Water → Mono-Propargyl Curcumin

HRID 62587Notes

Reaction equation

HRID 62587 reaction equation
[CH3:1][O:2][C:3]1[C:8]([OH:9])=[CH:7][CH:6]=[C:5](/[CH:10]=[CH:11]/[C:12]([CH2:14][C:15](/[CH:17]=[CH:18]/[C:19]2[CH:27]=[C:24]([O:25][CH3:26])[C:22]([OH:23])=[CH:21][CH:20]=2)=[O:16])=[O:13])[CH:4]=1.C([O-])([O-])=O.[K+].[K+].[CH2:34](Br)[C:35]#[CH:36].O>CN(C=O)C>[CH2:36]([CH:14]([C:12](/[CH:11]=[CH:10]/[C:5]1[CH:4]=[C:3]([O:2][CH3:1])[C:8]([OH:9])=[CH:7][CH:6]=1)=[O:13])[C:15](=[O:16])/[CH:17]=[CH:18]/[C:19]1[CH:27]=[C:24]([C:22]([OH:23])=[CH:21][CH:20]=1)[O:25][CH3:26])[C:35]#[CH:34]

Participants

6

Reactant 4

HCID 962WaterHCID 7842Propargyl bromideHCID 11430Potassium CarbonateHCID 969516Curcumin

Product 1

HCID 88539422Mono-Propargyl CurcuminYield 47%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Curcumin (5 g, 13.57 mmol) and K2CO3 (1.88 g, 13.62 mmol) were dissolved in 60 mL DMF, and 1.62 g (13.61 mmol) of propargyl bromide was added. The mixture was stirred at room temperature under Ar for 49 h. H2O was added to the mixture and solvent was removed under vacuum. The product was purified on column chromatography, eluting with CH2Cl2: hexane 50:50—CH2Cl2. Yield 47%. NMR 1H (CDCl3), δ (ppm): 2.54 (s, 1H); 3.94 (d, 6H); 4.81 (d, 2H); 5.82 (s, 1H); 5.93 (s, 1H); 6.47-6.52 (t, 2H); 6.93-7.15 (m, 6H); 7.59-7.61 (dd, 2H). MS (ESI) calcd. for C24H22O6: 406.43. found: 407.2 [M+H]+, 445.2 [M++K].

Workup

  1. customwas removed under vacuum
  2. customThe product was purified on column chromatography
  3. washeluting with CH2Cl2

Sources & evidence

ORD record
ord-51e4bb9478f04c8f92aa3f79e18fc043
Source dataset
uspto-grants-2016_09
Patent number
US09447023B2

Reaction notes

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