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[ CAS No. 377091-17-3 ] {[proInfo.proName]}

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Chemical Structure| 377091-17-3
Chemical Structure| 377091-17-3
Structure of 377091-17-3 * Storage: {[proInfo.prStorage]}
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Product Details of [ 377091-17-3 ]

CAS No. :377091-17-3 MDL No. :MFCD28047540
Formula : C8H8Br2O2 Boiling Point : -
Linear Structure Formula :C6H3Br2C2H5O2 InChI Key :-
M.W : 295.96 Pubchem ID :-
Synonyms :

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Application In Synthesis of [ 377091-17-3 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

  • Upstream synthesis route of [ 377091-17-3 ]
  • Downstream synthetic route of [ 377091-17-3 ]

[ 377091-17-3 ] Synthesis Path-Upstream   1~2

  • 1
  • [ 377091-17-3 ]
  • [ 66826-78-6 ]
Reference: [1] Organic Letters, 2001, vol. 3, # 21, p. 3357 - 3360
  • 2
  • [ 377091-17-3 ]
  • [ 189035-22-1 ]
YieldReaction ConditionsOperation in experiment
40%
Stage #1: With phosphorus tribromide In toluene at 90℃; for 2.5 h; Heating / reflux
Stage #2: With sodium hydroxide In water; toluene at 20℃;
Stage #3: With n-butyllithium In tetrahydrofuran; hexane at -75℃; for 0.5 h;
2-(2,5-dibromophenoxy)ethanol (4.65 g, 15.7 mmol) was dissolved in toluene (33 mL) with stirring under N2. PBr3 (0.67 mL, 7.07 mmol) was added and the resulting mixture heated at 90 0C under reflux condenser under N2 for 2.5 hours. The mixture was cooled to room temperature with a H2O bath and IN NaOH (28 mL) was added. The mixture was diluted with Et2O, shaken, and the layers separated. The organics were washed with H2O, dried over MgSO4, filtered, and concentrated on a rotary evaporator. The resulting oil was dissolved in THF (15 mL) with stirring under N2. The solution was cooled to -75 0C and n-BuLi (9.82 mL of a 1.6 M solution in hexane, 15.7 mmol) was added dropwise. The resulting clear, colorless solution was stirred 30 minutes at -75 0C, and then HOAc (1 mL) was added. The resulting mixture was warmed to room temperature and partitioned between H2O and Et2O. The organics were washed once with 0.5 M NaOH, once with H2O, and concentrated on a rotary evaporator. Flash chromatography <n="145"/>(5-10percent EtOAc/hexane) gave 1.38 g (90percent purity) (40percent yield) of 6-bromo-2,3- dihydrobenzofuran as a white solid. Rf= 0.56 (30percent EtOAc/hexane). 1H NMR (300 MHz, DMSO-D6) δ ppm 3.13 (t, J=8.52 Hz, 2 H) 4.56 (t, J=8.79 Hz, 2 H) 6.95 - 7.01 (m, 2 H) 7.14 - 7.20 (m, 1 H).
Reference: [1] Patent: WO2007/84560, 2007, A2, . Location in patent: Page/Page column 143-144
[2] Patent: EP2862571, 2015, A1,
[3] Patent: US2015/166559, 2015, A1,
[4] Patent: TW2016/2105, 2016, A,
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