Four New Terpenes from the Pericarp of Platycladus orientalis.

Rubellawus A–D, Four New Diterpenoids Isolated from Callicarpa rubella and Their Anti‐NLRP3 Inflammasome Effects

“…It can be inferred that the hydroxy group linked to C(4) was replaced by the carboxy group. The conclusion was examined by the HMBCs (Figure 2 The known compounds were elucidated as 14αhydroxyisopimaric acid (5), [23] 6,7-dehydrosandaracopimaric acid (6) [24] and isopimaric acid (7), [25] , respectively, by comparing their NMR signals with those published in the literature.…”

A New Labdane Diterpene from Rauvolfia Tetraphylla Linn. (Apocynaceae)

“…22 The 1 H-and 13 C NMR spectra (Table 1) of the side chain attached at C-9 of compound 1 were comparable to those of another labdane diterpene, platyclolactonic acid and its methyl ester. 23 The presence of the β-methyl-α,β-unsaturated butyro-γ-lactone moiety was established from its UV, IR, 1 H-and 13 C NMR spectral data. C-16).…”

“…22 The 1 H-and 13 C NMR spectra (Table 1) of the side chain attached at C-9 of compound 1 were comparable to those of another labdane diterpene, platyclolactonic acid and its methyl ester. 23 The presence of the β-methyl-α,β-unsaturated butyro-γ-lactone moiety was established from its UV, IR, 1 H-and 13 C NMR spectral data. Careful scrutiny of 1 H NMR data for H-3 (a carbinol methine proton appeared at δ 3.13, dd, J = 4.8, 9.6 Hz) and H-12 (a lactonized carbinol methine proton appeared at δ 4.72, brd, J = 10.5 Hz) clearly revealed the respective stereochemistry of C-3 and C-12 -both the methine protons (H-3 and H-12) lie below the plane, thereby, establishing configurations for these positions as 3S and 12S.…”