Water → tert-butyl N-[4-(4-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidin-5-yl)-2-methoxyphenyl]carbamate

Participants

Reaction Conditions

Reaction Steps

A mixture of water (25 ml) and tert-butyl N-[2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]carbamate (65% pure) (4.25 g, 7.92 mmol) was frozen and subjected to vacuum followed by filling with nitrogen while defreezing. 4-Chloro-7-cyclopentyl-5-iodo-7H-pyrrolo[2,3-d]pyrimidine (1.83 g, 5.28 mmol), tetrakis (triphenylphosphine)palladium(0) (0.37 g, 0.32 mmol), sodium carbonate (1.40 g, 13.20 mmol) and ethylene glycol dimethyl ether (50 ml) were added and the resulting mixture was heated at 80° C. under an atmosphere of nitrogen overnight. The mixture was allowed to cool to ambient temperature and the solvent was removed under reduced pressure to give a residue which was partitioned between water and ethyl acetate. The organic layer was separated and the aqueous layer was further extracted with ethyl acetate twice. The combined ethyl acetate extracts were dried over magnesium sulfate and evaporated to give a dark oil which was purified by flash column chromatography on silica using n-heptane/ethyl acetate (3:1) with 2% triethylamine as the mobile phase. Appropriate fractions were collected, combined and concentrated to give tert-butyl N-[4-(4-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidin-5-yl)-2-methoxyphenyl]carbamate as white solids (1.90 g, 4.29 mmol): 1H NMR (DMSO-d6, 400 MHz) δ 8.65 (s, 1H), 7.94 (s, 2H), 7.74 (d, 1H), 7.19 (d, 1H), 7.07 (dd, 1H), 5.22 (m, 1H), 3.87 (s, 3H), 2.19 (m, 2H), 1.99 (m, 2H), 1.91 (m, 2H), 1.73 (m, 2H), 1.48 (s, 9H); TLC (n-heptane/ethyl acetate=1:1) Rf 0.58.

Provenance & Evidence