Imidazole → HCID 21934562, compound

HRID 1241442Notes

Reaction equation

HRID 1241442 reaction equation
O[CH2:2][CH2:3][C:4]1[CH:5]=[CH:6][C:7]2[N:12]([CH3:13])[CH2:11][CH2:10][N:9]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C:8]=2[N:21]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N1C=CN=C1.[I:46]I>CCOCC.CC#N>[I:46][CH2:2][CH2:3][C:4]1[CH:5]=[CH:6][C:7]2[N:12]([CH3:13])[CH2:11][CH2:10][N:9]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C:8]=2[N:21]=1

Participants

7

Reactant 4

HCID 795ImidazoleHCID 807IodineHCID 11776TriphenylphosphineHCID 21934548HCID 21934548, compound

Product 1

HCID 21934562HCID 21934562, compoundYield 86%

Reagents, catalysts & solvents 2

HCID 3283Diethyl EtherSolvent2×HCID 6342AcetonitrileSolvent

Conditions

Temperature
0 °C

Procedure

The mixture of tert-butyl 6-(2-hydroxyethyl)-1-methyl-2,3-dihydropyrido[2,3-b]pyrazine-4(1H)-carboxylate (5.6 g, 19.09 mmol), triphenylphosphine (6.51 g, 24.82 mmol), imidazole (1.82 g, 26.72 mmol), and a mixture of CH3CN and dry ether (1:1) was cooled to 0° C. Iodine (6.78 g, 26.72 mmol) was slowly added. The resulting mixture was stirred for 2 hour and then ether (150 mL) was added, washed successively with saturated aqueous Na2S2O3 and brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by flash chromatography (silica, 20% EtOAC/Hex) to afford a yellow solid (6.6 g, 86% yield). H NMR (CDCl3) δ 1.55 (s, 9H), 2.93 (s, 3H), 3.18 (t, 2H), 3.30 (t, 2H), 3.458(t, 2H), 3.85 (t, 2H), 6.85(q, 2H). LC-MS (M+H) 404.

Workup

  1. washwashed successively with saturated aqueous Na2S2O3 and brine
  2. dry with materialdried over Na2SO4
  3. concentrationconcentrated under reduced pressure
  4. customThe residue was purified by flash chromatography (silica, 20% EtOAC/Hex)

Sources & evidence

ORD record
ord-66bcee5b362b4dd6a6f0b9fe628d5889
Source dataset
uspto-grants-2006_10
Patent number
US07115596B2

Reaction notes

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