Ammonium Chloride → 1-(2-Fluoro-benzyl)-[5-(1H-pyrrolo[2,3-b]pyridine-3-carbonyl)-pyridin-2-yl]-carbamic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

To 3-iodo-1-triisopropylsilanyl-1H-pyrrolo[2,3-b]pyridine (96, 0.550 g, 1.37 mmol) in tetrahydrofuran (15.0 mL) at −40° C. under nitrogen, isopropylmagnesium chloride (2.0 M in tetrahydrofuran, 0.65 mL) was added slowly. The reaction was allowed to warm to 5° C. over 70 minutes, then cooled to −40° C., followed by adding (2-fluoro-benzyl)-(5-formyl-pyridin-2-yl)-carbamic acid tert-butyl ester (579, prepared according to the protocol of Example 17, Scheme 19, Steps 1-3, replacing 4-chlorobenzaldehyde 40 with 2-fluoro-benzaldehyde in Step 1) in tetrahydrofuran (4.0 mL). The reaction was allowed to warm to room temperature over 1 hour, then poured into aqueous ammonium chloride, and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate w as concentrated and purified by silica gel column chromatography eluting with 20% to 100% ethyl acetate in hexane to give the desired compound (580, 0.14 g, 26%). MS (ESI) [M+H+]+=447.0.

Provenance & Evidence