Ethanolamine → 3-cyano-N-(2-hydroxyethyl)-4-isopropoxybenzamide

HRID 1053751Notes

Reaction equation

[C:1]([C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]([CH3:15])[CH3:14])[C:6]([OH:8])=O)#[N:2].C(Cl)(=O)C(Cl)=O.[CH2:22]([CH2:24][NH2:25])[OH:23]>C(Cl)Cl.CN(C=O)C>[C:1]([C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]([CH3:15])[CH3:14])[C:6]([NH:25][CH2:24][CH2:22][OH:23])=[O:8])#[N:2]

Participants

Conditions

Temperature: 50 °C

Procedure

To a stirring suspension of 3-cyano-4-isopropoxybenzoic acid (1.0 g, 4.8 mmol) in DCM (20 mL) was added oxalyl chloride (3.7 g, 29.2 mmol) followed by two drops DMF. The reaction mixture was stirred at 50° C. for 2 h. The mixture was concentrated and the residue re-dissolved in DCM (10 mL). Ethanolamine (0.6 g, 9.7 mmol) and TEA (1.45 g, 14.4 mmol) were added and the reaction mixture was stirred overnight at room temperature. The resulting solid was filtered, washed with water, and dried to afford 1.0 g (83%) of 3-cyano-N-(2-hydroxyethyl)-4-isopropoxybenzamide which was used in the next step without purification. LCMS-ESI (m/z) calculated for C13H16N2O3: 248.3; found 249.0 [M+H]+, tR=2.41 min. 1H NMR (400 MHz, CDCl3) δ 8.02-7.79 (m, 2H), 6.97-6.87 (m, 1H), 6.71 (s, 1H), 4.65 (dt, J=12.1, 6.1 Hz, 1H), 3.82-3.70 (m, 2H), 3.56 (dd, J=10.2, 5.5 Hz, 2H), 1.96 (d, J=10.0 Hz, 1H), 1.40-1.29 (m, 6H).

Workup

concentrationThe mixture was concentrated
dissolutionthe residue re-dissolved in DCM (10 mL)
stirringthe reaction mixture was stirred overnight at room temperature
filtrationThe resulting solid was filtered
washwashed with water
customdried

Sources & evidence

ORD record: ord-70a3a30160e744aa9e8aa1d33c11b069
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09394264B2

Reaction notes

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