4-Chlorophenol → tert-Butyl 6-[2-(4-chlorophenoxy)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

HRID 2306954Notes

Reaction equation

HRID 2306954 reaction equation
[OH:1][CH2:2][CH2:3][N:4]1[C:12]2[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=2[C:6]2[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:16][CH2:17][C:5]1=2.[Cl:25][C:26]1[CH:31]=[CH:30][C:29](O)=[CH:28][CH:27]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1>[Cl:25][C:26]1[CH:31]=[CH:30][C:29]([O:1][CH2:2][CH2:3][N:4]2[C:12]3[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=3[C:6]3[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:16][CH2:17][C:5]2=3)=[CH:28][CH:27]=1

Participants

6

Reactant 4

HCID 46844-ChlorophenolHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 22396751tert-butyl 6-(2-hydroxyethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

Product 1

HCID 22396776tert-Butyl 6-[2-(4-chlorophenoxy)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylateYield 88%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

tert-Butyl 6-(2-hydroxyethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.533 g, 1.61 mmol), p-chlorophenol (0.224 g, 1.74 mmol, 1.08 equiv.) and triphenylphosphine (0.445 g, 1.70 mmol, 1.05 equiv.) was dissolved in THF (10 mL) and stirred at rt under N2. Diethyl azodicarboxylate (0.30 mL, 0.337 g, 1.93 mmol, 1.2 equiv.) was added, and the reaction mixture was stirred for 2.5 h. The reaction mixture was concentrated to give crude product (1.85 g), which was chromatographed (SiO2 175 g, eluted with 4:1 hexane:EtOAc) to give tert-butyl 6-[2-(4-chlorophenoxy)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.622 g) in 88% yield. 1H NMR (300 MHz, CD3OD) δ 1.48, 2.96-3.03, 3.05-3.14, 3.63-3.78, 4.15, 4.48, 6.70, 7.11, 7.15-7.20, 7.17, 7.27-7.31, 7.46-7.51; MS (ESI+) for C25H29ClN2O3 m/z 440.9 (M+H)+.

Workup

  1. stirringthe reaction mixture was stirred for 2.5 h
  2. concentrationThe reaction mixture was concentrated
  3. customto give crude product (1.85 g), which
  4. customwas chromatographed
  5. wash(SiO2 175 g, eluted with 4:1 hexane:EtOAc)

Sources & evidence

ORD record
ord-7aac2f0c12eb443383abcc2fe49672a6
Source dataset
uspto-grants-2004_12
Patent number
US06828314B2

Reaction notes

Loading…