2,5-二羟基苯甲酸甲酯 、
(E)-3-[(3aR,6aR)-spiro[3a,6a-dihydrofuro[2,3-d][1,3]dioxole-2,1'-cyclohexane]-5-yl]-2-methylprop-2-en-1-ol 在
silver(l) oxide 作用下,
以100%的产率得到methyl (1'S,4a'S,5'S,7a'R,10a'R,10b'R,10c'R)-1'-hydroxy-5'-methyl-4'-oxo-1',5',7a',10a',10b',10c'-hexahydrospiro[cyclohexane-1,9'-[1,5](epoxymethano)naphtho[1',2':4,5]furo[2,3-d][1,3]dioxole]-4a'(4'H)-carboxylate