Potassium Carbonate → methyl 2-(tert-butoxy)-2-(1-(4-chloro-3-fluorobenzyl)-6-methyl-7-oxo-4-(p-tolyl)-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetate

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Reaction Steps

An ice cold solution of methyl 2-(tert-butoxy)-2-(6-methyl-7-oxo-4-(p-tolyl)-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetate (21 mg, 0.055 mmol) in N,N-Dimethylformamide (DMF) (500 μl) was treated with K2CO3 (37.9 mg, 0.275 mmol), DIEA (47.9 μl, 0.275 mmol), and 4-chloro-3-fluorobenzyl bromide (61.4 mg, 0.275 mmol), stirred at rt for 1 hr, and then heated to 70° C. for 18 hours. The reaction was diluted with water, extracted with EtOAc, washed with Brine, dried with Na2SO4, filtered, and concentrated. Purification with column chromatography (0-100% EtOAc/hexane) gave methyl 2-(tert-butoxy)-2-(1-(4-chloro-3-fluorobenzyl)-6-methyl-7-oxo-4-(p-tolyl)-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetate (26.2 mg, 0.050 mmol, 91% yield) as clear oil. The ester intermediate was dissolved in Methanol (500 μl) and Tetrahydrofuran (THF) (500 μl), treated with 2M LiOH (150 μl, 0.3 mmol), and stirred at 60° C. for 2.5 hours. The reaction was concentrated and purified with reverse phase HPLC (20-100% MeCN/H2O-0.1% TFA, 12 min) to give title compound (11.6 mg, 0.022 mmol, 40.9% yield) as white solid: 1H NMR (400 MHz, CHLOROFORM-d) ppm 0.99 (s, 9H), 2.43 (s, 3H), 3.65 (s, 3H), 5.46 (s, 1H), 5.79 (d, J=2.3 Hz, 2H), 6.06 (d, J=2.8 Hz, 1H), 6.94-7.07 (m, 3H), 7.24-7.31 (m, 2H), 7.30-7.38 (m, 2H), 7.49-7.56 (m, 1H); LCMS (m/z) ES+=511 (M+1).

Provenance & Evidence