Triethylamine → Tert-butyl 3-methyl-1H-pyrazolo[3,4-B]pyridine-1-carboxylate

関与物質

反応手順

A stirred solution of 692 mg (5.20 mmol) of 3-methyl-1H-pyrazolo[3,4-b]pyridine in 25 mL of acetonitrile under nitrogen was cooled to 0° C. in an ice bath, and was treated with 635 mg (5.20 mmol) of DMAP and 761 μL (5.46 mmol) of triethylamine. A solution of 1.36 g (6.24 mmol) of (BOC)2O in 5 mL acetonitrile was then added dropwise using an addition funnel. Upon completion of addition, the ice bath was removed and the mixture was stirred for an additional 18 hours at room temperature. Solvent was removed in vacuo, and the residue was partitioned between EtOAc and H2O. The organic layer was separated, dried (MgSO4), filtered and concentrated in vacuo to an orange oil. This crude material was purified by flash chromatography over silica gel with 1:1 ethyl acetate/hexanes to give the title product as a clear oil. 1H NMR (CDCl3): δ 1.74 (s, 9H), 2.60 (s, 3H), 7.29 (m, 1H), 8.02 (dd, 1H), 8.74 (dd, 1H).

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