(5R,6R,7S,8R)-6,7,8-三(苄氧基)-5-[(苄氧基)甲基]-4-氧杂-1,2-二氮杂螺[2.5]辛-1-烯 、
马来酸二甲酯 在
palladium hydroxide - carbon 4 A molecular sieve 、
氢气 作用下,
生成 dimethyl (1R,2R,5R,6R,7S,8R)-6,7,8-trihydroxy-5-(hydroxymethyl)-4-oxaspiro<2.5>octane-1,2-dicarboxylate 、 dimethyl (1S,2S,5R,6R,7S,8R)-6,7,8-trihydroxy-5-(hydroxymethyl)-4-oxaspiro<2.5>octane-1,2-dicarboxylate 、 dimethyl (1R,2S,5R,6R,7S,8R)-6,7,8-trihydroxy-5-(hydroxymethyl)-4-oxaspiro<2.5>octane-1,2-dicarboxylate 、
dimethyl (1S,2R,5R,6R,7S,8R)-6,7,8-trihydroxy-5-(hydroxymethyl)-4-oxaspiro<2.5>octane-1,2-dicarboxylate