Diisopropylethylamine → tert-Butyl [(3S)-1-(5-nitro-2,3-dihydrofuro[2,3-b]pyridin-4-yl)piperidin-3-yl]carbamate

HRID 924415Notes

Reaction equation

I[C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][N:5]=[C:4]2[O:11][CH2:12][CH2:13][C:3]=12.[NH:14]1[CH2:19][CH2:18][CH2:17][C@H:16]([NH:20][C:21](=[O:27])[O:22][C:23]([CH3:26])([CH3:25])[CH3:24])[CH2:15]1.CCN(C(C)C)C(C)C>CCO>[N+:8]([C:7]1[C:2]([N:14]2[CH2:19][CH2:18][CH2:17][C@H:16]([NH:20][C:21](=[O:27])[O:22][C:23]([CH3:25])([CH3:24])[CH3:26])[CH2:15]2)=[C:3]2[CH2:13][CH2:12][O:11][C:4]2=[N:5][CH:6]=1)([O-:10])=[O:9]

Participants

Conditions

Temperature: 100 °C

Procedure

A microwave vial containing 4-iodo-5-nitro-2,3-dihydrofuro[2,3-b]pyridine (2.05 g, 7.02 mmol), tert-butyl (3S)-piperidin-3-ylcarbamate (Combi-Blocks, 1.489 g, 7.435 mmol), DIPEA (1.836 g, 14.20 mmol) and EtOH (12.0 mL) was heated under microwave irradiation at 100° C. for 2 h. The reaction was then concentrated under reduced pressure. The resulting residue was purified by flash chromatography on silica gel (0-100% EtOAc in hexanes) to give the sub-title compound as a yellow solid (2.46 g, 96%). LCMS calc. for C17H25N4O5 (M+H)+: m/z=365.2. found 365.1.

Workup

concentrationThe reaction was then concentrated under reduced pressure
customThe resulting residue was purified by flash chromatography on silica gel (0-100% EtOAc in hexanes)

Sources & evidence

ORD record: ord-902c9787e9f94c9290ec3b7d1971ccb1
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09278950B2

Reaction notes

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