Dicyclohexylcarbodiimide → (S)-phenylmethyl-[1-methyl-2-oxo-2-(1H-pyrrol-1-ylamino)ethyl]carbamate

HRID 327818Notes

Reaction equation

HRID 327818 reaction equation
[C:1]([NH:11][C@H:12]([C:14]([OH:16])=O)[CH3:13])([O:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=[O:2].[NH2:17][N:18]1[CH:22]=[CH:21][CH:20]=[CH:19]1.C1CCC(N=C=NC2CCCCC2)CC1>C(Cl)Cl>[C:5]1([CH2:4][O:3][C:1](=[O:2])[NH:11][C@@H:12]([CH3:13])[C:14](=[O:16])[NH:17][N:18]2[CH:22]=[CH:21][CH:20]=[CH:19]2)[CH:6]=[CH:7][CH:8]=[CH:9][CH:10]=1

Participants

5

Reactant 3

HCID 10868DicyclohexylcarbodiimideHCID 1365891-AminopyrroleHCID 736104N-carbobenzyloxyalanine

Product 1

HCID 15838188(S)-phenylmethyl-[1-methyl-2-oxo-2-(1H-pyrrol-1-ylamino)ethyl]carbamateYield 81.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of carbobenzyloxy-L-alanine (10.0 g) and N-aminopyrrole (3.68 g) in dry DCM (224 ml) was added DCC (9.71 g) at 0° C. under nitrogen. The cooling bath was removed after ten minutes and the reaction mixture was allowed to stir at room temperature for 17 hours. The mixture was filtered and the solid DCU filter cake was washed with hot ethyl acetate. Concentration of the combined filtrate gave the crude product. Recrystallization from ethyl acetate/hexane afforded 10.46 g of the product as a solid, m.p. 169°-171° C.

Workup

  1. customThe cooling bath was removed after ten minutes
  2. filtrationThe mixture was filtered
  3. filtrationthe solid DCU filter cake
  4. washwas washed with hot ethyl acetate
  5. customConcentration of the combined filtrate gave the crude product
  6. customRecrystallization from ethyl acetate/hexane

Sources & evidence

ORD record
ord-274589b3a6b34f9f929020c7ac80ae60
Source dataset
uspto-grants-1993_12
Patent number
US05274116

Reaction notes

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