Lawesson's reagent → tert-butyl (6R,7R)-6-(2-amino-2-thioxoethyl)-7-(3,4-dichlorophenyl)-1,4-oxazepane-4-carboxylate

HRID 1022709Notes

Reaction equation

[NH2:1][C:2](=O)[CH2:3][C@H:4]1[C@H:10]([C:11]2[CH:16]=[CH:15][C:14]([Cl:17])=[C:13]([Cl:18])[CH:12]=2)[O:9][CH2:8][CH2:7][N:6]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:5]1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:36])=CC=1.C(=O)([O-])O.[Na+]>C1COCC1>[NH2:1][C:2](=[S:36])[CH2:3][C@H:4]1[C@H:10]([C:11]2[CH:16]=[CH:15][C:14]([Cl:17])=[C:13]([Cl:18])[CH:12]=2)[O:9][CH2:8][CH2:7][N:6]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:5]1

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of tert-butyl (6R,7R)-6-(2-amino-2-oxoethyl)-7-(3,4-dichlorophenyl)-1,4-oxazepane-4-carboxylate (528 mg, 1.31 mmol) in THF (6 mL) was added Lawesson's reagent (794 mg, 1.96 mmol), and the mixture was stirred at 70° C. for 2.5 hr. To the reaction mixture was added aqueous sodium hydrogen carbonate solution, and the mixture was extracted with ethyl acetate. The extract was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography to give the title compound (289 mg).

Workup

extractionthe mixture was extracted with ethyl acetate
washThe extract was washed with brine
dry with materialdried over anhydrous sodium sulfate
customThe solvent was evaporated under reduced pressure
customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record: ord-b37be795f45848149a18fe99d7eb2b99
Source dataset: uspto-grants-2014_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08722662B2

Reaction notes

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