Cesium carbonate → HCID 59129578, compound

HRID 2038137Notes

Reaction equation

HRID 2038137 reaction equation
[Si](O[CH2:9][CH2:10][C:11]([C:14]1[NH:15][C:16]2[C:21]([CH:22]=1)=[CH:20][C:19]([N+:23]([O-:25])=[O:24])=[C:18]([F:26])[CH:17]=2)([CH3:13])[CH3:12])(C(C)(C)C)(C)C.CC1C=CC(S(OC[C@@H]2COC(C)(C)O2)(=O)=O)=CC=1.C([O-])([O-])=O.[Cs+].[Cs+]>>[F:26][C:18]1[C:19]([N+:23]([O-:25])=[O:24])=[CH:20][C:21]2[CH:22]=[C:14]3[C:11]([CH3:13])([CH3:12])[CH2:10][CH2:9][N:15]3[C:16]=2[CH:17]=1

Participants

4

Reactant 3

HCID 10796Cesium carbonateHCID 2723760(S)-(+)-2,2-Dimethyl-1,3-dioxolan-4-ylmethyl p-ToluenesulfonateHCID 59129412HCID 59129412, compound

Product 1

HCID 59129578HCID 59129578, compoundYield 48.3%

Conditions

Temperature
90 °C

Procedure

To a solution of 2-(4-(tert-butyldimethylsilyloxy)-2-methylbutan-2-yl)-6-fluoro-5-nitro-1H-indole (1.9 g, 5.0 mmol) and (S)-(2,2-dimethyl-1,3-dioxolan-4-yl)methyl 4-methylbenzenesulfonate (2.86 g, 10.0 mmol) DMF (10 mL) was added Cs2CO3 (4.88 g, 15.0 mmol). The mixture was heated at 90° C. for 24 hours. The reaction was partitioned between ethyl acetate and water. The aqueous layer was extracted with ethyl acetate and the combined organic layers were washed with brine and dried over MgSO4. After the removal of solvent, the residue was purified by column chromatography (10-50% ethyl acetate-hexane) to afford 6-fluoro-1,1-dimethyl-7-nitro-2,3-dihydro-1H-pyrrolo[1,2-a]indole (600 mg, 48%). ESI-MS m/z calc. 248.1, found 249.2 (M+1)+. Retention time 2.00 minutes; 2-(4-(((R)-2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)-2-methylbutan-2-yl)-1-(((R)-2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-6-fluoro-5-nitro-1H-indole (270 mg, containing some (R)-2-(4-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)-2-methylbutan-2-yl)-6-fluoro-5-nitro-1H-indole). ESI-MS m/z calc. 494.2 and 380.2, found 495.4 and 381.4 (M+1)+. Retention time 2.12 and 1.92 minutes; (R)-3-(1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-6-fluoro-5-nitro-1H-indol-2-yl)-3-methylbutan-1-01 (1.0 g, containing some 3-(6-fluoro-5-nitro-1H-indol-2-yl)-3-methylbutan-1-ol). ESI-MS m/z calc. 380.2 and 266.1, found 381.2 and 267.2 (M+1)+. Retention time 1.74 and 1.48 minutes.

Workup

  1. customThe reaction was partitioned between ethyl acetate and water
  2. extractionThe aqueous layer was extracted with ethyl acetate
  3. washthe combined organic layers were washed with brine
  4. dry with materialdried over MgSO4
  5. customAfter the removal of solvent
  6. customthe residue was purified by column chromatography (10-50% ethyl acetate-hexane)

Sources & evidence

ORD record
ord-96cd7bcba32949c79184654d5bcf1074
Source dataset
uspto-grants-2013_11
Patent number
US08575209B2

Reaction notes

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