Triphenylphosphine → 7-[(6-Chloro[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methoxy]furo[3,2-c]pyridin-6-amine

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Reaction Conditions

Reaction Steps

To a mixture of 6-nitrofuro[3,2-c]pyridin-7-ol (50.0 mg, 0.278 mmol), (6-chloro[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methanol (102 mg, 0.555 mmol), triphenylphosphine (191 mg, 1.11 mmol) and THF (10 mL) under nitrogen at rt was added diisopropyl azodicarboxylate (0.219 mL, 1.11 mmol) dropwise. The solution was heated to 40° C. for 2 h. The solvent was removed in vacuo, and EtOH (20 mL), iron powder (200 mg, 3 mmol) and conc. HCl (8 drops) were added. The mixture was heated to 75° C. for 1 h. The material was loaded into a SCX cartridge, washed with MeOH and ejected with 2M NH3 in MeOH. The filtrate was concentrated in vacuo to afford the title compound as a dark orange solid, and was used in the next step without further purification. MS (ES+): m/z 317.02 (100) [MH+]. HPLC: tR=1.83 min (ZQ3, polar—5 min).

Provenance & Evidence