2,2,2-Trifluoroethanol → 1-t-butoxycarbonyl-4-(1-(2-(2,2,2-trifluoroethoxy)ethyl)-1H-benzimidazol-2-yl)[1,4]diazepane

HRID 1584474Notes

Reaction equation

HRID 1584474 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][CH2:12][N:11]([C:15]2[N:19]([CH2:20][CH2:21][OH:22])[C:18]3[CH:23]=[CH:24][CH:25]=[CH:26][C:17]=3[N:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O.C(P(CCCC)CCCC)CCC.[F:58][C:59]([F:63])([F:62])[CH2:60]O>C1(C)C=CC=CC=1.C(OCC)(=O)C.CCCCCC.CCCCCC>[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][CH2:12][N:11]([C:15]2[N:19]([CH2:20][CH2:21][O:22][CH2:60][C:59]([F:63])([F:62])[F:58])[C:18]3[CH:23]=[CH:24][CH:25]=[CH:26][C:17]=3[N:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

8

Reactant 4

HCID 64092,2,2-TrifluoroethanolHCID 13831TributylphosphineHCID 730421,1'-(Azodicarbonyl)dipiperidineHCID 184648041-t-butoxycarbonyl-4-(1-(2-hydroxyethyl)-1H-benzimidazol-2-yl)[1,4]diazepane

Product 1

HCID 212234871-t-butoxycarbonyl-4-(1-(2-(2,2,2-trifluoroethoxy)ethyl)-1H-benzimidazol-2-yl)[1,4]diazepane

Reagents, catalysts & solvents 3

HCID 1140TolueneSolventHCID 8058HexaneSolventHCID 21226206Ethyl acetate hexaneSolvent

Conditions

Temperature
55 °C

Procedure

According to the procedure of Tet. Let. 35, 5997-6000 (1994), combine 4-(1-(2-hydroxyethyl)-1H-benzimidazol-2-yl)[1,4]diazepane (10 mmol) and di-t-butyl dicarbonate (10 mmol) in tetrahydrofuran (100 mmol). After 18 hours, evaporate in vacuo to give 1-t-butoxycarbonyl-4-(1-(2-hydroxyethyl)-1H-benzimidazol-2-yl)[1,4]diazepane. Combine 1-t-butoxycarbonyl-4-(1-(2-hydroxyethyl)-1H-benzimidazol-2-yl)[1,4]diazepane (0.66 g, 1.84 mmol) and 1,1'-(azodicarbonyl)dipiperidine (0.50 g, 2 mmol) in toluene (20 mL). Add tributylphosphine (0.5 mL, 2 mmol). After 10 minutes, add 2,2,2-trifluoroethanol (0.7 mL, 10 mmol). Heat to 55° C. After 6 hours, cool to ambient temperature. After 18 hours, concentrate the reaction mixture to give a residue. Chromatograph the residue on silica gel eluting sequentially with hexane and then 30% ethyl acetate/hexane to give 1-t- butoxycarbonyl-4-(1-(2-(2,2,2-trifluoroethoxy)ethyl)-1H-benzimidazol-2-yl)[1,4]diazepane.

Workup

  1. waitAfter 6 hours
  2. temperaturecool to ambient temperature
  3. waitAfter 18 hours
  4. concentrationconcentrate the reaction mixture
  5. customto give a residue

Sources & evidence

ORD record
ord-e7d84809d1ba410cb6aee8acb49061b8
Source dataset
uspto-grants-1999_08
Patent number
US05932571

Reaction notes

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