Methyl 2-diazo-5-<(E,2R,4S)-2-methoxy-5-(2-phenylsulfanylethylidene)tetrahydro-2H-pyran-4-yl>-3-oxopentanoate 在
dirhodium tetraacetate 作用下,
以
苯 为溶剂,
以77%的产率得到Methyl (3R,4aS,8S,8aR)-3-methoxy-7-oxo-8-phenylsulfanyl-8a-vinyloctahydro-1H-2-benzopyran-8-carboxylate