1,3-Dibromopropane → 9-(5-Chloro-2-methoxy-benzenesulfonyl)-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocycloheptene-2-carboxylic acid methyl ester

HRID 641309Notes

Reaction equation

C(=O)([O-])[O-].[K+].[K+].[CH3:7][O:8][C:9](=[O:30])[C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[C:12]([NH:17][S:18]([C:21]2[CH:26]=[C:25]([Cl:27])[CH:24]=[CH:23][C:22]=2[O:28][CH3:29])(=[O:20])=[O:19])[CH:11]=1.Br[CH2:32][CH2:33][CH2:34]Br>CN(C)C=O>[CH3:7][O:8][C:9]([C:10]1[CH:15]=[CH:14][C:13]2[O:16][CH2:34][CH2:33][CH2:32][N:17]([S:18]([C:21]3[CH:26]=[C:25]([Cl:27])[CH:24]=[CH:23][C:22]=3[O:28][CH3:29])(=[O:19])=[O:20])[C:12]=2[CH:11]=1)=[O:30]

Participants

Conditions

Temperature: 60 °C

Procedure

Potassium carbonate (818 mg, 5.92 mmol) was added to a solution of 3-(5-chloro-2-methoxy-benzenesulfonylamino)-4-hydroxy-benzoic acid methyl ester (example 30, step 1; 1.00 g, 2.69 mmol) and 1,3-dibromopropane (597 mg, 2.96 mmol) in N,N-dimethylformamide (17 mL), and the suspension was heated at 60° C. for 5 h, then the reaction mixture was partitioned between water and ethyl acetate. The organic layer was washed with brine, dried (MgSO4), and evaporated. Chromatography (SiO2, heptane-ethyl acetate gradient) produced 9-(5-chloro-2-methoxy-benzenesulfonyl)-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocycloheptene-2-carboxylic acid methyl ester (996 mg, 90%). White solid, MS (ISP)=412.1 (M+H)+.

Workup

customthe reaction mixture was partitioned between water and ethyl acetate
washThe organic layer was washed with brine
dry with materialdried (MgSO4)
customevaporated

Sources & evidence

ORD record: ord-caf5b683f6d14f06acbd94b2f6bae26c
Source dataset: uspto-grants-2010_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07696200B2

Reaction notes

Loading…