Acetyl chloride → 1-[8(tert-butyl-dimethyl-silanyloxy)-6H-5-thia-11-aza-benzo[a]fluoren-11-yl]-ethanone

HRID 642770Notes

Reaction equation

HRID 642770 reaction equation
[C:1]([Si:5]([CH3:25])([CH3:24])[O:6][C:7]1[CH:8]=[C:9]2[C:17](=[CH:18][CH:19]=1)[NH:16][C:15]1[C:14]3[CH:20]=[CH:21][CH:22]=[CH:23][C:13]=3[S:12][CH2:11][C:10]2=1)([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].[C:28](Cl)(=[O:30])[CH3:29]>CN(C=O)C>[C:1]([Si:5]([CH3:25])([CH3:24])[O:6][C:7]1[CH:8]=[C:9]2[C:17](=[CH:18][CH:19]=1)[N:16]([C:28](=[O:30])[CH3:29])[C:15]1[C:14]3[CH:20]=[CH:21][CH:22]=[CH:23][C:13]=3[S:12][CH2:11][C:10]2=1)([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 6367Acetyl chlorideHCID 24758Sodium hydrideHCID 596760598-(Tert-butyl-dimethyl-silanyloxy)-6,11-dihydro-5-thia-11-aza-benzo[a]fluorene

Product 1

HCID 596760521-[8(tert-butyl-dimethyl-silanyloxy)-6H-5-thia-11-aza-benzo[a]fluoren-11-yl]-ethanone

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

8-(tert-Butyl-dimethyl-silanyloxy)-6,11-dihydro-5-thia-11-aza-benzo[a]fluorene (170 mg, 0.462 mmoL) in DMF (2 mL) was treated with NaH (60%, 37 mg, 0.925 mmoL) at 0° C. Acetyl chloride (52 mg, 0.693 mmoL) was added dropwise into the reaction 30 minutes later. The reaction mixture was than slowly warmed to room temperature over 2 hours. The reaction was quenched with saturated NH4Cl. The residue was partitioned between CH2Cl2 and saturated NaHCO3. The aqueous phase was extracted two times with CH2Cl2. The organic layer from each extraction was combined, washed with water, brine, dried over anhydrous Na2SO4, filtered and concentrated to yield a brown oil. The oil was then purified by column chromatography (silica gel, hexanes:EtOAc 5:1 as eluent) to yield the title compound as a pale solid.

Workup

  1. customThe reaction was quenched with saturated NH4Cl
  2. customThe residue was partitioned between CH2Cl2 and saturated NaHCO3
  3. extractionThe aqueous phase was extracted two times with CH2Cl2
  4. extractionThe organic layer from each extraction
  5. washwashed with water, brine
  6. dry with materialdried over anhydrous Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customto yield a brown oil
  10. customThe oil was then purified by column chromatography (silica gel, hexanes:EtOAc 5:1 as eluent)

Sources & evidence

ORD record
ord-4f41f6ccba214ba9b0d1b37c5163e2af
Source dataset
uspto-grants-2010_04
Patent number
US07696239B2

Reaction notes

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