(1R,2S,10S,11S)-10-ethyl-4,6-dimethoxy-11-methyl-2-phenyl-19-oxapentacyclo[9.6.2.02,10.03,8.012,17]nonadeca-3(8),4,6,12,14,16-hexaene-9,18-dione 在
对苯二酚 作用下,
以
二苯醚 为溶剂,
反应 6.0h,
以8%的产率得到(4bS,4cS,9bS,9cR)-4c-Ethyl-7,9-dimethoxy-4b-methyl-9b-phenyl-4b,4c,9b,9c-tetrahydro-benzo[b]cyclopropa[lm]fluoren-5-one