Hydrochloric Acid → 9-Chloromethyl-7-oxo-2,3,6,7-tetrahydro[1,4]dioxino[2,3-g]quinoline-8-carboxylic acid ethyl ester

HRID 357520

Reaction equation

HRID 357520 reaction equation
[NH2:1][C:2]1[C:3]([C:12](=O)[CH2:13][Cl:14])=[CH:4][C:5]2[O:10][CH2:9][CH2:8][O:7][C:6]=2[CH:11]=1.C(N([CH2:21][CH3:22])CC)C.C([CH:25]([C:29](Cl)=[O:30])[C:26](Cl)=[O:27])C.Cl.[OH2:33]>C(#N)C>[CH2:21]([O:33][C:29]([C:25]1[C:26](=[O:27])[NH:1][C:2]2[CH:11]=[C:6]3[O:7][CH2:8][CH2:9][O:10][C:5]3=[CH:4][C:3]=2[C:12]=1[CH2:13][Cl:14])=[O:30])[CH3:22]

Participants

7

Reactant 5

HCID 313Hydrochloric AcidHCID 962WaterHCID 8471Triethylamine2×HCID 102428551-(7-Amino-2,3-dihydro-1,4-benzodioxin-6-yl)-2-chloroethan-1-oneHCID 109209242-Ethylpropanedioyl dichloride

Product 1

HCID 110672879-Chloromethyl-7-oxo-2,3,6,7-tetrahydro[1,4]dioxino[2,3-g]quinoline-8-carboxylic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a mixture of 1-(7-amino-2,3-dihydro-benzo[1,4]dioxin-6-yl)-2-chloro-ethanone (230 g. 1.01 mol) prepared as in example 15, in acetonitrile (1.5 L) and triethylamine (197 mL, 1.41 mol, 1.4 eq) is added ethyl malonyl chloride (180 mL, 1.41 mol, 1.4 eq) over 0.5 h while keeping the reaction temperature less than 30° C. with an ice bath. After the addition is complete the reaction is stirred 1.5 h at room temperature. A second charge of triethylamine (140 mL, 1.01 mol, 1.0 eq) is added and the reaction is stirred for 4.5 hours. Water (2.1 L) is added slowly followed by conc. HCl (115 mL). The slurry is stirred overnight at rt, filtered, and the solid washed with water (460 mL). The solid is then dried under high vacuum (about 1 mm Hg) at 40° C. to yield 9-chloromethyl-7-oxo-2,3,6,7-tetrahydro[1,4]dioxino[2,3-g]quinoline-8-carboxylic acid ethyl ester as a yellow solid. HRMS (EI+): calc for C15H14NO5Cl: 323.0561, Found: 323.0556.

Workup

  1. customthe reaction temperature less than 30° C.
  2. additionAfter the addition
  3. additionis added
  4. stirringthe reaction is stirred for 4.5 hours
  5. stirringThe slurry is stirred overnight at rt
  6. filtrationfiltered
  7. washthe solid washed with water (460 mL)
  8. customThe solid is then dried under high vacuum (about 1 mm Hg) at 40° C.

Sources & evidence

ORD record
ord-3eabed383d4b4e838eebc63f0d0f8ad0
Source dataset
uspto-grants-1998_11
Patent number
US05840898

Linked notes

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