Triacetoxyperiodinane → 5-(4,5-Dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-2-yl)-1-isopropyl-1H-[1,2,4]triazole-3-carbaldehyde

Participants

Reaction Steps

A suspension of [5-(8-bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-2-yl)-1-isopropyl-1H-[1,2,4]triazol-3-yl]-methanol 315 (166 mg, 0.51 mmol) in DCM (5 mL) was treated with Dess-Martin periodinane (DMP, 238 mg, 0.56 mmol) and resultant solution stirred at RT for 2 h under an atmosphere of nitrogen. The reaction was quenched by the addition of sodium thiosulphate (620 mg in 1 mL water) before the addition of further water and extracted twice with DCM. The combined organic extracts were washed with water then dried (Na2SO4), filtered and concentrated in vacuo to give 5-(4,5-Dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-2-yl)-1-isopropyl-1H-[1,2,4]triazole-3-carbaldehyde as a cream solid (170 mg, quantitative). LCMS: RT=4.30 min, [M+H]+ 324. 1H NMR 400 MHz (DMSO-d6) δ: 9.91 (1H, s), 8.43 (1H, dd, J=8.06, 1.78 Hz), 8.11 (1H, s), 7.34-7.34 (1H, m), 7.17-7.17 (1H, m), 7.07 (1H, dd, J=8.17, 1.23 Hz), 6.03 (1H, m), 4.57-4.48 (4H, m), 1.55 (6H, d, J=6.60 Hz)

Provenance & Evidence