2-Naphthol → (2S,4S)-1-tert-Butyl 2-methyl 4-(naphthalen-2-yloxy)pyrrolidine-1,2-dicarboxylate

HRID 354407Notes

Reaction equation

HRID 354407 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][C@H:11]([OH:13])[CH2:10][C@H:9]1[C:14]([O:16][CH3:17])=[O:15])=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH:18]1[C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH:21]=[CH:20][C:19]=1O.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:12][C@@H:11]([O:13][C:20]2[CH:19]=[CH:18][C:27]3[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=3)[CH:21]=2)[CH2:10][C@H:9]1[C:14]([O:16][CH3:17])=[O:15])=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

6

Reactant 4

HCID 86632-NaphtholHCID 11776TriphenylphosphineHCID 2734883(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl esterHCID 5363146Diisopropyl azodicarboxylate

Product 1

HCID 67406330(2S,4S)-1-tert-Butyl 2-methyl 4-(naphthalen-2-yloxy)pyrrolidine-1,2-dicarboxylateYield 84.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred mixture of methyl (2S,4R)-1-tert-butoxycarbonyl-4-hydroxy-2-pyrrolidinylcarboxylate (4.22 g, 17.2 mmol), 2-naphthol (2.73 g, 18.9 mmol) and PPh3 (4.96 g, 18.9 mmol) in THF (80 ml) was added DIAD (3.72 ml, 18.9 mmol) at room temperature under an atmosphere of nitrogen. After stirring over night, the mixture was concentrated in vacuo. The residue was chromatographed on silica gel [600 g, CHCl3/EtOAc (10/1)], to give methyl (2S,4S)-1-tert-butoxycarbonyl-4-(2-naphthyloxy)-2-pyrrolidinylcarboxylate (5.37 g), which was used without further purification.

Workup

  1. concentrationthe mixture was concentrated in vacuo
  2. customThe residue was chromatographed on silica gel [600 g, CHCl3/EtOAc (10/1)]

Sources & evidence

ORD record
ord-2bfba0262c834987bf5d9a5e61244c16
Source dataset
uspto-grants-2004_06
Patent number
US06756378B2

Reaction notes

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