Synthesis and bioactivity of novel isoxazole chalcone derivatives on tyrosinase and melanin synthesis in murine B16 cells for the treatment of vitiligo
chalcone derivatives 1–18, bearing isoxazole moieties were designed and synthesized, and biologically evaluated for their activity on mushroom tyrosinase and melanin synthesis in murine B16 cells. The result indicated that most of prepared compounds 1–18 showed potent activating effect on tyrosinase, especially for 1–2, 4, 6–7, 9 and 15. Among them, compounds 2, 4 and 9 demonstrated the best activity with
The synthesis of D-ring tetrazole-isoxazole and tetrazole-triazole sinomenine derivatives at N–CH3 via 1, 3-dipolar cycloadditionreactions were accomplished and a total of 34 novel sinomenine N-heterocyclic derivatives were obtained in 69–93% yields. The N–CH3 of sinomenine was first transformed into N–CN structure under the action of cyanogen bromide, and then N–CN reacted with sodium azide to give
通过1, 3-偶极环加成反应在N - CH 3 合成了D环四唑-异恶唑和四唑-三唑青藤碱衍生物,共得到34个青藤碱N-杂环衍生物,收率为69-93%。青藤碱的N -CH 3在溴化氰作用下首先转变为N -CN结构,然后N -CN与叠氮化钠反应生成N-四唑衍生物。四唑上的N -H键被不同的异恶唑溴化物取代,直接得到四唑-异恶唑青藤碱衍生物。N号四唑上的-H键被炔丙基溴取代,得到带有炔丙基的青藤碱衍生物,末端炔烃再与1, 3-偶极原位反应得到D环四唑-三唑青藤碱衍生物。所有合成的衍生物均通过 FT-IR、HRMS、1 H NMR 和13 C NMR 光谱进行表征。
Design, synthesis and bioactivity of myricetin derivatives for control of fungal disease and tobacco mosaic virus disease