triethyl phosphonoacetate 、
(3aR,3bR,8aR,9aR)-2,2,3b-Trimethyl-hexahydro-1,3,4,9-tetraoxa-cyclopenta[a]azulen-6-one 在
sodium hydride 作用下,
以
甲苯 为溶剂,
以78%的产率得到((3aR,3bR,8aR,9aR)-2,2,3b-Trimethyl-3a,3b,7,8,8a,9a-hexahydro-1,3,4,9-tetraoxa-cyclopenta[a]azulen-6-yl)-acetic acid ethyl ester