Methanol → HCID 10137991, compound

HRID 2257935Notes

Reaction equation

HRID 2257935 reaction equation
Cl.[C:2]1([C:8]2[CH:17]=[CH:16][C:15]3[C:10](=[CH:11][CH:12]=[C:13]([O:18]C)[CH:14]=3)[C:9]=2[CH2:20][C:21]2[CH:26]=[CH:25][C:24]([O:27][CH2:28][CH2:29][N:30]3[CH2:35][CH2:34][CH2:33][CH2:32][CH2:31]3)=[CH:23][CH:22]=2)[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.B(Cl)(Cl)Cl.CO>ClCCCl>[C:2]1([C:8]2[CH:17]=[CH:16][C:15]3[C:10](=[CH:11][CH:12]=[C:13]([OH:18])[CH:14]=3)[C:9]=2[CH2:20][C:21]2[CH:26]=[CH:25][C:24]([O:27][CH2:28][CH2:29][N:30]3[CH2:31][CH2:32][CH2:33][CH2:34][CH2:35]3)=[CH:23][CH:22]=2)[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 887MethanolHCID 25135Boron TrichlorideHCID 68819191HCID 68819191, compound

Product 1

HCID 10137991HCID 10137991, compoundYield 77.1%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

To a solution of the product of Example 9 (4.0 g, 8.0 mmol) stirring in 1,2-dichloroethane (50 mL) at 0° C. was added boron trichloride (10 mL, 117.0 mmol). The resulting dark purple solution was stirred at room temperature overnight in a sealed tube then cooled to 0° C. Methanol (50 mL) was carefully added dropwise over a 30 minute period (caution: gas evolution). The resulting solution was concentrated and dissolved in ethyl acetate. The organic extract was washed with saturated aqueous sodium bicarbonate, brine, dried (sodium sulfate), filtered, and concentrated. The resulting brown foam was purified by flash chromatography (silica gel, methanol/chloroform gradient) to give 2.7 g (63%) of desired product as a white foam: 1H-NMR (300 MHz, DMSO) δ 9.72 (br s, 1H), 7.62-7.80 (m, 2H), 7.22-7.50 (m, 6H), 7.10-7.22 (m, 2H), 7.00 (m, 1H), 6.80-6.90 (m, 2H), 6.78 (m, 1H), 4.23 (s, 2H), 3.85-4.10 (m, 2H), 2.50-2.75 (m, 2H), 2.25-2.50 (m, 4H), 1.25-1.56 (m, 6H); Anal. Calc'd. for: C, 82.35; H, 7.14; N, 3.20. Found: C, 82.17; H, 7.11; N, 3.35; MS (FD) m/e 437 (M+); IR (KBr) 2935.07, 2855.01, 1621.38, 1597.26 cm-1.

Workup

  1. temperaturethen cooled to 0° C
  2. concentrationThe resulting solution was concentrated
  3. dissolutiondissolved in ethyl acetate
  4. extractionThe organic extract
  5. washwas washed with saturated aqueous sodium bicarbonate, brine
  6. dry with materialdried (sodium sulfate)
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe resulting brown foam was purified by flash chromatography (silica gel, methanol/chloroform gradient)

Sources & evidence

ORD record
ord-8c67f070339a4488ac4e977348f251c8
Source dataset
uspto-grants-1997_08
Patent number
US05658931

Reaction notes

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