5-Methoxyjusticidin A, a New Arylnaphthalene Lignan from Protium unifoliolatum

Abstract

A new arylnaphthalene lignan, 9-(1,3-benzodioxol-5-yl)-4,5,6, 7-tetramethoxynaphtho[2,3-C]furan-1(3H)-one (5-methoxyjusticidin A, 1), was isolated from a Et2O extract of the wood of Protium unifoliolatum. The structure of 1 was determined by both spectroscopic and X-ray crystallographic methods.

A New Lignan and Four New Lignan Glycosides from Mananthes patentiflora

“…433.0899)). The UV spectrum was typical for an arylnaphthalene system; and IR bands at 1764 and 934 cm À1 suggested the presence of a g-lactone and a OCH 2 O group, respectively [9]. In the 1 H-NMR spectrum of 1 ( Table 1), there were four aromatic H-atoms: one signal appeared at d(H) 6.67 (s, HÀC(8)) 1 ), together with an ABX system characteristic of a 1,3,4-trisubstituted aromatic unit (d(H) 6.95 (d, J = 7.8, 1 H); 6.66 (dd, J = 7.8, 1.5, 1 H); 6.77 (d, J = 1.5, 1 H)).…”

Three new lignan glycosides fromMananthes patentiflora

“…The UV spectrum was typical for arylnaphthalene. 4 The IR spectrum showed hydroxyl (3423 cm 21 ), g-lactone (1752 cm 21 ) and aromatic (1624 cm 21 ) absorption bands. 5,6 The 1 H NMR spectrum of 1 exhibited the presence of five aromatic protons, two singlets at d 8.94 (1H, s) and 7.34 (1H, s), and three ABX system protons at d 7.03 (1H, d, J ¼ 7.6 Hz), 7.14 (1H, d, J ¼ 7.6 Hz), and 7.12 (1H, s).…”

Three New Arylnaphthalide Lignans from the Aerial Parts of Bupleurum marginatumWall. ex DC.

“…(7) 6.18 (s) --C(7)ÀOCH 2 OÀC (8 Table 2. suggested that it was an arylnaphthalide lignan with a g-lactone unit [9]. From the 1 Hand 13 C-NMR data (Tables 1 and 2) in combination with further results from HSQC and HMBC spectra (Fig.…”

“…The UV maxima at 204 and 259 nm and the IR (KBr) absorption bands at 3462 and 936 cm À1 suggested that it was also an arylnaphthalide lignan with a g-lactone unit [9]. After analyses of the (Fig.…”