tert-Butyl 4-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate → HCID 58556833, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 28 (7.3 mmol) in THF was added 1.6 N butyllithium/hexane solution (7 ml) at −78° C. under N2 atmosphere. The solution was stirred at −78° C. for 1 hour and a solution of tert-butyl 4-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate (1 g, 3.6 mmol) in THF was added. The solution was maintained at −78° C. for 4 hour, and then quenched with sat. aqueous NH4Cl and allowed to warm to rt with stirring. The organic layer was separated and then the aqueous layer was extracted with ethyl acetate. The combine extract was washed with water, dried over Na2SO4, filtered, concentrated, and the residue chromatographed on silica eluted with an ethyl acetate-hexane (1:4, v/v) and the aimed product was obtained. The yield was 40%. NMR (CDCl3): δ 1.47 (s, 9H), 1.62-1.70 (m, 4H), 2.83 (s, 2H), 3.64-3.73 (m, 1H), 4.17 (br, 2H), 4.25-4.36 (m, 2H), 4.68-4.87 (m, 2H), 7.23-7.26 (m, 1H), 7.38-7.40 (m, 1H), 8.25-8.30 (m, 1H).

Provenance & Evidence