1-acetyl-1-(diazoacetyl)cyclopropane 、
methyl 5-(tetrahydro-2H-pyran-2-yloxy)pent-2-ynoate 在
dirhodium tetraacetate 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
以21%的产率得到methyl 1-methyl-3-oxo-5-(2-((tetrahydro-2H-pyran-2-yl)oxy)ethyl)-7-oxaspiro[bicyclo[2.2.1]heptane-2,1'-cyclopropan]-5-ene-6-carboxylate