Lignans from the bark of Magnolia kobus.

مقال فى مجلة

The Et2O-soluble fraction from the bark of Magnolia kobus led to the isolation of two new lignans,

(þ)-(7a,7’a,8a,8’a)-3’,4,4’,5,5’-pentamethoxy-7,9’:7’,9-diepoxylignan-3-ol (1) and (þ)-(7a,7’a,8a,8’a)-

4,5-dimethoxy-3’,4’-(methylenedioxy)-7,9’: 7’,9-diepoxylignan-3-ol (2), along with five known lignans

3 – 7. Their structures were established on the basis of various spectroscopic analyses including 1D- (1H,

13C, and DEPT) and 2D-NMR (COSY, NOESY, HMQC, and HMBC) and by comparison of their

spectral data with those of related compounds.