Triethyl phosphite → tert-butyl(1-(4-(2-methyl-8-phenyl-4,5-dihydro-3H-imidazo[4,5-f]quinolin-7-yl)phenyl)cyclobutyl)carbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl(1-(4-(3-hydroxy-2-methyl-8-phenyl-4,5-dihydro-3H-imidazo[4,5-f]quinolin-7-yl)phenyl)cyclobutyl)carbamate (276 mg, 0.528 mmol) in anhydrous DMF (1.4 mL) was added triethyl phosphite (181 μl, 1.056 mmol) and heated to 100° C. under a nitrogen atmosphere overnight. The reaction mixture was allowed to cool to room temperature, diluted with 50:50 water:brine (10 mL) and extracted into ethyl acetate (3×5 mL). The combined organic phases were washed with 50:50 water:brine (2×10 mL), brine (10 mL) dried over Na2SO4, filtered and concentrated to dryness under reduced pressure. The residue was purified via Biotage chromatography (silica, DCM:MeOH, gradient elution from 100:0 to 90:10) to give the desired product as a pale brown solid (100 mg, 37% yield). 1H-NMR (500 MHz, CDCl3) δ 7.74 (1H, s), 7.28 (2H, d), 7.23 (2H, d), 7.13-7.17 (3H, m), 7.06-7.11 (2H, m), 5.09 (1H, br s), 3.25 (2H, t), 2.92 (2H, t), 2.16-2.59 (4H, br m), 2.41 (3H, s), 1.95-2.08 (1H, m), 1.70-1.82 (1H, m), 1.05-1.47 (9H, br m). LCMS (Method A) RT=4.66 min, M+H+=507.20.

Provenance & Evidence