(4'aS,6'aR,6'bR,12'aR)-6'a-[(2-diethoxyphosphorylacetyl)oxymethyl]-2',2',6'b,9',9',12'a-hexamethylspiro[1,3-dioxolane-2,10'-3,4,5,6,6a,7,8,8a,11,12,13,14b-dodecahydro-1H-picene]-4'a-carboxylic acid 、
(2E)-4-[(2-Formyl-4-hydroxyphenyl)amino]-4-oxo-2-butenoic acid 在
lithium hydroxide 作用下,
以
水 、
N,N-二甲基甲酰胺 为溶剂,
反应 3.5h,
生成 (4'aS,6'aR,6'bR,12'aR)-6'a-[[(E)-3-[2-[[(E)-3-carboxyprop-2-enoyl]amino]-5-hydroxyphenyl]prop-2-enoyl]oxymethyl]-2',2',6'b,9',9',12'a-hexamethylspiro[1,3-dioxolane-2,10'-3,4,5,6,6a,7,8,8a,11,12,13,14b-dodecahydro-1H-picene]-4'a-carboxylic acid