4-(Trifluoromethyl)benzaldehyde → tert-butyl 4-(2-(4-(trifluoromethyl)benzyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole-8-carboxamido)piperidine-1-carboxylate

HRID 1042533Notes

Reaction equation

HRID 1042533 reaction equation
[CH2:1]1[C:13]2[C:12]3[CH:11]=[C:10]([C:14]([NH:16][CH:17]4[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:19][CH2:18]4)=[O:15])[CH:9]=[CH:8][C:7]=3[NH:6][C:5]=2[CH2:4][CH2:3][NH:2]1.[F:30][C:31]([F:41])([F:40])[C:32]1[CH:39]=[CH:38][C:35]([CH:36]=O)=[CH:34][CH:33]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(=O)(O)[O-].[Na+]>C(Cl)Cl.C(OCC)C>[F:30][C:31]([F:40])([F:41])[C:32]1[CH:39]=[CH:38][C:35]([CH2:36][N:2]2[CH2:3][CH2:4][C:5]3[NH:6][C:7]4[CH:8]=[CH:9][C:10]([C:14]([NH:16][CH:17]5[CH2:18][CH2:19][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:21][CH2:22]5)=[O:15])=[CH:11][C:12]=4[C:13]=3[CH2:1]2)=[CH:34][CH:33]=1

Participants

7

Reactant 4

HCID 679964-(Trifluoromethyl)benzaldehydeHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 66589660HCID 66589660, compound

Product 1

HCID 44177408tert-butyl 4-(2-(4-(trifluoromethyl)benzyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole-8-carboxamido)piperidine-1-carboxylateYield 84%

Reagents, catalysts & solvents 2

HCID 3283Diethyl EtherSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of tert-butyl 4-(2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole-8-carboxamido)piperidine-1-carboxylate (11.63 g, 29.2 mmol) and 4-(trifluoromethyl)benzaldehyde (4.8 mL, 6.12 g, 35.1 mmol) in DCM (200 mL), sodium triacetoxyborohydride (12.4 g, 8.5 mmol) was added. The reaction mixture was allowed to stir at room temperature overnight and then poured into saturated sodium bicarbonate solution (300 mL). The layers were separated, and the aqueous layer was extracted with DCM (3×100 mL). The combined organic layers were washed with brine (2×50 mL), dried (MgSO4), filtered and concentrated to give an off-white solid. Trituration with ethyl ether provided tert-butyl 4-(2-(4-(trifluoromethyl)benzyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole-8-carboxamido)piperidine-1-carboxylate (9 in Scheme 1(c)) as a white solid (13.60 g, 84%). 1H NMR (DMSO-d6, 300 MHZ) 11.03 (br s, 1H), 8.01 (d, J=7.7 Hz, 1H), 7.83 (s, 1H), 7.71 (d, J=8.3 Hz, 2H), 7.62 (d, J=7.7 Hz, 2H), 7.55 (d, J=8.8 Hz, 1H), 7.26 (d, J=8.5 Hz, 1H), 4.22-3.83 (m, 5H), 3.62 (s, 2H), 2.90-2.77 (br s, 6H), 1.82-1.70 (m, 2H), 1.55-1.30 (m, 11H) ppm; MS (ES) 557 (M+H)

Workup

  1. customThe layers were separated
  2. extractionthe aqueous layer was extracted with DCM (3×100 mL)
  3. washThe combined organic layers were washed with brine (2×50 mL)
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customto give an off-white solid

Sources & evidence

ORD record
ord-f666d8bdaebb48119873a187dd7d6f6f
Source dataset
uspto-grants-2013_10
Patent number
US08557822B2

Reaction notes

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