Dicyclohexylcarbodiimide → (+/-)-Phenylmethyl-[1-(hydroxymethyl)-2-oxo-2-(1H-pyrrol-1-ylamino)ethyl]carbamate
Reaction equation
[NH2:1][N:2]1[CH:6]=[CH:5][CH:4]=[CH:3]1.C1CCC(N=C=NC2CCCCC2)CC1.[C:22]([NH:32][CH:33]([C:36](O)=[O:37])[CH2:34][OH:35])([O:24][CH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)=[O:23]>C(Cl)Cl>[C:26]1([CH2:25][O:24][C:22](=[O:23])[NH:32][CH:33]([CH2:36][OH:37])[C:34](=[O:35])[NH:1][N:2]2[CH:6]=[CH:5][CH:4]=[CH:3]2)[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1Participants
5
Procedure
To a solution of 1-aminopyrrole (4.92 g) and DCC (6.18 g) in dry DCM (100 ml) was added carbobenzyloxy-D,L-serine (7.18 g) in small portions over a period of about 1 hour. After stirring overnight at room temperature, the precipitate was removed by filtration, and stirred in boiling ethyl acetate. The mixture was filtered and the filtrate was combined with the filtrate of the reaction mixture and evaporated to dryness. The residue was purified by flash column chromatography (silica gel, DCM/methanol 20:1) and the appropriate fractions were concentrated. Recrystallization of the residue from ethyl acetate afforded 4.68 g of the product as a powder, m.p. 153°-154° C.
Workup
- customthe precipitate was removed by filtration
- stirringstirred
- filtrationThe mixture was filtered
- customevaporated to dryness
- customThe residue was purified by flash column chromatography (silica gel, DCM/methanol 20:1)
- concentrationthe appropriate fractions were concentrated
- customRecrystallization of the residue from ethyl acetate
Sources & evidence
- ORD record
- ord-c0974c84ed4b4283acca9fa37c0d9b53
- Source dataset
- uspto-grants-1996_12
- Patent number
- US05580987
Reaction notes
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