Isobutyryl chloride → Tert-butyl 4-[3-(isobutyrylamino)phenyl]-3,6-dihydro-1(2H)-pyridinecarboxylate

HRID 1832148Notes

Reaction equation

HRID 1832148 reaction equation
[NH2:1][C:2]1[CH:3]=[C:4]([C:8]2[CH2:9][CH2:10][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:12][CH:13]=2)[CH:5]=[CH:6][CH:7]=1.C(N(C(C)C)CC)(C)C.[C:30](Cl)(=[O:34])[CH:31]([CH3:33])[CH3:32]>ClCCl>[C:30]([NH:1][C:2]1[CH:3]=[C:4]([C:8]2[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:10][CH:9]=2)[CH:5]=[CH:6][CH:7]=1)(=[O:34])[CH:31]([CH3:33])[CH3:32]

Participants

5

Reactant 3

HCID 62325Isobutyryl chlorideHCID 81531DiisopropylethylamineHCID 22049056tert-Butyl 4-(3-aminophenyl)-5,6-dihydropyridine-1(2H)-carboxylate

Product 1

HCID 16757164Tert-butyl 4-[3-(isobutyrylamino)phenyl]-3,6-dihydro-1(2H)-pyridinecarboxylateYield 52.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Into a solution of 4.00 g (16.0 mmol) of tert-butyl 4-(3-aminophenyl)-3,6-dihydro-1(2H)-pyridinecarboxylate and 5.60 mL (32.0 mmol) of diisopropylethylamine in 100 mL dichloromethane was slowly added 1.90 mL (19.0 mmol) of isobutyryl chloride. The reaction mixture was stirred at room temperature for 2 hours, washed with water, dried (MgSO4), and concentrated in vacuo. The residue was purified by column chromatography (silica, 50:46:3:1, hexanes:dichloromethane:methanol:isopropyl amine) to afford 2.90 g (52.0% yield) of the desired product: 1H NMR (400 MHz, CDCl3) δ 7.69 (s, 1H), 7.34 (d, 1H, J=7.8 Hz), 7.27 (t, 1H, J=7.8 Hz), 7.11 (d, 1H, J=7.8 Hz), 6.04 (s, 1H), 4.05 (s, 2H), 3.62 (apparent t, 2H, J=4.9 Hz), 2.51 (m, 3H), 1.49 (s, 9H), 1.25 (d, 6H, J=7.4 Hz); ESMS m/e: 345.5 (M+H)+. Anal. Calc. for C20H28N2O3+0.175CHCl3: C, 66.33; H, 7.77; N, 7.67. Found: C, 66.20; H, 7.41; N, 7.88.

Workup

  1. washwashed with water
  2. dry with materialdried (MgSO4)
  3. concentrationconcentrated in vacuo
  4. customThe residue was purified by column chromatography (silica, 50:46:3:1, hexanes:dichloromethane:methanol:isopropyl amine)

Sources & evidence

ORD record
ord-091333236138449595ef51ceeeb6ce98
Source dataset
uspto-grants-2006_06
Patent number
US07067534B1

Reaction notes

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