33581-98-5Relevant articles and documents
Peptidomimetic Vinyl Heterocyclic Inhibitors of Cruzain Effect Antitrypanosomal Activity
Chenna, Bala C.,Li, Linfeng,Mellott, Drake M.,Zhai, Xiang,Siqueira-Neto, Jair L.,Calvet Alvarez, Claudia,Bernatchez, Jean A.,Desormeaux, Emily,Alvarez Hernandez, Elizabeth,Gomez, Jana,McKerrow, James H.,Cruz-Reyes, Jorge,Meek, Thomas D.
, p. 3298 - 3316 (2020/04/08)
Cruzain, an essential cysteine protease of the parasitic protozoan, Trypanosoma cruzi, is an important drug target for Chagas disease. We describe here a new series of reversible but time-dependent inhibitors of cruzain, composed of a dipeptide scaffold appended to vinyl heterocycles meant to provide replacements for the irreversible reactive "warheads" of vinyl sulfone inactivators of cruzain. Peptidomimetic vinyl heterocyclic inhibitors (PVHIs) containing Cbz-Phe-Phe/homoPhe scaffolds with vinyl-2-pyrimidine, vinyl-2-pyridine, and vinyl-2-(N-methyl)-pyridine groups conferred reversible, time-dependent inhibition of cruzain (Ki? = 0.1-0.4 μM). These cruzain inhibitors exhibited moderate to excellent selectivity versus human cathepsins B, L, and S and showed no apparent toxicity to human cells but were effective in cell cultures of Trypanosoma brucei brucei (EC50 = 1-15 μM) and eliminated T. cruzi in infected murine cardiomyoblasts (EC50 = 5-8 μM). PVHIs represent a new class of cruzain inhibitors that could progress to viable candidate compounds to treat Chagas disease and human sleeping sickness.
The chemistry of [1,2,3]triazolo[1,5-c]pyrimidine
Abarca,Ballesteros,Chadlaoui,Miralles,Murillo,Colonna
, p. 10111 - 10117 (2007/10/03)
Reactions of [1,2,3]triazolo[1,5-c]pyrimidine 2 with some electrophiles and nucleophiles are reported. Triazole ring opening and loss of nitrogen is the principal reaction with electrophiles. With strong acids protonation on N6 competes successfully. Derivatives in which the pyrimidine ring has been opened are obtained in reactions with nucleophiles. No stable simple substitution compounds were found.