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

HRID 1372579Notes

Reaction equation

HRID 1372579 reaction equation
CC(OC(/N=N/C(OC(C)C)=O)=O)C.[C:15]([O:19][C:20]([N:22]1[CH2:26][C@@H:25]([OH:27])[CH2:24][C@H:23]1[C:28]([O:30][CH3:31])=[O:29])=[O:21])([CH3:18])([CH3:17])[CH3:16].[CH:32]1[C:41]2[C:36](=[CH:37][CH:38]=[CH:39][CH:40]=2)[CH:35]=[CH:34][C:33]=1O.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C1COCC1>[C:15]([O:19][C:20]([N:22]1[CH2:26][C@@H:25]([O:27][C:34]2[CH:33]=[CH:32][C:41]3[C:36](=[CH:37][CH:38]=[CH:39][CH:40]=3)[CH:35]=2)[CH2:24][C@H:23]1[C:28]([O:30][CH3:31])=[O:29])=[O:21])([CH3:18])([CH3:17])[CH3:16]

Participants

6

Reactant 4

HCID 86632-NaphtholHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 10752873N-Boc-cis-4-hydroxy-L-proline methyl ester

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

DIAD (3.72 ml, 18.9 mmol) was added to a solution of methyl (2S,4S)-1-tert-butoxycarbonyl-4-hydroxy-2-pyrrolidinylcarboxylate (4.22 g, 17.2 mmol), 2-naphthol (2.73 g, 18.9 mmol) and triphenylphosphine (4.96 g, 18.9 mmol) in THF (80 ml) under stirring at room temperature in a nitrogen gas stream. The mixture was stirred overnight at room temperature. The residue, which had been obtained by concentrating the reaction mixture under reduced pressure, was purified by chromatography on a silica gel column (silica gel: 600 g), whereby from chloroform/ethyl acetate (10/1) eluate fractions, the title compound (5.37 g) was obtained as an amorphous substance (this compound was provided for the subsequent reaction without further purification).

Workup

  1. stirringThe mixture was stirred overnight at room temperature
  2. customThe residue, which had been obtained
  3. concentrationby concentrating the reaction mixture under reduced pressure
  4. customwas purified by chromatography on a silica gel column (silica gel: 600 g), whereby from chloroform/ethyl acetate (10/1) eluate fractions

Sources & evidence

ORD record
ord-e1333844a543487dae5349aa1cdaa437
Source dataset
uspto-grants-2007_01
Patent number
US07157487B2

Reaction notes

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