Triethylamine → 4-[2-(3-Nitro-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 1666996Notes

Reaction equation

HRID 1666996 reaction equation
Br[CH2:2][C:3]1[N:8]=[C:7]2[N:9]=[C:10]([C:12]3[CH:17]=[CH:16][CH:15]=[C:14]([N+:18]([O-:20])=[O:19])[CH:13]=3)[O:11][C:6]2=[CH:5][CH:4]=1.CCN(CC)CC.[C:28]([N:35]1[CH2:40][CH2:39][NH:38][CH2:37][CH2:36]1)([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29]>CC#N>[C:31]([O:30][C:28]([N:35]1[CH2:40][CH2:39][N:38]([CH2:2][C:3]2[N:8]=[C:7]3[N:9]=[C:10]([C:12]4[CH:17]=[CH:16][CH:15]=[C:14]([N+:18]([O-:20])=[O:19])[CH:13]=4)[O:11][C:6]3=[CH:5][CH:4]=2)[CH2:37][CH2:36]1)=[O:29])([CH3:34])([CH3:32])[CH3:33]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 143452tert-Butyl piperazine-1-carboxylateHCID 596800675-Bromomethyl-2-(3-nitro-phenyl)-oxazolo[4,5-b]pyridine

Product 1

HCID 596799094-[2-(3-Nitro-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

5-Bromomethyl-2-(3-nitro-phenyl)-oxazolo[4,5-b]pyridine (250 mg, 0.75 mmol) was dissolved in 5 mL of CH3CN along with Et3N (0.200 mL, 1.5 mmol) and 140 mg of Boc-piperazine. The reaction mixture was stirred at room temperature for 18 hours. It was then concentrated and the resulting residue was mixed with 25 mL of CH2Cl2 and washed with brine. The organic layer was dried (Na2SO4) and concentrated to afford essentially quantitative yield of 4-[2-(3-nitro-phenyl)-oxazolo[4,5-b]pyridin-5-ylmethyl]-piperazine-1-carboxylic acid tert-butyl ester.

Workup

  1. concentrationIt was then concentrated
  2. additionthe resulting residue was mixed with 25 mL of CH2Cl2
  3. washwashed with brine
  4. dry with materialThe organic layer was dried (Na2SO4)
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-917d64087e78486f84c43c1c82a8b87b
Source dataset
uspto-grants-2011_10
Patent number
US08044198B2

Reaction notes

Loading…