Water → Tert-butyl 4-((1,3-dioxoisoindolin-2-yl)methyl)-4-fluoropiperidine-1-carboxylate

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Reaction Conditions

Reaction Steps

To a solution of 3-2 (6.78 g, 17.5 mmol) in 70 mL DMF was added potassium phthalimide (4.21 g, 22.7 mmol) and the mixture was heated at 150° C. for 2.5 h. The mixture was allowed to cool to ambient temperature, poured into H2O (150 mL), and extracted with EtOAc (3×150 mL). The combined organic layers were washed with brine (200 mL), dried over MgSO4, filtered, and concentrated in vacuo, giving 11.0 g of crude 3-3 as a tan solid. 1H NMR (CDCl3, 300 MHz): 7.85 (dd, J=5.4, 3.0 Hz, 2H), 7.76 (dd, J=5.4, 3.0 Hz, 2H), 3.96 (br, 2H), 3.04 (m, 2H), 1.70 (m, 6H), 1.43 (s, 9H); MS (Electrospray): m/z 385.2 (M+Na), 347.3 (M−Me+H).

Provenance & Evidence