Hydrogenation of the tricyclic acetal 4, which was prepared from the octalone 3 by 2 steps, yielded the trans-dihydro product 5 with high stereoselectivity, while hydrogenation of the dimethyloctalones, 8 and 9, showed low stereoselectivity. 5 was converted to the cyclopropy-decalone 2 in high yield. Reductive alkylation of 2 gave regioselectively the C1 alkylated trimethyldecalone 12, which was converted to the key intermediate to α-onocerin 16, thus illustrating potential utility of 2 in terpenoid synthesis.
                                    由辛酮 3 分两步制备的
三环缩醛 4 加氢生成反式二氢产物 5,立体选择性高,而二甲基辛酮 8 和 9 的加氢则显示出较低的立体选择性。5 可以高产率转化为环丙基
癸酮 2。2 的还原烷基化反应具有区域选择性地得到了 C1 烷基化的三甲基
癸酮 12,并将其转化为 α-onocerin 16 的关键中间体,从而说明了 2 在
萜类化合物合成中的潜在用途。