Triphenylphosphine → 3-[2-(t-Butoxycarbonylamino)ethoxy]isoxazole

HRID 1064344Notes

Reaction equation

HRID 1064344 reaction equation
N(C(OC(C)C)=O)=NC(OC(C)C)=O.[C:15]([O:19][C:20]([NH:22][CH2:23][CH2:24][OH:25])=[O:21])([CH3:18])([CH3:17])[CH3:16].O[C:27]1[CH:31]=[CH:30][O:29][N:28]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C1COCC1>[C:15]([O:19][C:20]([NH:22][CH2:23][CH2:24][O:25][C:27]1[CH:31]=[CH:30][O:29][N:28]=1)=[O:21])([CH3:18])([CH3:17])[CH3:16]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 2733206tert-butyl N-(2-hydroxyethyl)carbamateHCID 178516613HCID 178516613, compound

Product 1

HCID 222735143-[2-(t-Butoxycarbonylamino)ethoxy]isoxazoleYield 44.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Diisopropyl azodicarboxylate (1.1 ml, 5.5 mmol) was added dropwise to a solution of 2-(t-butoxycarbonylamino)ethanol (850 μl, 5.5 mmol), 3-hydroxyisoxazole (Method 75; 425 mg, 5 mmol) and triphenylphosphine (1.44 g, 5.5 mmol) in THF (20 ml) and the mixture was stirred at ambient temperature for 18 hours. The solvent was evaporated and the residue purified by flash chromatography on silica gel eluting with iso-hexane:EtOAc (100:0 increasing in polarity to 4:1) to give the title compound (506 mg, 44%) as a white solid. NMR 1.43 (s, 9H), 3.56 (m, 2H), 4.32 (m, 2H), 4.90 (s, 1H), 5.98 (s, 1H), 8.16 (s, 1H); m/z 229.

Workup

  1. customThe solvent was evaporated
  2. customthe residue purified by flash chromatography on silica gel eluting with iso-hexane:EtOAc (100:0 increasing in polarity to 4:1)

Sources & evidence

ORD record
ord-c634e0685a3a4003aadbc5d94019f189
Source dataset
uspto-grants-2005_11
Patent number
US06969714B2

Reaction notes

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