Tributyltin Chloride → (4-Morpholin-4-yl-phenyl)-(5-tributylstannanyl-imidazo[1,2-a]pyrazin-8-yl)-carbamic acid tert-butyl ester

HRID 1366214Notes

Reaction equation

HRID 1366214 reaction equation
[C:1]([O:5][C:6](=[O:30])[N:7]([C:20]1[C:21]2[N:22]([CH:27]=[CH:28][N:29]=2)[C:23](Br)=[CH:24][N:25]=1)[C:8]1[CH:13]=[CH:12][C:11]([N:14]2[CH2:19][CH2:18][O:17][CH2:16][CH2:15]2)=[CH:10][CH:9]=1)([CH3:4])([CH3:3])[CH3:2].C([Mg]Cl)(C)C.[CH2:36]([Sn:40](Cl)([CH2:45][CH2:46][CH2:47][CH3:48])[CH2:41][CH2:42][CH2:43][CH3:44])[CH2:37][CH2:38][CH3:39]>O1CCCC1>[C:1]([O:5][C:6](=[O:30])[N:7]([C:8]1[CH:13]=[CH:12][C:11]([N:14]2[CH2:19][CH2:18][O:17][CH2:16][CH2:15]2)=[CH:10][CH:9]=1)[C:20]1[C:21]2[N:22]([CH:27]=[CH:28][N:29]=2)[C:23]([Sn:40]([CH2:41][CH2:42][CH2:43][CH3:44])([CH2:45][CH2:46][CH2:47][CH3:48])[CH2:36][CH2:37][CH2:38][CH3:39])=[CH:24][N:25]=1)([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 15096Tributyltin ChlorideHCID 86616748(5-Bromoimidazo[1,2-a]pyrazin-8-yl)-(4-morpholin-4-ylphenyl)carbamic acid tert-butyl esterHCID 178418918HCID 178418918, compound

Product 1

HCID 59023110(4-Morpholin-4-yl-phenyl)-(5-tributylstannanyl-imidazo[1,2-a]pyrazin-8-yl)-carbamic acid tert-butyl esterYield 64%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-78 °C

Procedure

To a cooled (−78° C.) solution of (5-bromo-imidazo[1,2-a]pyrazin-8-yl)-(4-morpholin-4-yl-phenyl)-carbamic acid tert-butyl ester (2.55 g, 5.38 mmol) in tetrahydrofuran (20 mL) is added isopropylmagnesium chloride (0.829 g, 8.06 mmol). After stirring for 5 min tributyltin chloride (2.97 g, 9.14 mmol) is added and the reaction is stirred at −78 ° C. for 10 min before being allowed to warm to room temperature. After stirring at room temperature for 30 min, the mixture is concentrated. The residue is purified by silica gel flash column chromatography eluting with 5:1 petroleum ether-ethyl acetate followed by 1:1 petroleum ether-ethyl acetate to afford the product as yellow solid (2.35 g, 64%).

Workup

  1. additionis added
  2. temperatureto warm to room temperature
  3. stirringAfter stirring at room temperature for 30 min
  4. concentrationthe mixture is concentrated
  5. customThe residue is purified by silica gel flash column chromatography
  6. washeluting with 5:1 petroleum ether-ethyl acetate

Sources & evidence

ORD record
ord-3dcec750cd6f444bb294f6343395dc63
Source dataset
uspto-grants-2011_02
Patent number
US07893058B2

Reaction notes

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