Benzyl Bromide → HCID 58503182, compound

HRID 38128Notes

Reaction equation

HRID 38128 reaction equation
[N:1]([CH2:4][C@H:5]([OH:17])[C@H:6]([O:9][CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH:7]=[CH2:8])=[N+:2]=[N-:3].[CH2:18](Br)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.[H-].[Na+]>C1COCC1.[I-].C([N+](CCCC)(CCCC)CCCC)CCC>[N:1]([CH2:4][C@H:5]([O:17][CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C@H:6]([O:9][CH2:10][C:11]1[CH:12]=[CH:13][CH:14]=[CH:15][CH:16]=1)[CH:7]=[CH2:8])=[N+:2]=[N-:3]

Participants

6

Reactant 3

HCID 7498Benzyl BromideHCID 24758Sodium hydrideHCID 58503197(2S,3R)-1-azido-3-benzyloxy-4-penten-2-ol

Product 1

HCID 58503182HCID 58503182, compoundYield 68.5%

Reagents, catalysts & solvents 2

HCID 67553Tetrabutylammonium IodideCatalystHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

To a stirring solution of (2S,3R)-1-azido-3-benzyloxy-4-penten-2-ol (1) (250 μL, 1.07 mmol) in THF (50 mL) under argon was added tetrabutylammonium iodide (42 mg, 0.11 mmol) followed by benzyl bromide (155 μL, 1.27 mmol) and the reaction was cooled to 0° C. Sodium hydride (60% in mineral oil, 47 mg, 1.18 mmol) was added in small portions and the reaction was stirred overnight with warming to rt. The reaction was quenched with MeOH, filtered through Celite, and washed with Et2O. The organic solvent was removed under vacuum to give an oily residue, which was purified by flash chromatography (silica gel, 2% Et2O/hex) to yield (3R,4S)-5-azido-3,4-bisbenzyloxy-pent-1-ene (2, 237 mg, 65% yield) as a clear non-volatile liquid: Rf=0.62 (1:4 EtOAc/hex); [α]D=−6.1° (c 1.50, CHCl3); 1H NMR (CDCl3, 300 MHz) 7.35-7.24 (m, 10H), 5.81 (ddd, J=17.15, 10.58, 7.45 Hz, 1H), 5.37 (ddd, J=5.70, 1.65, 0.86 Hz, 1H), 5.33 (ddd, J=12.07, 1.44, 0.81 Hz, 1H), 4.63 (s, 2H), 4.61 (d, J=11.87 Hz, 1H), 4.35 (d, J=11.78 Hz, 1H), 3.90 (tdd, J=7.37, 5.65, 0.79, 0.79 Hz, 1H), 3.60 (ddd, J=6.39, 5.69, 3.64 Hz, 1H), 3.43 (dd, J=12.93, 6.42 Hz, 1H), 3.35 (dd, J=12.93, 3.60 Hz, 1H); 13C NMR (CDCl3, 75 MHz) δ 138.25, 138.01, 135.43, 128.60 (4C), 128.29 (2C), 128.02, 127.99 (2C), 127.87, 119.97, 80.76, 80.23, 73.33, 70.79, 51.69; FTIR (NaCl): 2867, 2100, 1606, 1454, 1286, 1095, 1073.

Workup

  1. temperaturewith warming to rt
  2. customThe reaction was quenched with MeOH
  3. filtrationfiltered through Celite
  4. washwashed with Et2O
  5. customThe organic solvent was removed under vacuum
  6. customto give an oily residue, which
  7. customwas purified by flash chromatography (silica gel, 2% Et2O/hex)

Sources & evidence

ORD record
ord-a3d4d7830dad4601a11d1e5f6ec045c5
Source dataset
uspto-grants-2013_09
Patent number
US08524689B2

Reaction notes

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