Nghiên cứu tổng hợp các hybrid mới của artemisinin với zidovudin (AZT)

Abstract

The synthesis of new hybrids of artemisinin with zidovudin (AZT) was described via six-step procedure. Firstly, the reaction of dihydroartemisinin (2) with NaN₃ in the presence of (CH₃)₃SiCl and a catalytic amount of KI in CH₂Cl₂ at ice water temperature gave 10β-azidoartemisinin (4). This compound was then hydrolysed by Ph₃P in THF/H₂O at 65 ^oC for 6 h to furnish 10β-azidoartemisinin (5). Next, the reaction of 5 with anhydride dicacboxylics (anhydride glutaric, 3,3-dimethyl anhydride glutaric) in the presence of DMAP gave new intermediates 7a,b. Compound 6 was obtained by the reaction of 5 with suberic acid monomethyl ester in CH₂Cl₂ in the presence of EDC and DMAP at ambient temperature, followed by the hydrolysis in CH₂Cl₂/EtOH = 9:1 using NaOH 0.2 N. Finally, the reaction of 6 and 7a,b with AZT in CH₂Cl₂ using EDC and DMAP as a catalytic system afforded novel hybrids 8a-c in moderate yields. The structures of synthesized compounds were confirmed based on spectroscopic methods: IR, NMR and HRMS.

Keywords. Artemisinin, dihydroartemisinin, artemether, arteether, sodium azide, hybrid.