Imidazole → N'-((2R,3S)-3-(tert-butyldimethylsilyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)butanoyl)-4-nitrobenzohydrazide

HRID 470881Notes

Reaction equation

HRID 470881 reaction equation
[Cl:1][C:2]1[C:3]([CH3:30])=[C:4]([NH:10][C@H:11]([C@H:27]([OH:29])[CH3:28])[C:12]([NH:14][NH:15][C:16](=[O:26])[C:17]2[CH:22]=[CH:21][C:20]([N+:23]([O-:25])=[O:24])=[CH:19][CH:18]=2)=[O:13])[CH:5]=[CH:6][C:7]=1[C:8]#[N:9].[CH3:31][C:32]([Si:35](Cl)([CH3:37])[CH3:36])([CH3:34])[CH3:33].N1C=CN=C1>CN(C=O)C>[Si:35]([O:29][C@@H:27]([CH3:28])[C@@H:11]([NH:10][C:4]1[CH:5]=[CH:6][C:7]([C:8]#[N:9])=[C:2]([Cl:1])[C:3]=1[CH3:30])[C:12]([NH:14][NH:15][C:16](=[O:26])[C:17]1[CH:22]=[CH:21][C:20]([N+:23]([O-:25])=[O:24])=[CH:19][CH:18]=1)=[O:13])([C:32]([CH3:34])([CH3:33])[CH3:31])([CH3:37])[CH3:36]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 67006072N'-((2R,3R)-2-(3-Chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)-4-nitrobenzohydrazide

Product 1

HCID 67005876N'-((2R,3S)-3-(tert-butyldimethylsilyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)butanoyl)-4-nitrobenzohydrazideYield 82%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
0 °C

Procedure

N′-((2R,3R)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)-4-nitrobenzo-hydrazide (2.0 g, 4.63 mmol) was added to DMF (100 mL), followed by addition of TBDMS-Cl (1.74 g, 11.6 mmol) and imidazole (1.58 g, 23.2 mmol) at 0° C. The solution was allowed to stir at 0° C. for 30 minutes and then at room temperature for overnight. The reaction was quenched with the addition of 200 mL brine and extract with EtOAc. Purification by flash column chromatography [EtOAc-hexanes (1:1) as eluent] afforded the title compound as a white solid (780 mg, 82%). 1H NMR (400 MHz, 4-acetone, δ in ppm) 9.88 (br s, 2H), 8.35 (d, J=6.7 Hz, 2H), 8.16 (d, J=6.7 Hz, 2H), 7.53 (d, J=7.5 Hz, 1H), 6.69 (d, J=7.5 Hz, 1H), 5.56 (d, J=6.6 Hz, 1H), 4.46-4.36 (m, 1H), 4.18-4.10 (m, 1H), 3.26 (s, 3H), 1.37 (d, J=7.4 Hz, 3H), 0.94 (s, 9H), 0.14 (s, 3H), 0.11 (s, 3H).

Workup

  1. waitat room temperature for overnight
  2. customThe reaction was quenched with the addition of 200 mL brine
  3. extractionextract with EtOAc
  4. customPurification by flash column chromatography [EtOAc-hexanes (1:1) as eluent]

Sources & evidence

ORD record
ord-593484c72f86463f96b0d74a9b34e6c9
Source dataset
uspto-grants-2014_01
Patent number
US08629167B2

Reaction notes

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