Dicyclohexylcarbodiimide → N-tert-butyloxycarbonyl-S-p-methoxybenzyl-D-cysteinyl-L-proline tert-butyl ester

HRID 1763820Notes

Reaction equation

HRID 1763820 reaction equation
[C:1]([O:5][C:6](=[O:12])[C@@H:7]1[CH2:11][CH2:10][CH2:9][NH:8]1)([CH3:4])([CH3:3])[CH3:2].OC1C2N=NNC=2C=CC=1.C1(N=C=NC2CCCCC2)CCCCC1.[C:38]([O:42][C:43]([NH:45][C@@H:46]([C:58](O)=[O:59])[CH2:47][S:48][CH2:49][C:50]1[CH:55]=[CH:54][C:53]([O:56][CH3:57])=[CH:52][CH:51]=1)=[O:44])([CH3:41])([CH3:40])[CH3:39]>C(Cl)Cl>[C:1]([O:5][C:6](=[O:12])[C@@H:7]1[CH2:11][CH2:10][CH2:9][N:8]1[C:58](=[O:59])[C@@H:46]([CH2:47][S:48][CH2:49][C:50]1[CH:51]=[CH:52][C:53]([O:56][CH3:57])=[CH:54][CH:55]=1)[NH:45][C:43]([O:42][C:38]([CH3:41])([CH3:40])[CH3:39])=[O:44])([CH3:4])([CH3:2])[CH3:3]

Participants

6

Reactant 4

HCID 10868DicyclohexylcarbodiimideHCID 6453108L-Proline 1,1-dimethylethyl esterHCID 6992555N-[(1,1-Dimethylethoxy)carbonyl]-S-[(4-methoxyphenyl)methyl]-D-cysteineHCID 178418300HCID 178418300, compound

Product 1

HCID 22805345N-tert-butyloxycarbonyl-S-p-methoxybenzyl-D-cysteinyl-L-proline tert-butyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of L-proline tert-butyl ester (0.85 g) and hydroxybenzotriazole (0.67 g) in methylene chloride (10 ml) chilled in an ice bath, dicyclohexylcarbodiimide (1.03 g) and N-tert-butyloxycarbonyl-S-p-methoxybenzyl-D-cysteine (1.7 g) are added in that order. After fifteen minutes, the ice bath is removed and the mixture is stirred at room temperature overnight. The precipitate is filtered off and the filtrate is washed with 10% potassium bisulfate, water, saturated sodium bicarbonate, and water. The organic phase is dried and concentrated to dryness in vacuo to give N-tert-butyloxycarbonyl-S-p-methoxybenzyl-D-cysteinyl-L-proline tert-butyl ester as an oil. Rf =0.2 (silica gel, chloroform).

Workup

  1. waitAfter fifteen minutes
  2. customthe ice bath is removed
  3. filtrationThe precipitate is filtered off
  4. washthe filtrate is washed with 10% potassium bisulfate, water, saturated sodium bicarbonate, and water
  5. customThe organic phase is dried
  6. concentrationconcentrated to dryness in vacuo

Sources & evidence

ORD record
ord-b6b83b67e3224307ba4e24538ab6e652
Source dataset
uspto-grants-1978_09
Patent number
US04113715

Reaction notes

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