2-Bromoethanol → Methyl(3S,4R)-4-{[(benzyloxy)carbonyl]amino}-1-(2-hydroxyethyl)piperidine-3-carboxylate

HRID 255191Notes

Reaction equation

[CH2:1]([O:8][C:9]([NH:11][C@@H:12]1[CH2:17][CH2:16][NH:15][CH2:14][C@@H:13]1[C:18]([O:20][CH3:21])=[O:19])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(N(CC)C(C)C)(C)C.Br[CH2:32][CH2:33][OH:34]>C(#N)C>[CH2:1]([O:8][C:9]([NH:11][C@@H:12]1[CH2:17][CH2:16][N:15]([CH2:32][CH2:33][OH:34])[CH2:14][C@@H:13]1[C:18]([O:20][CH3:21])=[O:19])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of methyl (3S,4R)-4-{[(benzyloxy)carbonyl]amino}piperidine-3-carboxylate (WO 2005/066176) (2.29 g, 7.83 mmol), N,N-diisopropylethylamine (2.05 mL, 11.75 mmol and 2-bromoethanol (0.722 mL, 10.18 mmol) in dry acetonitrile (17 mL) was heated in the microwave at 70° C. for 4.5 hours. The solvent was removed under reduced pressure and the residue taken up in ethyl acetate (200 mL) and washed with saturated aqueous sodium hydrogencarbonate solution (100 mL). The aqueous phase was back extracted once with ethyl acetate (100 mL) and the combined organic phases were dried over sodium sulfate. Chromatography on silica gel with dichloromethane/methanol (12:1) gave 2.0 g (76%), mp 73° C.

Workup

customThe solvent was removed under reduced pressure
washwashed with saturated aqueous sodium hydrogencarbonate solution (100 mL)
extractionThe aqueous phase was back extracted once with ethyl acetate (100 mL)
dry with materialthe combined organic phases were dried over sodium sulfate
customChromatography on silica gel with dichloromethane/methanol (12:1) gave 2.0 g (76%), mp 73° C.

Sources & evidence

ORD record: ord-6e09009c90c94e7180de810b88119332
Source dataset: uspto-grants-2011_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07875715B2

Reaction notes

Loading…