Methanol → 1-(3-Tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-2-formylpyrrole

HRID 1699195Notes

Reaction equation

HRID 1699195 reaction equation
[Si:1]([O:18][CH2:19][C:20]1[C:21]([Cl:34])=[C:22]([N:27]2[CH:31]=[CH:30][CH:29]=[C:28]2[C:32]#N)[CH:23]=[CH:24][C:25]=1[Cl:26])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].C([Al+]CC(C)C)C(C)C.C[OH:46]>ClCCl.O>[Si:1]([O:18][CH2:19][C:20]1[C:21]([Cl:34])=[C:22]([N:27]2[CH:31]=[CH:30][CH:29]=[C:28]2[CH:32]=[O:46])[CH:23]=[CH:24][C:25]=1[Cl:26])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[C:8]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=1

Participants

6

Reactant 3

HCID 887MethanolHCID 183218191-(3-Tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-2-cyanopyrroleHCID 21225700Diisobutylaluminumhydride

Product 1

HCID 183218991-(3-Tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-2-formylpyrrole

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 6344DichloromethaneSolvent

Procedure

To a solution of 1-(3-tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-2-cyanopyrrole (2.44 g) in dichloromethane (25 ml) was added diisobutylaluminum hydride (1.5 M solution in toluene, 4.9 ml) under nitrogen atmosphere in water bath, and the mixture was stirred for 30 minutes at the same temperature. The reaction mixture was cooled in ice water bath, and to the mixture were added dropwise methanol (1 ml) and water (1 ml). The mixture was stirred for 1 hour, quenched with 1N sodium hydroxide solution and extracted with chloroform. The organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and brine, dried over magnesium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel eluting with a mixture of n-hexane and ethyl acetate (20:1, V/V) to give 1-(3-tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-2-formylpyrrole (1.9 g) as an oil.

Workup

  1. stirringThe mixture was stirred for 1 hour
  2. customquenched with 1N sodium hydroxide solution
  3. extractionextracted with chloroform
  4. washThe organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and brine
  5. dry with materialdried over magnesium sulfate
  6. customevaporated in vacuo
  7. customThe residue was chromatographed on silica gel eluting with a mixture of n-hexane and ethyl acetate (20:1, V/V)

Sources & evidence

ORD record
ord-ca11a6f2888e48a78b76e621bdcd58d7
Source dataset
uspto-grants-2002_02
Patent number
US06344462B1

Reaction notes

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