Hydrochloric Acid → 6-Methoxy-7-(3-methylsulphonylpropoxy)-3,4-dihydroquinazolin-4-one

HRID 1791593Notes

Reaction equation

HRID 1791593 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13][CH2:14][CH2:15][CH2:16][S:17]([CH3:20])(=[O:19])=[O:18])[N:9]=[CH:8][N:7](COC(=O)C(C)(C)C)[C:6]2=[O:29].[OH-].[Na+].CC1C=CC(COC(NNC(C2C=NC=CN=2)=O)=O)=CC=1.Cl>CO.O>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13][CH2:14][CH2:15][CH2:16][S:17]([CH3:20])(=[O:19])=[O:18])[N:9]=[CH:8][NH:7][C:6]2=[O:29]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 478568p-tolylmethyl N-(pyrazine-2-carbonylamino)carbamateHCID 220305896-Methoxy-7-(3-methylsulphonylpropoxy)-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one

Product 1

HCID 1357631126-Methoxy-7-(3-methylsulphonylpropoxy)-3,4-dihydroquinazolin-4-oneYield 94.2%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 962WaterSolvent

Procedure

6-Methoxy-7-(3-methylsulphonylpropoxy)-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (7 g, 17 mmol) was suspended in methanol and 2M sodium hydroxide (3.3 ml, 6.6 mmol) was added with continuous stirring. The reaction mixture became homogeneous after 15 minutes. After a further 45 minutes water was added (7 ml) and the reaction mixture was adjusted to pH10 with 2M hydrochloric acid. The precipitate (a white solid) was collected by filtration, washed with water and dried over phosphorus pentoxide under vacuum to give 6-methoxy-7-(3-methylsulphonylpropoxy)-3,4-dihydroquinazolin-4-one (5 g, 90%).

Workup

  1. filtrationThe precipitate (a white solid) was collected by filtration
  2. washwashed with water
  3. dry with materialdried over phosphorus pentoxide under vacuum

Sources & evidence

ORD record
ord-f76face8e9de472a8b5987c3e4ec04f2
Source dataset
uspto-grants-2006_07
Patent number
US07074800B1

Reaction notes

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