重氮甲烷 、 (3a
R)-6-((1Ξ,3Ξ)-3-acetoxy-1-hydroxy-butyl)-7
t-methyl-3-methylene-(3a
r,8a
c)-3,3a,4,7,8,8a-hexahydro-cyclohepta[
b]furan-2-one 以
乙醚 为溶剂,
生成
(3Ξ,3aR)-6-((1Ξ,3Ξ)-3-acetoxy-1-hydroxy-butyl)-7t-methyl-(3ar,8ac)-4,7,8,8a,4',5'-hexahydro-3aH-spiro[cyclohepta[b]furan-3,3'-pyrazol]-2-one