Triethylamine → N'-hydroxy-3-iodo-1-tosyl-1H-indole-5-carboximidamide

Participants

Reaction Steps

To a suspension of 3-iodo-1-tosyl-1H-indole-5-carbonitrile (1 g, 2.37 mmol) in EtOH (10 mL) was added Et3N (1.65 mL, 11.87 mmol) followed by NH2OH.HCl (410 mg, 5.93 mmol) and the reaction was stirred for 48 h at RT. The solvent was removed in vacuo and the residue was treated with H2O (10 mL) and extracted with EtOAc (25 mL). The aqueous layer was extracted with EtOAc (25 mL). The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated. The residue was further triturated with n-pentane to give N′-hydroxy-3-iodo-1-tosyl-1H-indole-5-carboximidamide (950 mg, 88.7%) as an off brown solid. MS (ESI, pos. ion) m/z: 455.8; 1H NMR (400 MHz, CDCl3): δ 7.99 (d, J=8.8 Hz, 1H), 7.84-7.73 (m, 4H), 7.68 (d, J=8.4 Hz, 1H), 7.63-7.61 (m, 1H), 7.31-7.24 (m, 1H), 4.92 (brs, 2H), 3.14-3.09 (m, 1H), 2.36 (s, 3H).

Provenance & Evidence