) 在
吡啶 作用下,
反应 1.0h,
生成 (S)-2-Methyl-butyric acid (1R,4R,4aR,5S,7R,8S,8aR)-5-acetoxy-4,4a-bis-acetoxymethyl-8-[(S)-2-acetoxy-2-(5-oxo-2,5-dihydro-furan-3-yl)-ethyl]-4-hydroxy-7,8-dimethyl-decahydro-naphthalen-1-yl ester