Ipvelutine, 7ß-Acetoxy-2α-(tigloyloxy)tropane, an Unusual Tropane Alkaloid from Ipomoea velutina R. Br. (Convolvulaceae).

Convolvulaceae provide a rich source of tropane alkaloids, however, 2-substituted tropanes have been described for only few species of this taxon. In this note, 2,7-diesters such as ipvelutine [7ß-acetoxy-2α-(tigloyloxy)tropane] isolated from the vegetative parts of the Australian Ipomoea velutina R. BR. are described as a new group of tropane diesters.

Stereochemistry of Consabatine from Convolvulus sabatius Viv. (Convolvulaceae).

The stereochemistry of consabatine, which was isolated from the roots of Convolvulus sabatius Viv. as a novel natural compound, has now been determined by the synthesis of its Mosher esters. Consabatine was found to be 1'R-configurated.