1-((6aR*,12aR*)-2,4,9-trihydroxy-1,3,6a,8,10-pentamethyl-6a,12a-dihydro-5H,12H-isochromeno[3,4-b]chromen-11-yl)propan-2-one 在
caesium carbonate 作用下,
以
乙腈 为溶剂,
反应 0.5h,
以5%的产率得到(3R*,3aR*,5aR*,11aR*)-3,8-dihydroxy-1,3,5a,7,9-pentamethyl-10-(2-oxopropyl)-3a,4,5a,11a-tetrahydro-11H-cyclopenta[4,5]pyrano[2,3-b]chromen-2(3H)-one