(4S,5S,6R,8R)-2-((3S,4S,5S,6S)-6-Ethyl-2,4-dihydroxy-3,5-dimethyl-tetrahydro-pyran-2-yl)-8-(6-ethyl-3,5-dimethyl-4-oxo-4H-pyran-2-yl)-5-(4-methoxy-benzyloxy)-4,6-dimethyl-nonane-3,7-dione 在
2,3-二氯-5,6-二氰基-1,4-苯醌 作用下,
以
二氯甲烷 为溶剂,
以56%的产率得到(2S,3S,5S,6R,8S,9S,10S,11S)-8-Ethyl-2-[(1R,3R)-3-(6-ethyl-3,5-dimethyl-4-oxo-4H-pyran-2-yl)-1-methyl-2-oxo-butyl]-10-hydroxy-3,5,9,11-tetramethyl-1,7-dioxa-spiro[5.5]undecan-4-one