The forskolin prototype 14 has been elaborated in 9 steps from 2,4,4-trimethylcyclohexenone (5), the entire ring system materializing during oxyanionic Cope rearrangement of alcohol 10.
                                    从2,4,4-三甲基
环己烯酮(5)开始,福司柯林原型14已从9个步骤中精制而成,在醇10的
氧阴离子应对重排过程中,整个环系统得以实现。