Hexane → HCID 58688327, compound

HRID 1958497Notes

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-628d600c793b4deeaf2c332103dbc41e
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08410128B2

Reaction notes

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