Hexane → HCID 58688327, compound

HRID 2197570Notes

Reaction equation

Br[C:2]1[S:6][C:5]([CH2:7][CH:8]([CH3:10])[CH3:9])=[N:4][CH:3]=1.C([Li])CCC.CCCCCC.C(O[B:26]1[O:30][C:29]([CH3:32])([CH3:31])[C:28]([CH3:34])([CH3:33])[O:27]1)(C)C>C1COCC1>[CH2:7]([C:5]1[S:6][C:2]([B:26]2[O:30][C:29]([CH3:32])([CH3:31])[C:28]([CH3:34])([CH3:33])[O:27]2)=[CH:3][N:4]=1)[CH:8]([CH3:10])[CH3:9]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 5-bromo-2-isobutylthiazole (2.10 g, 9.54 mmol) in THF (20 mL) was added 1.6 M n-butyllithium in hexane solution (7.15 mL, 11.44 mmol) dropwise over 45 minutes at −78° C. The resulting solution was stirred at −78° C. for 10 minutes. Then the 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2.13 g, 11.44 mmol) was added to the above solution and stirred at −78° C. for 1.5 hours. The reaction was quenched with 1:1 saturated ammonium chloride and water and warmed up to close to room temperature. The resulting mixture was extracted with ethyl acetate, washed with water, brine and concentrated. The residue was subjected to flash column chromatography using 30% ethyl acetate/hexane to give a yellow oil (454 mg, 18% yield). 1H NMR, 400 MHz, CDCl3: δ 8.13 (s, 1 H), 2.95 (d, J=7.1 Hz, 2 H), 2.10-2.19 (m, 1 H), 1.36 (s, 12 H), 1.00 (d, J=6.6 Hz, 6 H).

Workup

stirringstirred at −78° C. for 1.5 hours
customThe reaction was quenched with 1:1 saturated ammonium chloride and water
temperaturewarmed up
customto close to room temperature
extractionThe resulting mixture was extracted with ethyl acetate
washwashed with water, brine
concentrationconcentrated

Sources & evidence

ORD record: ord-6d724b070d6f44eca0e5b4bca68c5b79
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08338604B2

Reaction notes

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