SIRT1 Activation Enhancing 8,3'-Neolignans from the Twigs of Corylopsis coreana Uyeki.

Three undescribed 8,3'-neolignans, corynol (1), 3-methoxy-corynol (2) and 3'-deoxy-corynol (3), together with two bergenin derivatives, three flavonoids, two hydrolysable tannins and six simple phenolic compounds, were isolated from the twigs of Corylopsis coreana Uyeki. The structures of the 8,3'-neolignans were elucidated by analyzing their NMR, HRESIMS and ECD spectra. All the isolated compounds were evaluated for their SIRT1 stimulatory activity, and 3'-deoxy-corynol (3) showed SIRT1 stimulation activity. Furthermore, a docking study of 3 was performed with three representative binding pockets of SIRT1.