reaction followed by an intramolecular spirocyclization via an epoxide-opening reaction. Following optical resolution by chiral HPLC, the absolute configurations of both enantiomers of berkeleyamide D were determined by the vibrational circular dichroism exciton chirality method.
(±)-伯来酰胺D的首次合成已经完成。该合成的关键特征包括通过Darzens反应形成α,β-环氧-γ-内酰胺,通过C-酰化反应构建螺环系统,然后通过
环氧化物开放反应进行分子内螺环化。通过手性HPLC光学拆分后,通过振动圆二色性激子手性法确定了伯来酰胺D的两种对映体的绝对构型。