Sodium borohydride → L-Proline 1,1-dimethylethyl ester

HRID 466828Notes

Reaction equation

HRID 466828 reaction equation
[C:1]([O:5][C:6](=[O:43])[C@@H:7]1[CH2:11][CH2:10][CH2:9][N:8]1CC(=O)[C@H](CC1C=CC=CC=1)NC(=O)[C@H](CCC(=O)N)NC(OCC1C=CC=CC=1)=O)([CH3:4])([CH3:3])[CH3:2].[BH4-].[Na+]>C(O)(C)C>[C:1]([O:5][C:6](=[O:43])[C@@H:7]1[CH2:11][CH2:10][CH2:9][NH:8]1)([CH3:4])([CH3:2])[CH3:3]

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 70042923HCID 70042923, compound

Product 1

HCID 6453108L-Proline 1,1-dimethylethyl ester

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

0.55 g (0.93 mmol) of N-[[N-[N-(benzyloxycarbonyl)-L-glutaminyl]-L-phenylalanyl]methyl]-L-proline tert.butyl ester, prepared as described in Example 6, was reduced in 15 ml of isopropanol in the presence of 90 mg of sodium borohydride as described in Example 7. After working-up, the product was chromatographed on silica gel using 2% methanol in chloroform for the elution. There were obtained 60 mg of isomer 1 of N-[3(S)-[[N-(benzyloxycarbonyl)-L-glutaminyl]amino]-2(R or S)-hydroxy-4-phenylbutyl]-L-proline tert.butyl ester in the form of a solid; Rf (System B): 0.37; MS: m/e 597 [M+H]+, and 65 mg of isomer 2 in the form of a solid; Rf (System B): 0.25; MS: m/e 597 [M+H]+.

Workup

  1. customthe product was chromatographed on silica gel using 2% methanol in chloroform for the elution

Sources & evidence

ORD record
ord-ff140c52dede4d6690919bdf371e1c76
Source dataset
uspto-grants-1992_10
Patent number
US05157041

Reaction notes

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