1-(2-isopropyloxazol-4-yl)-N-methylmethanamine → N-((N-Methyl-N-((2-isopropyl-4-oxazolyl)methyl)amino)carbonyl)-L-valine Methyl Ester

HRID 443129Notes

Reaction equation

HRID 443129 reaction equation
[CH3:1][O:2][C:3](=[O:21])[C@H:4]([CH:18]([CH3:20])[CH3:19])[NH:5][C:6]([O:8]C1C=CC([N+]([O-])=O)=CC=1)=O.[CH:22]([C:25]1[O:26][CH:27]=[C:28]([CH2:30][NH:31][CH3:32])[N:29]=1)([CH3:24])[CH3:23]>CN(C=O)C>[CH3:1][O:2][C:3](=[O:21])[C@H:4]([CH:18]([CH3:19])[CH3:20])[NH:5][C:6]([N:31]([CH3:32])[CH2:30][C:28]1[N:29]=[C:25]([CH:22]([CH3:23])[CH3:24])[O:26][CH:27]=1)=[O:8]

Participants

4

Reactant 2

HCID 108207841-(2-isopropyloxazol-4-yl)-N-methylmethanamineHCID 15344176Methyl N-[(4-nitrophenoxy)carbonyl]-L-valinate

Product 1

HCID 10614961N-((N-Methyl-N-((2-isopropyl-4-oxazolyl)methyl)amino)carbonyl)-L-valine Methyl EsterYield 54.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

A solution of N-(((4-nitrophenyl)oxy)carbonyl)-L-valine methyl ester (0.903 g, 0.00305 mol) in anhydrous DMF (6 mL) was added to a solution of 2-isopropyl-4-(((N-methyl)amino)methyl)oxazole (9, 0.470 g, 0.00305 mol) in anhydrous DMF (6 mL) under argon, and the yellow solution was stirred at room temperature for 30 min. Solvent was removed by rotary evaporation in vacuo and the resulting oil dried on high vacuum for 1 hr. The residue was applied to a 150 g SiO2 flash column and eluted with 20% EtOAc/CH2Cl2 and 3% MeOH/CH2Cl2. The material obtained after concentration of the product fractions was repurified on a 100 g SiO2 flash column with a gradient of MeOH/CH2Cl2 (1%, 2%, 3%) to obtain the desired compound as an oil (0.515 g, 0.00165 mol, 54%): 1H NMR (CDCl3) δ 0.97 (dd, J1 =9 Hz, J2 =6.9 Hz, 6H), 1.33 (d, J=6.9 Hz, 6H), 2.11-2.23 (m,1 H), 2.98 (s, 3H), 300-3.13 (m, 1H), 3.77 (s, 3H), 4.23-4.36 (m, 2H), 4.36-4.42 (m, 1H), 5.79-5.86 (br d, 1H), 7.46 (s, 1H). Mass spectrum: (M+H)+ =312.

Workup

  1. customSolvent was removed by rotary evaporation in vacuo
  2. customthe resulting oil dried on high vacuum for 1 hr
  3. washeluted with 20% EtOAc/CH2Cl2 and 3% MeOH/CH2Cl2
  4. customThe material obtained after concentration of the product fractions
  5. customwas repurified on a 100 g SiO2 flash column with a gradient of MeOH/CH2Cl2 (1%, 2%, 3%)

Sources & evidence

ORD record
ord-ba454ee6d96445dca7ba1eb181036094
Source dataset
uspto-grants-1999_04
Patent number
US05892052

Reaction notes

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