(2S,3R)-2-Acetoxy-3-formyl-3-methyl-2-((R)-2-methyl-4-oxo-butyl)-6-oxo-hexanoic acid methyl ester 在
dibenzylammonium trifluoroacetate 作用下,
以
苯 为溶剂,
以54%的产率得到(4aS,5S,7R,8S,8aR)-5-Acetoxy-8-formyl-2-hydroxy-4a,7-dimethyl-octahydro-chromene-5-carboxylic acid methyl ester