ethyl (2Z)-2-(5-oxo-4-pent-4-en-2-yloxy-3-prop-2-enylfuran-2-ylidene)acetate 在
Grubbs catalyst first generation 作用下,
以
苯 为溶剂,
反应 16.0h,
以63%的产率得到[(Z)-5-Methyl-3-oxo-3,5,6,9-tetrahydro-2,4-dioxa-cyclopentacycloocten-(1Z)-ylidene]-acetic acid ethyl ester