8-Hydroxyquinoline → tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

HRID 1020663Notes

Reaction equation

HRID 1020663 reaction equation
[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][NH:12][C:11](=[O:15])[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[C:17]1[CH:25]=[C:24]2[C:20]([C:21]3[CH2:39][CH2:38][N:37]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:36][C:22]=3[N:23]2[S:26]([C:29]2[CH:35]=[CH:34][C:32]([CH3:33])=[CH:31][CH:30]=2)(=[O:28])=[O:27])=[CH:19][CH:18]=1.OC1C=CC=C2C=1N=CC=C2.C([O-])([O-])=O.[Cs+].[Cs+]>CS(C)=O.[Cu]I>[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][N:12]([C:17]2[CH:25]=[C:24]3[C:20]([C:21]4[CH2:39][CH2:38][N:37]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:36][C:22]=4[N:23]3[S:26]([C:29]3[CH:30]=[CH:31][C:32]([CH3:33])=[CH:34][CH:35]=3)(=[O:28])=[O:27])=[CH:19][CH:18]=2)[C:11](=[O:15])[CH:10]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

7

Reactant 4

HCID 19238-HydroxyquinolineHCID 10796Cesium carbonateHCID 36077244-Benzyloxy-2(1H)-pyridoneHCID 57950467tert-butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Product 1

HCID 57950318tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylateYield 54%

Reagents, catalysts & solvents 2

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 679Dimethyl SulfoxideSolvent

Conditions

Temperature
135 °C

Procedure

A suspension of 4-(benzyloxy)pyridin-2(1H)-one (426 mg, 2.12 mmol), tert-butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.28 g, 2.54 mmol), CuI (484 mg, 2.54 mmol), 8-hydroxyquinoline (369 mg, 2.54 mmol) and Cs2CO3 (760 mg, 2.33 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring for 1.5 h. The suspension was cooled, 4:1 CH2Cl2/(9:1 MeOH/NH4OH) (50 mL) was added and the resulting suspension was stirred at 25° C. for 10 min. The suspension was passed through a plug of silica gel and the filtrate was washed with brine. The solution was dried over Na2SO4 and concentrated under reduced pressure to afford an amorphous solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH2Cl2/MeOH/NH4OH) 100:0 to 0:100) yielded the title compound (715 mg, 54%) as an off-white solid: 1H NMR (300 MHz, CDCl3) δ 8.18 (br s, 1H), 7.82-7.73 (m, 2H), 7.48-7.35 (m, 6H), 7.33-7.23 (m, 4H), 6.12-5.97 (m, 2H) 5.07 (s, 2H), 4.90 (br s, 2H), 3.72-3.64 (m, 2H), 2.73-2.63 (m, 2H), 2.34 (s, 3H), 1.51 (s, 9H).

Workup

  1. customwas degassed under reduced pressure for 45 min
  2. temperatureThe suspension was cooled
  3. addition4:1 CH2Cl2/(9:1 MeOH/NH4OH) (50 mL) was added
  4. stirringthe resulting suspension was stirred at 25° C. for 10 min
  5. washthe filtrate was washed with brine
  6. dry with materialThe solution was dried over Na2SO4
  7. concentrationconcentrated under reduced pressure
  8. customto afford an amorphous solid

Sources & evidence

ORD record
ord-2a48655c6baa4f60bc0097e493bb80d3
Source dataset
uspto-grants-2014_05
Patent number
US08716308B2

Reaction notes

Loading…