Triethylamine → HCID 131736295, compound

Participants

Reaction Steps

To a solution of trans-1-tert-butyl 4-ethyl 3-aminopiperidine-1,4-dicarboxylate 7 (2.5 g, 9.2 mmol, 1.0 equiv) in CH2Cl2 (50 mL), Et3N (2.5 mL, 18.4 mmol, 2.0 equiv) was added at rt. After the reaction solution was stirred at rt for 10 min, 5-bromovaleryl chloride (1.9 g, 9.6 mmol, 1.05 eq) was added. The reaction solution was stirred at rt for 2 h. The mixture was quenched with H2O (20 mL) and extracted with CH2Cl2 (50 mL×3). The organic layer was collected, concentrated in vacuo, and the residue was purified by column chromatography (silica, petroleum ether/EtOAc=1:1) to give (trans)-1-tert-butyl 4-ethyl 3-(5-bromopentanamido)piperidine-1,4-dicarboxylate 8 as yellow oil (3.2 g, yield: 80%). ESI-MS (M+H-56)+: 379.0. 1H NMR (400 MHz, CDCl3) δ: 5.99 (d, 1H), 4.39-4.38 (m, 1H), 4.15 (q, 2H), 3.79-3.74 (m, 1H), 3.66-3.60 (m, 1H), 3.41 (t, 2H), 3.30-3.26 (m, 1H), 3.21-3.14 (m, 1H), 2.78-2.74 (m, 1H), 2.19 (t, 2H), 1.99-1.85 (m, 3H), 1.80-1.72 (m, 3H), 1.45 (s, 9H), 1.27 (t, 3H).

Provenance & Evidence