Bioorganic and Medicinal Chemistry p. 3498 - 3507 (2014)
Update date:2022-08-11
Topics:
Hedidi, Madani
Bentabed-Ababsa, Ghenia
Derdour, A?cha
Roisnel, Thierry
Dorcet, Vincent
Chevallier, Floris
Picot, Laurent
Thiéry, Valérie
Mongin, Florence
Benzothiophene, benzofuran, benzothiazole and benzoxazole were deprotometalated using the lithium-zinc combination prepared from ZnCl 2·TMEDA (TMEDA = N,N,N′,N′- tetramethylethylenediamine, 1 equiv) and lithium 2,2,6,6-tetramethylpiperidide (LiTMP, 3 equiv). Subsequent interception of the 2-metalated derivatives using iodine as electrophile led to the iodides in 81%, 82%, 67% and 42% yields, respectively. These yields are higher (10% more) than those obtained using ZnCl2·TMEDA (0.5 equiv) and LiTMP (1.5 equiv), except in the case of benzoxazole (10% less). The crude iodides were involved in the N-arylation of pyrrole, indole, carbazole, pyrazole, indazole, imidazole and benzimidazole in the presence of Cu (0.2 equiv) and Cs2CO3 (2 equiv), and using acetonitrile as solvent (no other ligand) to provide after 24 h reflux the expected N-arylated azoles in yields ranging from 33% to 81%. Using benzotriazole also led to N-arylation products, but in lower 34%, 39%, 36% and 6% yields, respectively. A further study with this azole evidenced the impact of 2,2,6,6-tetramethylpiperidine on the N-arylation yields. Most of the C,N′-linked bis-heterocycles thus synthesized (in particular those containing benzimidazole) induced a high growth inhibition of A2058 melanoma cells after a 72 h treatment at 10-5 M.
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