Pectolinarin, a flavone heteroside, was isolated from Distictella elongata (Vahl) Urb. leaves ethanol extract, along with a mixture of ursolic, pomolic and oleanolic acids, besides β-sitosterol. Their structures were established on the basis of spectral analysis (1H and 13C NMR, 1D and 2D) and they were compared with literature. This is the first report on the occurrence of this flavonoid in a species of the Bignoniaceae family.
Bignoniaceae; Distictella elongata; pectolinarin; triterpenes
| Position | Type | δC ppm | δH ppm (M, J) |
|---|---|---|---|
| 2 | C | 164.3 | - |
| 3 | CH | 103.5 | 6.93 (s) |
| 4 | C | 182.9 | - |
| 5 | C | 152.7 | - |
| 6 | C | 133.2 | - |
| 7 | C | 157.3 | - |
| 8 | CH | 94.3 | 6.94 (s) |
| 9 | C | 152.1 | - |
| 10 | C | 105.4 | - |
| - | - | - | 12.96 (s, 5-OH) |
| 1′ | C | 122.8 | - |
| 2′ | CH | 128.4 | 8.04 (d, J = 8.0 Hz) |
| 3′ | CH | 114.8 | 7.17 (d, J = 8.0 Hz) |
| 4′ | C | 162.8 | - |
| 5′ | CH | 114.8 | 7.17 (d, J = 8.0 Hz) |
| 6′ | CH | 128.4 | 8.04 (d, J = 8.0 Hz) |
| 6-OCH3 | CH3 | 60.3 | 3.87 (s) |
| 4′-OCH3 | CH3 | 55.6 | 3.78 (s) |
| 1″ | CH | 100.4 | 5.12 (d, J = 4.0 Hz) |
| 2″ | CH | 73.2 | 3.33* * Approximate shifts obtained by HSQC experiment. |
| 3″ | CH | 76.5 | 3.35* * Approximate shifts obtained by HSQC experiment. |
| 4″ | CH | 69.5 | 3.18* * Approximate shifts obtained by HSQC experiment. |
| 5″ | CH | 75.8 | 3.63* * Approximate shifts obtained by HSQC experiment. |
| 6″ | CH2 | 66.0 | 3.89; 3.48 (dd) |
| 1′″ | CH | 100.4 | 4.57 (d, J = 1.1 Hz) |
| 2′″ | CH | 70.8 | 3.46* * Approximate shifts obtained by HSQC experiment. |
| 3′″ | CH | 70.4 | 3.67* * Approximate shifts obtained by HSQC experiment. |
| 4′″ | CH | 72.0 | 3.16* * Approximate shifts obtained by HSQC experiment. |
| 5′″ | CH | 68.3 | 3.41* * Approximate shifts obtained by HSQC experiment. |
| 6′″ | CH3 | 17.8 | 1.06 (d, J = 4.0 HZ) |
