Water → 4-[2-(4-Fluoro-phenylamino)-imidazo[2,1-b][1,3,4]thiadiazol-5-yl]-phenol

HRID 1043662Notes

Reaction equation

[F:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9]2[S:13][C:12]3=[N:14][CH:15]=[C:16](I)[N:11]3[N:10]=2)=[CH:4][CH:3]=1.[OH:18][C:19]1[CH:24]=[CH:23][C:22](B(O)O)=[CH:21][CH:20]=1.C(=O)([O-])[O-].[Cs+].[Cs+].O>O1CCOCC1.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[F:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9]2[S:13][C:12]3=[N:14][CH:15]=[C:16]([C:22]4[CH:23]=[CH:24][C:19]([OH:18])=[CH:20][CH:21]=4)[N:11]3[N:10]=2)=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 140 °C

Procedure

(4-Fluoro-phenyl)-(5-iodo-imidazo[2,1-b][1,3,4]thiadiazol-2-yl)-amine (0.065 g, 0.18 mmol) was suspended in 1,4-dioxane (1 mL) at room temperature, and argon was bubbled into the mixture while tetrakis(triphenylphosphine)-palladium(0) (21 mg, 0.018 mmol), 4-hydroxyphenylboronic acid (21 mg, 0.21 mmol), cesium carbonate (118 mg, 0.36 mmol) and water (1 mL) were added. The mixture was deoxygenated for 10 minutes and heated under microwave irradiation at 140° C. for 30 minutes. On cooling, the mixture was diluted with dichloromethane (5 mL), adsorbed in silica and purified by column chromatography (Biotage™/Flash, silica, methanol:dichloromethane 0.4:9.6 to 1:9) to give 4-[2-(4-fluoro-phenylamino)-imidazo[2,1-b][1,3,4]thiadiazol-5-yl]-phenol as a beige solid (21 mg, 36% yield).

Workup

additionwere added
customThe mixture was deoxygenated for 10 minutes
temperatureOn cooling
additionthe mixture was diluted with dichloromethane (5 mL)
custompurified by column chromatography (Biotage™/Flash, silica, methanol:dichloromethane 0.4:9.6 to 1:9)

Sources & evidence

ORD record: ord-329077fb1ec24819bbf634ff98a09a15
Source dataset: uspto-grants-2013_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08563550B2

Reaction notes

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