(3aR,4R,6aS,7R,9R,9aR,9bR)-9-(2-Carboxy-propyl)-4,7-dimethyl-1-methylene-decahydro-phenalene-3a-carboxylic acid 、
碘甲烷 在
lithium diisopropyl amide 作用下,
生成
(3aR,4R,6aS,7R,9R,9aR,9bR)-9-(2-Carboxy-2-methyl-propyl)-4,7-dimethyl-1-methylene-decahydro-phenalene-3a-carboxylic acid