Water → (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-6-(bis((1-methyl-1H-imidazol-2-yl)methyl)amino)hexanoic acid

HRID 1855256Notes

Reaction equation

[NH:1]([C:11]([O:13][CH2:14][CH:15]1[C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[C:21]2[C:16]1=[CH:17][CH:18]=[CH:19][CH:20]=2)=[O:12])[C@H:2]([C:8]([OH:10])=[O:9])[CH2:3][CH2:4][CH2:5][CH2:6][NH2:7].Cl.[CH3:29][N:30]1[CH:34]=[CH:33][N:32]=[C:31]1[CH:35]=O.[BH-](O[C:47]([CH3:49])=O)(OC(C)=O)OC(C)=O.[Na+].O>ClCCCl>[CH:17]1[C:16]2[CH:15]([CH2:14][O:13][C:11]([NH:1][C@@H:2]([CH2:3][CH2:4][CH2:5][CH2:6][N:7]([CH2:35][C:31]3[N:30]([CH3:29])[CH:47]=[CH:49][N:32]=3)[CH2:35][C:31]3[N:30]([CH3:29])[CH:34]=[CH:33][N:32]=3)[C:8]([OH:10])=[O:9])=[O:12])[C:27]3[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=3)[C:21]=2[CH:20]=[CH:19][CH:18]=1

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of Fmoc-Lys-OH.HCl (1.822 g, 4.5 mmol) and 1-methyl-1H-imidazole-2-carbaldehyde (1.10 g, 10 mmol) in DCE (50 mL) was stirred at 75° C. for 30 min under nitrogen. The reaction mixture was cooled to 0° C., and treated with NaBH(OAc)3 (3.165 g, 15 mmol). The reaction mixture was stirred at room temperature for overnight and decomposed with water. The reaction mixture was extracted with DCM, the organic layer dried and concentrated under reduced pressure. The residue was purified by flash chromatography over silica gel to afford (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-6-(bis((1-methyl-1H-imidazol-2-yl)methyl)amino)hexanoic acid (2.30 g, 92%). MS (ESI), 557 (M+H)+.

Workup

extractionThe reaction mixture was extracted with DCM
customthe organic layer dried
concentrationconcentrated under reduced pressure
customThe residue was purified by flash chromatography over silica gel

Sources & evidence

ORD record: ord-65df90fbd87845ce9f4bde276a017d20
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08962799B2

Reaction notes

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