Benzyl chloroformate → HCID 23560151, compound

HRID 397478Notes

Reaction equation

HRID 397478 reaction equation
[NH2:1][CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[CH2:9][C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11].Cl[C:18]([O:20][CH2:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)=[O:19]>C(Cl)Cl.CN(C)C1C=CN=CC=1>[CH2:21]([O:20][C:18]([NH:1][CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[CH2:9][C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])=[O:19])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1

Participants

5

Reactant 2

HCID 10387Benzyl chloroformate2×HCID 23560150HCID 23560150, compound

Product 1

HCID 23560151HCID 23560151, compound

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

To a solution of 3.0 g (9.64mmol) tert-butyl [2-(aminomethyl)phenyl]acetate in 100 mL methylene chloride cooled to 0° C. was added 0.825 ml (5.78 mmol) benzyl chloroformate followed by 1.47 g (12.05 mmol) of 4-dimethylaminopyridine and a second 0.825 ml (5.78 mmol) portion of benzyl chloroformate. After 30 min the reaction was washed with 10% potassium hydrogen sulfate (aq) (2×30 mL), water (1×30 mL), and brine (1×30 mL), dried over sodium sulfate, filtered and concentrated to dryness in vacuo. The resulting crude oil (3.69 g) was flash chromatographed on silica gel (15% ethyl acetate in hexane) to give tert-butyl [2-({[(benzyloxy)carbonyl]amino}methyl)phenyl]acetate as a colorless oil: 1H NMR (CDCl3, 400 MHz): δ7.38-7.30 (m, 5H), 7.28-7.21 (m, 4H), 5.40 (br s, 1H), 5.12 (s, 2H), 4.40 (d, 2H, J=5.5 Hz), 3.61 (s, 2H), 1.41 (s, 9H); MS (Electrospray): M+Na=378.1; TLC Rf=0.30 (15% ethyl acetate in hexane).

Workup

  1. washAfter 30 min the reaction was washed with 10% potassium hydrogen sulfate (aq) (2×30 mL), water (1×30 mL), and brine (1×30 mL)
  2. dry with materialdried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated to dryness in vacuo
  5. customchromatographed on silica gel (15% ethyl acetate in hexane)

Sources & evidence

ORD record
ord-8ab2bb6834684973a50432b58732d07a
Source dataset
uspto-grants-2003_08
Patent number
US06610701B2

Reaction notes

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