重氮甲烷 、
(+-)-4-hydroxy-3ξ-hydroxymethyl-3ξ-methyl-1-oxo-(4ar,8ac)-octahydro-4t,7t-cyclo-isochromene-8t-carboxylic acid 在
乙醚 作用下,
生成 (+/-)-4-hydroxy-3ξ-hydroxymethyl-3ξ-methyl-1-oxo-(4a
r,8a
c)-octahydro-4
t,7
t-cyclo-isochromene-8
t-carboxylic acid methyl ester