2,2-二甲氧基丙烷 、
Acetic acid (1S,5R,6S)-5-hydroxy-4-hydroxymethyl-2-oxo-7-oxa-bicyclo[4.1.0]hept-3-en-3-ylmethyl ester 在
4-甲基苯磺酸吡啶 作用下,
以
丙酮 为溶剂,
以89%的产率得到Acetic acid (1aS,7aR,7bS)-6,6-dimethyl-2-oxo-2,4,7a,7b-tetrahydro-1aH-1,5,7-trioxa-cyclopropa[a]naphthalen-3-ylmethyl ester