Four new compounds isolated from Psoralea corylifolia and their diacylglycerol acyltransferase (DGAT) inhibitory activity

Abstract

A new bakuchiol compound Δ11-12-hydroxy-12-dimethyl bakuchiol (1), a new flavanone compound 2(S)-6-methoxy-7- hydroxymethylene-4′-hydroxyl-flavanone (8), and two new isoflavanone compounds 4′,7-dihydroxy-3′-(6”β-hydroxy-3″,7″-dimethyl-,2″,7″-dibutenyl)-geranylisoflavone (9) and 4′,7-dihydroxy-3′-(7″-hydroxy-7″-methyl-2″,5″-dibutenyl)-geranylisoflavone (10) together with eight known compounds (2？7, 11, 12) were isolated from the P. corylifolia. Their structures were elucidated on the basis of spectroscopic and physico-chemical analyses. All the isolates were evaluated for in vitro inhibitory activity against DGAT1/2. Among them, compounds 3, 9 and 10 were found to exhibit selective inhibitory activity on DGAT1 with IC50 values ranging from 93.7 ± 1.3 to 96.2 ± 1.1 μM. Compound 1 showed inhibition activity on DGAT1 with IC50 values 73.4 ± 1.3 μM and inhibition of DGAT2 with IC50 value 121.1 ± 1.3 μM