Talatisamine, a C19-diterpenoid alkaloid from Chinese traditional herbal `Chuanwu'

Abstract

The title compound [systematic name: (1S,4S,5R,7S,8S,9R,10R,11S,13S,14S,16S,17R)-N-methyl-8,14-dihydroxy-1,16-trimethoxy-4-(methoxymethylene)aconitane], C24H39NO5, was isolated from the roots of Aconitum carmichaelii Debx., which is known as `Chuanwu' in Chinese traditional herbal medicine. The molecule has an aconitane carbon skeleton with four six-membered rings and two five-membered rings, including a six-membered N-containing heterocyclic ring. Both five-membered rings adopt envelope conformations. The four six-membered adopt chair conformations. Two intramolecular O—H...O hydrogen bonds occur.