Abstract Phenoselenazines are nitrogen and selenium-based heterocyclic compounds that have important biological activities. However, their preparation methods are scarce and difficult to handle. The synthesis of a phenoselenazine from a simple and robust CuO nanoparticle catalyzed methodology, using bis-aniline-diselenide and 1,2-dihalobenzenes under microwave irradiation. Also, the double-cross-coupling reaction mechanism for C-Se and C-N bond formation, including the observation of a reaction intermediate by mass spectrometry have been studied. seleniumbased selenium based activities However handle methodology bisanilinediselenide bis aniline diselenide 1,2dihalobenzenes 12dihalobenzenes dihalobenzenes 1,2 1 2 irradiation Also doublecrosscoupling double cross coupling CSe C Se CN N formation studied 2dihalobenzenes 12 1,

Abstract In pursuit of potential agents to treat Chagas disease and leishmaniasis, we report the design, synthesis, and identification novel naphthoquinone hydrazide-based molecular hybrids. The compounds were subjected to in vitro trypanocide and leishmanicidal activities. N’-(1,4-Dioxo-1,4-dihydronaphthalen-2-yl)-3,5-dimethoxybenzohydrazide (13) showed the best performance against Trypanosoma cruzi (IC50 1.83 µM) and Leishmania amazonensis (IC50 9.65 µM). 4-Bromo-N’-(1,4-dioxo-1,4-dihydronaphthalen-2-yl)benzohydrazide (16) exhibited leishmanicidal activity (IC50 12.16 µM). Regarding trypanocide activity, compound 13 was low cytotoxic to LLC-MK2 cells (SI = 95.28). Furthermore, through molecular modeling studies, the cysteine proteases cruzain, rhodesain and CPB2.8 were identified as the potential biological targets. leishmaniasis design synthesis hydrazidebased hydrazide based hybrids activities N1,4Dioxo1,4dihydronaphthalen2yl3,5dimethoxybenzohydrazide N14Dioxo14dihydronaphthalen2yl35dimethoxybenzohydrazide NDioxodihydronaphthalenyldimethoxybenzohydrazide N 1,4 Dioxo dihydronaphthalen 2 yl 3,5 dimethoxybenzohydrazide 1 4 3 5 (13 IC50 IC (IC5 183 83 1.8 µM 965 9 65 9.6 µM. . 4BromoN1,4dioxo1,4dihydronaphthalen2ylbenzohydrazide 4BromoN14dioxo14dihydronaphthalen2ylbenzohydrazide BromoNdioxodihydronaphthalenylbenzohydrazide Bromo dioxo benzohydrazide 16 (16 1216 12 12.1 LLCMK2 LLCMK LLC MK2 MK LLC-MK SI 95.28. 9528 95.28 95 28 95.28) Furthermore studies cruzain CPB28 CPB CPB2 8 CPB2. targets N1 4Dioxo1 4dihydronaphthalen2yl3 5dimethoxybenzohydrazide 14 1, 35 3, (1 IC5 (IC 18 1. 96 6 9. 4BromoN1 4dioxo1 4dihydronaphthalen2ylbenzohydrazide BromoN ylbenzohydrazide 121 12. 952 95.2 4Dioxo dihydronaphthalenyl 4dihydronaphthalen2yl ( 4BromoN 4dioxo dihydronaphthalenylbenzohydrazide 95.