1-(Ethoxycarbonylmethyl)-1H-pyrazole-4-boronic acid pinacol ester → 2-{4-[2-(2-Pyridin-4-ylmethyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-pyrazol-1-yl}-ethanol

Participants

Reaction Steps

Similarly to as described in General Procedure C: 8-Bromo-2-(2-pyridin-4-ylmethyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene was reacted with ethyl 2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)acetate. The crude ester was reduced with lithium aluminum hydride as described for 2-{4-[2-(2-Isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-pyrazol-1-yl}-ethanol. The product was purified by HPLC to give 302 as a colorless solid (32 mg). LCMS: 472.1.

Provenance & Evidence