physalin G 在
rose bengal
氧气 作用下,
以
丙酮 为溶剂,
反应 5.0h,
以18%的产率得到(1R,2R,4R,12S,15S,18S,19R,20S,21S,23R,26S)-15-hydroxy-11,18,21-trimethyl-5,17,24,28,29-pentaoxaoctacyclo[17.9.1.11,20.02,12.04,10.015,19.018,23.021,26]triaconta-7,10-diene-6,16,25,30-tetrone