synthesis of C3-triketone 1, starting from optically pure lactone 2, which is commercially available in both enantiomeric forms, is described. The absolute configuration of a chiral perhy-drotriquinacene derivative is therefore established for the first time by chemical correlation. The stereocheraical assignments are also confirmed by the circular dichroism of both (+)-1, which shows a positive Cotton effect
描述了从光学纯的内酯2开始的C 3-三酮1的有效的对映选择性合成,其可以以两种对映体形式商购。因此,通过
化学相关性首次建立了手性过氢-对三苯并
喹啉衍
生物的绝对构型。立体
化学的分配也通过显示正棉花效应的(+)-1和呈现正激子手征性的三
苯甲酸酯(+)-12的圆二色性得到证实。