methyl (4aS,6aS,6bR,8aR,14aR,14bR,16bS)-2,2,6a,6b,9,9,14a-heptamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,14,14a,14b,15,16b-hexadecahydrochryseno[1,2-g]quinazoline-4a(2H)-carboxylate 在
lithium iodide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 48.0h,
以74%的产率得到(1R,2R,11R,14R,15S,18S,23S)-2,10,10,14,15,21,21-heptamethyl-6,8-diazahexacyclo[12.12.0.02,11.04,9.015,24.018,23]hexacosa-4,6,8,24-tetraene-18-carboxylic acid