Ipomoea alba

Dioscorea bulbifera Momordica charantia Ipomoea alba Morrenia odorata Parthenocissus quinquefolia... 

Elatine triandra Schkuhr Monochoria korsakowii Regel and Maack Monochoria vaginalis (Burm. F.) C. Presl. ex. Kunth Monochoria hastata (L.) Solms Monochoria korsakowii Regel and Maack Ipomoea alba L. 

Ipalbidine and ipalbine have been re-isolated from Ipomoea alba (Convolvulaceae) together with ipomine (844), not previously known from this source, and four new alkaloids (557). In this study, NMR spectra were reported for the first time for naturally occurring 842 and 843, and fiirfcer interesting facts about the chiroptical properties of the alkaloids emerged. For ipalbidine, the major alkaloid (26% of the total), the optical rotation was measur as -18 (c 0.64, EtOH), a smaller value than that reported for (- )-ipalbidine obtained by resolution of a synthetic racemate ([a]o -237°, c 1, CHCI3) (555). Since (+ )-ipalbidine is a known natural product (555), the authors suspected that the compound they isolated was in fact scalemic, in line with earlier speculations about the partially racemic... 

Pyroglutamic acid was used as the starting material in a synthesis of (+)-ipalbidine, an analgesic alkaloid obtained from the seeds of the white moonflower, Ipomoea alba. No bonds are made or broken to the chirality center of (5)-pyroglutamic acid in this synthesis. Which of the following is the structure of (+)-ipalbidine ... 

Fig. 3.28 Indolizidine alkaloids from the Convolvulaceae (i) Hydrophilic polyhydroxy alkaloids (swainsonine, 2- p>i-lentiginosine see Sect. 3.5.3) and (ii) unique lipophilic indolizidine alkaloids occurring in Ipomoea alba, I. hardwickii, and I. turbinata (see Sect. 3.6)...

Gourley JM, Heacock RA, Mclnnes AG, NikoUn B, Smith DG (1969) The structure of ipalbine, a new hexahydroindoUzidine alkaloid, isolated from Ipomoea alba L. J Chem Soc Chem Comm 709-710... 

Tofern B, Kaloga M, Witte L, Hartmann T, Eich E (1996) Comparative study of two convolvula-ceous species complex pattern of alkaloids in Ipomoea muricata and Ipomoea alba. Book of Abstracts, 44th Annual Congress of the Society for Medicinal Plant Research and a Joint Meeting with the Czech Biotechnology Society, Prague, p 146 (P 247)... 

Phenylethylamine turned out to be rather rare as a constituent in the Convolvulaceae (Eich, unpubhshed results). It was detected in the epigeal vegetative parts of Argyreia nervosa (Burm. f.) Boj., Ipomoea alba L., I. turbinata Lag., and Xenostegia medium (L.) D.F.Austin Staples. Tyramine was identified in Bonamia spectabilis (Choisy) Hall, f., I. eremnobrocha D J. Austin, I. turbinata. 

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