Ethyl 2-oxocyclopentanecarboxylate → 2-(Cyclobutylmethyl-amino)-cyclopentanecarboxylic acid ethyl ester

Temperatur

25 °C

2-Oxo-cyclopentanecarboxylic acid ethyl ester (0.24 mL, 1.64 mmol) and C-cyclobutyl-methylamine hydrochloride (0.20 g, 1.64 mmol) were dissolved in methanol (8 mL). Sodium acetate (0.27 g, 3.28 mmol) was added followed by 4 Å powdered molecular sieves (0.20 g) and sodium cyanoborohydride (0.21 g, 3.28 mmol). The reaction was stirred at 25° C. for 16 h. The mixture was poured into a mixture of saturated aqueous sodium bicarbonate solution (20 mL) and ethyl acetate (30 mL). After shaking, both layers were passed through a plug of Celite. The organic layer was further washed with saturated aqueous sodium bicarbonate solution (10 mL), saturated aqueous brine solution (10 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to afford the crude product, 2-(cyclobutylmethyl-amino)-cyclopentanecarboxylic acid ethyl ester (0.29 g, 1.30 mmol, 79%) as a clear oil. LC-MS (ESI) calcd for C13H23NO2 225.33, found 226.2 [M+H+].

1. stirringAfter shaking
2. washThe organic layer was further washed with saturated aqueous sodium bicarbonate solution (10 mL), saturated aqueous brine solution (10 mL)
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo

ORD-Eintrag

ord-39d5dcb038e94f0c92c9043f90f7fa5c

Quelldatensatz

uspto-grants-2009_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07582626B2