Hydrochloric Acid → 2-Tert-butoxy-2-[4-(4-chlorophenyl)-1-[[1-(2-hydroxyethyl)triazol-4-yl]methyl]-6-methyl-7-oxo-pyrrolo[2,3-c]pyridin-5-yl]acetic acid

Participants

Reaction Steps

A suspension of methyl 2-(tert-butoxy)-2-(4-(4-chlorophenyl)-6-methyl-7-oxo-1-(prop-2-yn-1-yl)-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetate (20 mg, 0.045 mmol), 2-azidoethyl acetate (8.53 μL, 0.074 mmol), copper(II) sulfate pentahydrate (1.240 mg, 4.96 μmol) and L-(+)-ascorbic acid (0.874 mg, 4.96 μmol) in Ethanol (1.000 mL) and Water (0.2 mL) was irradiated in the microwave at 120° C. for 20 minutes. The mixture was diluted with Methanol (1.000 mL), and Tetrahydrofuran (THF) (1.000 mL), treated with 2M LiOH (1 mL, 2.000 mmol) and then stirred at ambient temperature overnight. The mixture was treated with 1M HCl until pH<2, extracted with ethyl acetate, concentrated and purified by reverse phase chromatography (10-90% MeCN/H2O-0.1% TFA, 12 min) to afford 2-(tert-butoxy)-2-(4-(4-chlorophenyl)-1-((1-(2-hydroxyethyl)-1H-1,2,3-triazol-4-yl)methyl)-6-methyl-7-oxo-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetic acid (4.3 mg, 0.08 mmol, 7% yield) as a white solid. 1H NMR (400 MHz, CHLOROFORM-d) ppm 7.88-7.83 (m, 1H), 7.62-7.56 (m, 1H), 7.50-7.44 (m, 2H), 7.41-7.36 (m, 1H), 7.34-7.31 (m, 1H), 7.23-7.20 (m, 1H), 6.07-5.99 (m, 1H), 5.99-5.94 (m, 1H), 5.78-5.69 (m, 1H), 5.37-5.32 (s, 1H), 4.49-4.43 (m, 2H), 4.09-4.04 (m, 2H), 3.67 (s, 3H), 1.02 (s, 9H); LCMS (m/z) ES+=514 (M+1).

Provenance & Evidence