Tetrabutylammonium Fluoride → 3-(3-Hydroxy-3-methylbut-1-ynyl)-9H-dipyrido[2,3-b;4',3'-d]pyrrole-6-carbonitrile

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Reaction Conditions

Reaction Steps

A solution of 3-(3-hydroxy-3-methylbut-1-ynyl)-9-(2-trimethylsilanyl-ethoxymethyl)dipyrido[2,3-b;4′,3′-d]pyrrole-6-carbonitrile (254 mg, 0.624 mmol) in THF (12 mL) was treated with TBAF (3.7 mL, 12.5 mmol) and heated to 60° C. for 24 h. The reaction mixture was allowed to cool to ambient temperature and the solvent removed in vacuo. The resultant residue was dissolved in DCM, absorbed onto silica gel, and purified by flash chromatography (Biotage, 25 g, 1-100% EtOAc in heptane). The light orange solid was further purified by preparative HPLC (5-85% MeCN in water (0.1% NH4OH) over 30 min, 35 mL/min) to afford the title compound as an off-white solid (21 mg, 12%). 1H NMR (DMSO-D6, 400 MHz,): 12.99 (s, 1H), 9.04 (s, 1H), 8.93 (s, 1H), 8.86 (d, J=2.0 Hz, 1H), 8.69 (d, J=2.0 Hz, 1H), 5.53 (s, 1H), 1.55 (s, 6H). LCMS (Method D): RT=9.66 min, M+H+=277.

Provenance & Evidence