The synthesis of the A,B,C and D ring part 17 of diterpene stemodin (1) from 1,4-cyclohexanedione monoethylene ketal 8 by use of the successive intramolecular Diels-Alder reactions is described.
描述了通过使用连续的分子内Diels-Alder反应由1,4-
环己烷二酮单亚乙基
缩酮8合成二萜
果胶蛋白(1)的A,B,C和D环部分17。