(E)-5-(6-Hydroxymethyl-3-methyl-4-oxo-1-oxa-spiro[4.4]nona-2,6-dien-2-yl)-4,4-dimethyl-pent-2-enoic acid ethyl ester 在
potassium carbonate 作用下,
以
甲醇 、
水 为溶剂,
反应 12.0h,
以91.5%的产率得到(E)-5-(6-Hydroxymethyl-3-methyl-4-oxo-1-oxa-spiro[4.4]nona-2,6-dien-2-yl)-4,4-dimethyl-pent-2-enoic acid