(4aR,10aR)-10a-hydroxy-7-isopropyl-6-methoxy-1,1,4a-trimethyl-1,2,3,4,4a,10a-hexahydrophenanthrene-9,10-dione 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
以22%的产率得到(6aR,11aR)-3-isopropyl-2-methoxy-8,8,11a-trimethyl-6a,8,9,10,11,11a-hexahydrocyclohepta[c]isochromene-5,7-dione