Cesium fluoride → Tert-butyl 3-(4-(methylsulfonyl)phenyl)-1,2,4-thiadiazol-5-ylcarbamate

HRID 2190308Notes

Reaction equation

Br[C:2]1[N:6]=[C:5]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[S:4][N:3]=1.[CH3:15][S:16]([C:19]1[CH:24]=[CH:23][C:22](B(O)O)=[CH:21][CH:20]=1)(=[O:18])=[O:17].[F-].[Cs+].O1CCOCC1>[Pd].O>[CH3:15][S:16]([C:19]1[CH:24]=[CH:23][C:22]([C:2]2[N:6]=[C:5]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[S:4][N:3]=2)=[CH:21][CH:20]=1)(=[O:18])=[O:17]

Participants

Conditions

Temperature: 80 °C

Procedure

To a mixture of tert-butyl 3-bromo-1,2,4-thiadiazol-5-ylcarbamate (1.90 g, 6.78 mmol), 4-(methylsulfonyl)phenylboronic acid (2.07 g, 10.3 mmol), cesium fluoride (2.09 g, 13.8 mmol), and the palladium catalyst (0.271 g, 0.383 mmol) was added dioxane (20 mL) and water (2 mL). The reaction mixture was degassed by bubbling nitrogen through the solution for 5 min and the reaction mixture was heated to 80° C. for 3 h. The reaction mixture was diluted with EtOAc, and the organic phase was washed with saturated NH4Cl (1×), brine (1×), dried over MgSO4, filtered, and concentrated. Purification by flash column chromatography on silica gel (eluted with 10% to 50% EtOAc in hexanes) gave tert-butyl 3-(4-(methylsulfonyl)phenyl)-1,2,4-thiadiazol-5-ylcarbamate.

Workup

customThe reaction mixture was degassed
customby bubbling nitrogen through the solution for 5 min
additionThe reaction mixture was diluted with EtOAc
washthe organic phase was washed with saturated NH4Cl (1×), brine (1×)
dry with materialdried over MgSO4
filtrationfiltered
concentrationconcentrated
customPurification by flash column chromatography on silica gel (eluted with 10% to 50% EtOAc in hexanes)

Sources & evidence

ORD record: ord-5eeca1c9b6e1420caeeeb9e33f8e424e
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08324396B2

Reaction notes

Loading…