Tetrahydrofuran → 3-(6-Cyano-1H-indol-3-yl)-4-(1-methyl-1H-indol-7-yl)-pyrrole-2,5-dione

HRID 2215773Notes

Reaction equation

HRID 2215773 reaction equation
[CH3:1][N:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[CH2:11][C:12]([NH2:14])=[O:13])[CH:4]=[CH:3]1.C[O:16][C:17](=O)[C:18]([C:20]1[C:28]2[C:23](=[CH:24][C:25]([C:29]#[N:30])=[CH:26][CH:27]=2)[NH:22][CH:21]=1)=O.CC(C)([O-])C.[K+].C1COCC1>CN(C=O)C>[C:29]([C:25]1[CH:24]=[C:23]2[C:28]([C:20]([C:18]3[C:17](=[O:16])[NH:14][C:12](=[O:13])[C:11]=3[C:9]3[CH:8]=[CH:7][CH:6]=[C:5]4[C:10]=3[N:2]([CH3:1])[CH:3]=[CH:4]4)=[CH:21][NH:22]2)=[CH:27][CH:26]=1)#[N:30]

Participants

6

Reactant 4

HCID 8028TetrahydrofuranHCID 114353972-(1-methyl-1H-indol-7-yl)acetamideHCID 23665647Potassium tert-butoxideHCID 69642384(6-cyano-1H-indol-3-yl)-oxo-acetic acid methyl ester

Product 1

HCID 219500243-(6-Cyano-1H-indol-3-yl)-4-(1-methyl-1H-indol-7-yl)-pyrrole-2,5-dione

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

To a solution of 2-(1-methyl-1H-indol-7-yl)-acetamide (0.410 g, 2.18 mmol) and (6-cyano-1H-indol-3-yl)-oxo-acetic acid methyl ester (0.480 g, 2.10 mmol) in DMF (30 mL) under N2 was added a 1.0 M solution of potassium-tert-butoxide in THF (7.6 mL, 7.6 mmol) dropwise over 5 minutes. The mixture was heated at 70° C. for 17 h. The mixture was cooled to room temperature, quenched with 1N HCl (excess) and poured into EtOAc. The organic layer was separated, washed with water (3×), saturated aq NaHCO3, and brine, dried (MgSO4), filtered and concentrated onto flash SiO2. Flash chromatography (60–70% EtOAc/hex) gave the title compound as a bright orange-red solid which was dried under vacuum at 75° C. overnight (0.416 g, 54%). 1H NMR (400 MHz, DMSO-d6) 12.29 (br s, 1H), 11.26 (s, 1H), 8.03 (d, J=2.3 Hz, 1H), 7.86 (br s, 1H), 7.63 (d, J=8 Hz, 1H), 7.25 (d, J=3 Hz, 1H), 6.99 (dd, J=8, 8 Hz, 1H), 6.91 (d, J=8 Hz, 1H), 6.89 (d, J=8 Hz, 1H), 6.60 (d, J=8 Hz, 1H), 6.49 (d, J=3 Hz, 1H), 3.66 (s, 3H). IR (KBR, cm−1) 3282, 2223, 1751, 1698. MS (electrospray, m/z) 367.1 (M++1), 365.2 (M−−1). HRMS 367.1190 (M++1, calcd for C22H15N4O2 367.1195).

Workup

  1. temperatureThe mixture was cooled to room temperature
  2. customquenched with 1N HCl (excess)
  3. additionpoured into EtOAc
  4. customThe organic layer was separated
  5. washwashed with water (3×), saturated aq NaHCO3, and brine
  6. dry with materialdried (MgSO4)
  7. filtrationfiltered
  8. concentrationconcentrated onto flash SiO2

Sources & evidence

ORD record
ord-3eede39ea4314d2997e960f1a1b66f39
Source dataset
uspto-grants-2006_09
Patent number
US07109229B2

Reaction notes

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