Ethyl Acetate → 4-(5-Methyl-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

To a solution of 4-Chloro-7-(4-methoxy-benzyl)-5-methyl-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidine (0.55 g, 1.88 mmol) in NMP (20 mL) were added 1-Boc-piperazine (1.0 g, 5.40 mmol) and tBuOK (0.21 g, 1.88 mmol). The mixture was heated to 128° C. for 30 hours. After cooling, the mixture was diluted by ethyl acetate (500 mL) and washed with water (5×150 mL). The organic phase was dried and concentrated. The residue was subject to column chromatography, eluted by hexane/ethyl acetate (1:1) to give 4-(5-Methyl-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester (0.30 g, 36%). 1H NMR (CDCl3, 400 MHz) δ 8.19 (s, 1H), 7.18 (d, J=8.4 Hz, 2H), 6.84 (d, J=8.4 Hz, 2H), 4.52 (dd, J=27.6 Hz, J=14.8 Hz, 2H), 3.79 (s, 3H), 3.58 (m, 12H), 3.34 (m 1H), 2.95 (m, 1H), 1.48 (s, 9H), 1.15 (d, J=6.8 Hz, 3H). MS (APCI+) [M+H]+440.

Provenance & Evidence