3-Vinylpyridine → 9-methyl-6-(2-pyridin-3-yl-ethyl)-2,3,4,5,6,10c-hexahydro-1H-3a,6,7-triaza-cyclopenta[c]fluorene

HRID 1469457Notes

Reaction equation

HRID 1469457 reaction equation
[CH3:1][C:2]1[CH:14]=[N:13][C:12]2[NH:11][C:10]3[CH2:9][CH2:8][N:7]4[CH2:15][CH2:16][CH2:17][CH:6]4[C:5]=3[C:4]=2[CH:3]=1.[CH:18]([C:20]1[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=1)=[CH2:19].[OH-].[Na+]>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.O>[CH3:1][C:2]1[CH:14]=[N:13][C:12]2[N:11]([CH2:19][CH2:18][C:20]3[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=3)[C:10]3[CH2:9][CH2:8][N:7]4[CH2:15][CH2:16][CH2:17][CH:6]4[C:5]=3[C:4]=2[CH:3]=1

Participants

6

Reactant 3

HCID 142723-VinylpyridineHCID 14798Sodium HydroxideHCID 67434681HCID 67434681, compound

Product 1

HCID 710076009-methyl-6-(2-pyridin-3-yl-ethyl)-2,3,4,5,6,10c-hexahydro-1H-3a,6,7-triaza-cyclopenta[c]fluoreneYield 39.7%

Reagents, catalysts & solvents 2

HCID 74236Tetrabutylammonium BromideCatalystHCID 962WaterSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 9-methyl-2,3,4,5,6,10c-hexahydro-1H-3a,6,7-triaza-cyclopenta[c]fluorene (100 mg, 0.44 mmol), 3-vinyl-pyridine (185 mg, 1.762 mmol), tetrabutylammonium bromide (425 mg, 1.32 mmol) and 50% NaOH solution (6 mL) was stirred at 100° C. for 18 h. The progress of reaction was monitored by TLC and LCMS. The reaction mixture was diluted with water (20 mL) and extracted with EtOAc (2×50 mL). The combined organic layer was washed with brine solution (50 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to yield 9-methyl-6-(2-pyridin-3-yl-ethyl)-2,3,4,5,6,10c-hexahydro-1H-3a,6,7-triaza-cyclopenta[c]fluorene (58 mg). 1H NMR (CDCl3, freebase) δ (ppm): 8.41 (d, 1H), 8.27 (s, 1H), 8.07 (s, 1H), 7.58 (s, 1H), 7.2 (d, 1H), 7.1 (dd, 1H), 4.4 (m, 2H), 3.99 (bs, 1H), 3.2 (dd, 1H), 3.17 (t, 2H), 2.84-2.7 (m, 3H), 2.5 (m, 1H), 2.41 (s, 3H), 2.2 (dd, 1H), 1.9 (m, 4H). Separation by chiral HPLC provided enantiomers 134a and 134b.

Workup

  1. customThe progress of reaction
  2. extractionextracted with EtOAc (2×50 mL)
  3. washThe combined organic layer was washed with brine solution (50 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-6ffea86dfabb4c22a5cc07f602e2c78e
Source dataset
uspto-grants-2015_04
Patent number
US09006263B2

Reaction notes

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