Dimethylformamide → furan-2-carboxylic acid (7-benzo[b]thiophen-2-yl-1H-indazol-5-yl)-amide

Participants

Reaction Steps

In a 20 mL vial, a solution of N-methylmorpholine (0.060 g, 0.60 mmol) in MeCN/CH2Cl2 (1:1, 0.688 mL) was added to Si-dichlorotriazine (SiliCycle, Inc; 0.60 mmol/g, 0.74 g, 0.44 mmol). Then, a solution of 2-furoic acid (0.021 g, 0.19 mmol) in MeCN (0.925 mL) was added and mixed for about 1 min., prior to the addition of a solution of 7-benzo[b]thiophen-2-yl-1H-indazol-5-ylamine (Example #F.8.1, 0.039 g, 0.15 mmol) in MeCN/CH2Cl2 (1:1, 0.688 mL). The reaction mixture was shaken at ambient temperature for about 16 hours. The crude reaction solution was mixed with DMF (5 mL) to aid in solubility, eluted through a Si-carbonate (SiliCycle, Inc; 1 g, 6 mL) cartridge using MeOH (approx 3 mL), and concentrated in vacuo. The crude product was then purified by preparative HPLC (Waters Symmetry C8 column (25×100 mm, 7 μm particle size) using a gradient of 10%-100% CH3CN/0.1% aqueous TFA over 8 min (10 min run time) at a flow rate of 40 mL/min) to afford furan-2-carboxylic acid (7-benzo[b]thiophen-2-yl-1H-indazol-5-yl)-amide (0.0025 g, 4.7%); RP-HPLC (Table 1, Method 1) Rt 2.51 min; m/z: (M+H)+ 360.

Provenance & Evidence