Trimethyltin chloride → 1-(2-(tert-butyldimethylsilyloxy)-2-methylpropyl)-2-methyl-4-(trimethylstannyl)-1H-imidazole

HRID 2044486Notes

Reaction equation

[Si:1]([O:8][C:9]([CH3:19])([CH3:18])[CH2:10][N:11]1[CH:15]=[C:14](I)[N:13]=[C:12]1[CH3:17])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([Mg]Br)C.[CH3:24][Sn:25](Cl)([CH3:27])[CH3:26]>C(Cl)Cl>[Si:1]([O:8][C:9]([CH3:19])([CH3:18])[CH2:10][N:11]1[CH:15]=[C:14]([Sn:25]([CH3:27])([CH3:26])[CH3:24])[N:13]=[C:12]1[CH3:17])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 10 °C

Procedure

To a mixture of 1-(2-(tert-butyldimethylsilyloxy)-2-methylpropyl)-4-iodo-2-methyl-1H-imidazole (1.5 g, 3.8 mmol) in DCM (15 mL) was added ethylmagnesium bromide (1.9 mL, 3 mol/L, 5.7 mmol) at −78° C. The temperature of the mixture was allowed to warm up to about 10° C. slowly and cooled again. Trimethyltin chloride (6.5 ml, 1 mol/L, 6.5 mmol) was added dropwise at −78° C. After the addition, the temperature was allowed to slowly warm up to room temperature. The reaction mixture was pouted into saturate NH4Cl solution, then extracted with DCM, The organic was washed with water twice, dried over anhydrous Na2SO4, concentrated to give 0.44 g of 1-(2-(tert-butyldimethylsilyloxy)-2-methylpropyl)-2-methyl-4-(trimethylstannyl)-1H-imidazole. Yield=63%. 1H NMR (CDCl3, 400 MHz): δ 7.04 (s, 1H, ArH), 3.74 (s, 2H), 2.43 (s, 3H), 1.24-1.20 (m, 6H), 0.88 (s, 9H), 0.29 (s, 6H), 0.03 (s, 8H). LC-MS: m/z=375 [M+H+]

Workup

temperaturecooled again
additionAfter the addition
temperatureto slowly warm up to room temperature
concentrationinto saturate NH4Cl solution
extractionextracted with DCM
washThe organic was washed with water twice
dry with materialdried over anhydrous Na2SO4
concentrationconcentrated

Sources & evidence

ORD record: ord-a3f4187587974c30bda0c64a04af9740
Source dataset: uspto-grants-2013_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08586574B2

Reaction notes

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