4-Cyanophenylboronic acid → HCID 11477668, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-[3-formyl-1-(4-iodophenyl)-1H-indol-2-yl]-piperazine-1-carboxylic acid tert-butyl ester (294 mg, 0.553 mmol) and Pd(PPh3)4 (32 mg, 0.0277 mmol) are placed in a side-armed test tube and flushed with N2. Tetrahydrofuran (6.0 mL) and 1M aq potassium carbonate (0.6 mL) are added followed by a solution of 4-cyanobenzeneboronic acid (122 mg, 0.830 mmol) in THF (2.0 mL). After stirring at 70° C. for 8 hr the reaction is cooled, then dissolved in ethyl acetate, washed with water (2×10 mL), with brine, dried over sodium sulfate, filtered and concentrated. The residue is purified by chromatography eluting with heptane-10 to 40% ethyl acetate. Product containing fractions are combined and concentrated to afford 4-[1-(4′-cyanobiphenyl-4-yl)-3-formyl-1H-indol-2-yl]-piperazine-1-carboxylic acid tert-butyl ester as a yellow solid. TLC (heptane-30% ethyl acetate); RT 0.13; ESI/MS 451 [M-C(CH3)3]; NMR (CDCl3) 10.30 (1H, s); 8.28 (1H, d, J=9 Hz); 7.84 (6H, m); 7.55 (2H, d); 7.29 (3H, m); 3.34 (8H, m); 1.44 (9H, s).

Provenance & Evidence