Cesium carbonate → HCID 86604640, compound

HRID 1593301Notes

Reaction equation

HRID 1593301 reaction equation
[O:1]=[C:2]1[NH:8][C:7]2[CH:9]=[CH:10][CH:11]=[CH:12][C:6]=2[O:5][C@H:4]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[C@@H:3]1[NH:19][C:20](=[O:26])[O:21][C:22]([CH3:25])([CH3:24])[CH3:23].Br[CH2:28][CH:29]1[CH2:31][CH2:30]1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[CH:29]1([CH2:28][N:8]2[C:7]3[CH:9]=[CH:10][CH:11]=[CH:12][C:6]=3[O:5][C@H:4]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[C@H:3]([NH:19][C:20](=[O:26])[O:21][C:22]([CH3:23])([CH3:25])[CH3:24])[C:2]2=[O:1])[CH2:31][CH2:30]1

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 81503BromomethylcyclopropaneHCID 59863952HCID 59863952, compound

Product 1

HCID 86604640HCID 86604640, compoundYield 92%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a stirred solution of tert-butyl [(2R,3S)-4-oxo-2-phenyl-2,3,4,5-tetrahydro-1,5-benzoxazepin-3-yl]carbamate (67a) (190 mg, 0.536 mmol) in dry DMF (2 mL) under nitrogen was added (bromomethyl)cyclopropane (108 mg, 0.800 mmol) and powdered cesium carbonate (264 mg, 0.810 mmol). The mixture was stirred overnight at ambient temperature then diluted with ewater and extracted with ethyl acetate three times. The residue from the combined organic extracts was purified by flash chromatography on silica gel eluting with 6:1 (v/v) hexane:ethyl acetate to afford the title compound (201 mg, 92%) as a white solid. TLC Rf=0.31 (6:1 hexane:ethyl acetate). 1H NMR (300 MHz, CDCl3) δ0.19 (m, 1H), 0.35-0.62 (m, 3H), 1.15 (m, 1H), 1.37 (s, 9H), 3.50 and 3.55 (dd, 1H, J=7.0 Hz), 4.12 and 4.17 (dd, 1H, J=7.0 Hz), 4.93 (m, 2H), 5.65 (d, 1H, J=7.0 Hz), 7.29 (m, 4H), 7.41 (m, 5H). MS APCI, m/z=309 (M-BOC). LC/MS: 3.08 min.

Workup

  1. additionthen diluted with ewater
  2. extractionextracted with ethyl acetate three times
  3. customThe residue from the combined organic extracts was purified by flash chromatography on silica gel eluting with 6:1 (v/v) hexane

Sources & evidence

ORD record
ord-e41c7aeebce8432c92979f55823b9c4f
Source dataset
uspto-grants-2007_11
Patent number
US07294622B2

Reaction notes

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