Hydrochloric Acid → 3-But-2-ynyl-4-oxo-3,4-dihydro-imidazo[5,1-d][1,2,3,5]tetrazine-8-carboxylic acid amide

Participants

Reaction Steps

To a cooled solution of 3-(Hydroxymethyl)-4-oxo-3,4-dihydroimidazo[5,1-][1,2,3,5]tetrazine-8-carboxamide (MM-001) (1 equiv) in acetonitrile (0.17 M concentration substrate in solvent) was added the 1-bromo-2-butyne (4 equivs) and DBU (1.4 equivs). The mixture was stirred at this temperature for 30 minutes whereupon it was acidified with 1 N HCl. The mixture was extracted with EtOAc (3×1 reaction volume). The combined organic extracts were combined, dried (MgSO4), filtered and concentrated in vacuo to give an oily residue which was then precipitated from Et2O and washed with further Et2O to give the title compound. 1H NMR (400 MHz, d6-DMSO) δ ppm: 8.84 (1H, s), 7.82 (1H, s), 7.70 (1H, s), 5.08 (2H, q, J=2.4 Hz), 1.84 (3H, t, J=2.4 Hz).

Provenance & Evidence