8-hydroxy-1-(3-methylbut-2-en-yl)-3,3-dimethyl-10-(2-methylbut-3-yn-2-yloxy)-3,3a,4,5-tetrahydro-1,5-methano-1H,7H-furo[3,4-d]xanthene-7,13-dione 以
N,N-二甲基甲酰胺 为溶剂,
反应 2.0h,
以50%的产率得到12-hydroxy-8,8,21,21-tetramethyl-19-(3-methylbut-2-enyl)-3,9,20-trioxahexacyclo[15.4.1.02,15.02,19.04,13.05,10]docosa-4(13),5(10),6,11,15-pentaene-14,18-dione