雷公藤红素 、
4-(2-bromoethoxy)-6-methyl-2-pyrone 在
potassium carbonate 作用下,
以
乙腈 为溶剂,
以56%的产率得到2-((6-methyl-2-oxo-2H-pyran-4-yl)oxy)ethyl-(2R,4aS,6aS,12bR,14aS,14bR)-10-hydroxy-2,4a,6a,9,12b,14a-hexamethyl-11-oxo-1,2,3,4,4a,5,6,6a,11,12b,13,14,14a,14b-tetradecahydropicene-2-carboxylate