Benzyl Alcohol → Tert-butyl (2-(benzyloxy)-5-nitrophenyl)carbamate

HRID 1482686Notes

Reaction equation

HRID 1482686 reaction equation
N#N.[OH:3][C:4]1[CH:9]=[CH:8][C:7]([N+:10]([O-:12])=[O:11])=[CH:6][C:5]=1[NH:13][C:14](=[O:20])[O:15][C:16]([CH3:19])([CH3:18])[CH3:17].[CH2:21](O)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C(Cl)Cl.O.CCCCCC.C(OCC)(=O)C>[CH2:21]([O:3][C:4]1[CH:9]=[CH:8][C:7]([N+:10]([O-:12])=[O:11])=[CH:6][C:5]=1[NH:13][C:14](=[O:20])[O:15][C:16]([CH3:17])([CH3:19])[CH3:18])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1

Participants

9

Reactant 5

HCID 244Benzyl AlcoholHCID 947NitrogenHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 15252120Tert-butyl 2-hydroxy-5-nitrophenylcarbamate

Product 1

HCID 86724342Tert-butyl (2-(benzyloxy)-5-nitrophenyl)carbamate

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6344DichloromethaneSolvent2×HCID 21226206Ethyl acetate hexaneSolvent

Conditions

Temperature
0 °C

Procedure

In a 50 mL 3-neck RBF equipped with N2-bubbler and thermo pocket, tert-butyl (2-hydroxy-5-nitrophenyl)carbamate (2.0 g), benzyl alcohol (1.02 g) and triphenyl phosphine (2.48 g) were taken in 10 mL DCM. The reaction mixture was cooled to 0° C. Diethyl azodicarboxylate (1.65 g) was dissolved in 10 mL DCM was added dropwise in the reaction. The reaction mixture was stirred at room temperature for 24 h. The reaction mixture was monitored on TLC using hexane:ethyl acetate (6:4) as mobile phase. After completion, the reaction was poured into water and extracted with DCM (3×50 mL). The DCM layer was washed with brine solution, dried over sodium sulfate and concentrated under reduced pressure at 40° C. Purification was carried out by column chromatography. Desired product eluted with 5% ethyl acetate in hexane to give, after concentration, 1.03 g of tert-butyl (2-(benzyloxy)-5-nitrophenyl)carbamate. 1H NMR: DMSO-d6 (400 MHz) 1.48 (s, 9H), 5.34 (s, 2H), 7.26 (d, 1H, J=9.2), 7.35 (m, 1H), 7.41 (m, 2H), 7.54 (d, 2H, J=6.8), 7.95 (dd, 1H, J=2.8, 9.2), 8.51 (s, 1H), 8.64 (d, 1H, J=2.8).

Workup

  1. additionwas added dropwise in the reaction
  2. extractionextracted with DCM (3×50 mL)
  3. washThe DCM layer was washed with brine solution
  4. dry with materialdried over sodium sulfate
  5. concentrationconcentrated under reduced pressure at 40° C
  6. customPurification
  7. washDesired product eluted with 5% ethyl acetate in hexane
  8. customto give
  9. concentrationafter concentration, 1.03 g of tert-butyl (2-(benzyloxy)-5-nitrophenyl)carbamate

Sources & evidence

ORD record
ord-e4f5a88983d94461b71b7dfd72c6fbc2
Source dataset
uspto-grants-2016_08
Patent number
US09415049B2

Reaction notes

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