Water → 2-(4-Fluoro-2-methyl-phenylamino)-1,6,7-trimethyl-1,8-dihydro-imidazo[4,5-h]isoquinolin-9-one

HRID 562436Notes

Reaction equation

HRID 562436 reaction equation
C(O[C:4](=O)[C:5]([C:10]1[CH:28]=[CH:27][C:13]2[N:14]=[C:15]([NH:18][C:19]3[CH:24]=[CH:23][C:22]([F:25])=[CH:21][C:20]=3[CH3:26])[N:16]([CH3:17])[C:12]=2[C:11]=1[C:29]#[N:30])(C)[C:6](=O)[CH3:7])C.O.S(=O)(=O)(O)[OH:34].[OH-].[NH4+]>C(O)(=O)C>[F:25][C:22]1[CH:23]=[CH:24][C:19]([NH:18][C:15]2[N:16]([CH3:17])[C:12]3[C:11]4[C:29](=[O:34])[NH:30][C:6]([CH3:7])=[C:5]([CH3:4])[C:10]=4[CH:28]=[CH:27][C:13]=3[N:14]=2)=[C:20]([CH3:26])[CH:21]=1

Participants

6

Reactant 4

HCID 962WaterHCID 1118Sulfuric AcidHCID 14923Ammonium HydroxideHCID 668323242-[4-cyano-2-(4-fluoro-2-methyl-phenylamino)-3-methyl-3H-benzoimidazol-5-yl]-2-methyl-3-oxo-butyric acid ethyl ester

Product 1

HCID 668326292-(4-Fluoro-2-methyl-phenylamino)-1,6,7-trimethyl-1,8-dihydro-imidazo[4,5-h]isoquinolin-9-oneYield 89%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Conditions

Temperature
100 °C

Procedure

To a 500 mL round-bottom flask equipped with a magnetic stir-bar was added 2-[4-cyano-2-(4-fluoro-2-methyl-phenylamino)-3-methyl-3H-benzoimidazol-5-yl]-2-methyl-3-oxo-butyric acid ethyl ester (8.25 g, 1.95 mmole), followed by a freshly prepared mixture of water (25 mL), acetic acid (25 mL), and concentrated sulfuric acid (25 mL) at 60° C. The flask was fitted with a reflux condenser and heated to a bath temperature of 100° C. under a nitrogen atmosphere. After 5 hours, the reaction was allowed to cool to room temperature, and stirred for an additional 14 hours. The mixture was then poured onto ice and brought to a slightly basic pH by careful addition of concentrated ammonium hydroxide, while maintaining a temperature of less than 15° C. The resulting precipitate was isolated by filtration, and washed with several volumes of water. The solid was then slurried in methanol for 1 hour, and filtered. The isolated solid was washed with cold methanol until the filtrate was colorless, to provide 2-(4-fluoro-2-methyl-phenylamino)-1,6,7-trimethyl-1,8-dihydro-imidazo[4,5-h]isoquinolin-9-one (6.11 g, 89%) as a light gray solid. 1H NMR (400 MHz, DMSO-d6+TFA) δ 11.43 (br s, 1H), 10.49 (br s, 1H), 7.70-7.65 (m, 2H), 7.57 (dd, 1H, J1=5.5 Hz, J2=8.6 Hz), 7.37 (dd, 1H, J1=3.1 Hz, J2=9.8 Hz), 7.27 (td, 1H, J1=3.1 Hz, J2=11.7 Hz), 4.23 (s, 3H), 2.32 (app s, 6H), 2.23 (s, 3H); ESMS (m/z): 351 (M+1)+.

Workup

  1. customTo a 500 mL round-bottom flask equipped with a magnetic stir-bar
  2. customThe flask was fitted with a reflux condenser
  3. temperatureto cool to room temperature
  4. additionThe mixture was then poured onto ice
  5. temperaturewhile maintaining a temperature of less than 15° C
  6. customThe resulting precipitate was isolated by filtration
  7. washwashed with several volumes of water
  8. waitThe solid was then slurried in methanol for 1 hour
  9. filtrationfiltered
  10. washThe isolated solid was washed with cold methanol until the filtrate

Sources & evidence

ORD record
ord-721fd4c6f3d443b7891a26a191614840
Source dataset
uspto-grants-2011_11
Patent number
US08067395B2

Reaction notes

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