(1S,2S,4S,5R)-4-[(2R,3R,4R,5R,6R)-5-Acetoxy-6-acetoxymethyl-3-acetylamino-4-((2R,3R,4S,5S,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-5-carboxymethoxy-cyclohexane-1,2-dicarboxylic acid di-tert-butyl ester 在
甲醇 、
sodium methylate 作用下,
以80%的产率得到(1S,2S,4S,5R)-4-[(2R,3R,4R,5R,6R)-3-Acetylamino-5-hydroxy-6-hydroxymethyl-4-((2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-5-carboxymethoxy-cyclohexane-1,2-dicarboxylic acid di-tert-butyl ester