Enantiopure substituted pyridines as promising antimalarial drug candidates

Guillaume Bentzinger (1) , Etienne Pair (1) , Jean Guillon (2) , Mathieu Marchivie (3) , Catherine Mullié (1) , Patrice Agnamey (1) , Alexandra Dassonville-Klimpt (1) , Pascal Sonnet (1)

1 AGIR - Agents infectieux, résistance et chimiothérapie - UR UPJV 4294
2 ARNA - Acides Nucléiques : Régulations Naturelle et Artificielle
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We describe the enantioselective synthesis and biological evaluation of 4-(2-amino-1-hydroxyethyl)pyridines (4 AHPs) as new antimalarial drug candidates. In particular, two routes to obtain the key-intermediate 4-vinyl-pyridine were studied. These routes are based on a Kröhnke-type cyclization or on metal-catalyzed reactions. The Kröhnke-type cyclization route is faster but only efficient at low scale since this pathway involves a Wittig reaction that requires severe temperature-control. Consequently, we designed a second route based on metal-catalyzed reactions. This way is longer but the 4-vinyl-pyridine can be obtained on a 5 g scale at least. Finally, a regioselective SN2 ring-opening of enantiopure epoxides by alkyl primary amines allowed the synthesis of eight 4-AHPs with global yields up to 41%. These compounds show strong in vitro antimalarial activity against P. falciparum strains and are more active that chloroquine and mefloquine. These results demonstrate that 4-AHPs are promising antimalarial drug candidates.

Mots clés: Malaria P. falciparum; Arylaminoalcohols; Enpiroline; Asymmetric synthesis

Domaines: Chimie; Matériaux; Sciences du Vivant [q-bio]

Guillaume Bentzinger, Etienne Pair, Jean Guillon, Mathieu Marchivie, Catherine Mullié, et al.. Enantiopure substituted pyridines as promising antimalarial drug candidates. Tetrahedron, 2020, 76 (15), 131088 (10 p.). ⟨10.1016/j.tet.2020.131088⟩. ⟨hal-03611926⟩