Lithium Hexamethyldisilazide → 5-cyclopropanesulfonyl-8-fluoro-7-(2-fluoro-4-iodophenyl)-2,3-dimethyl-2,7-dihydro-5H-imidazo[4,5-f]indazol-6-one

HRID 1161822Notes

Reaction equation

[F:1][C:2]1[C:10]2[C:6](=[C:7]([CH3:12])[N:8]([CH3:11])[N:9]=2)[CH:5]=[C:4]2[NH:13][C:14](=[O:24])[N:15]([C:16]3[CH:21]=[CH:20][C:19]([I:22])=[CH:18][C:17]=3[F:23])[C:3]=12.[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[CH:35]1([S:38](Cl)(=[O:40])=[O:39])[CH2:37][CH2:36]1>C1COCC1>[CH:35]1([S:38]([N:13]2[C:4]3=[CH:5][C:6]4[C:10]([C:2]([F:1])=[C:3]3[N:15]([C:16]3[CH:21]=[CH:20][C:19]([I:22])=[CH:18][C:17]=3[F:23])[C:14]2=[O:24])=[N:9][N:8]([CH3:11])[C:7]=4[CH3:12])(=[O:40])=[O:39])[CH2:37][CH2:36]1

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 8-fluoro-7-(2-fluoro-4-iodophenyl)-2,3-dimethyl-2,7-dihydro-5H-imidazo[4,5-f]indazol-6-one (34 mg, 0.077 mmol) in THF (5 ml) at −78° C. was added LiHMDS (0.12 ml, 1 M in THF, 0.12 mmol). The reaction mixture was stirred at −78° C. for 10 min and cyclopropylsulfonyl chloride (22 mg, 0.15 mmol) was added to the mixture. The reaction was slowly warmed to room temperature and stirred at the temperature for 16 h. The reaction was quenched with saturated aqueous NH4Cl solution (10 ml) and extracted with EtOAc (2×10 ml). The combined organic solution was washed with brine (20 ml), dried over MgSO4 and concentrated. Silica gel chromatography (EtOAc:Hexanes=25:75) yields 24 mg (57%) of the title compound as a yellow solid.

Workup

temperatureThe reaction was slowly warmed to room temperature
stirringstirred at the temperature for 16 h
customThe reaction was quenched with saturated aqueous NH4Cl solution (10 ml)
extractionextracted with EtOAc (2×10 ml)
washThe combined organic solution was washed with brine (20 ml)
dry with materialdried over MgSO4
concentrationconcentrated

Sources & evidence

ORD record: ord-9419fa2b525f4683ab3f924319f401d7
Source dataset: uspto-grants-2010_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07820664B2

Reaction notes

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