2,3-Dichlorobenzaldehyde → HCID 70532932, compound

HRID 1649594Notes

Reaction equation

HRID 1649594 reaction equation
[Cl:1][C:2]1[C:9]([Cl:10])=[CH:8][CH:7]=[CH:6][C:3]=1[CH:4]=O.[NH2:11]/[C:12](/[CH3:18])=[CH:13]\[C:14]([O:16][CH3:17])=[O:15].[OH:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][O:26][C:27](=[O:32])[CH2:28][C:29]([CH3:31])=O>C(O)C>[OH:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][O:26][C:27]([C:28]1[CH:4]([C:3]2[CH:6]=[CH:7][CH:8]=[C:9]([Cl:10])[C:2]=2[Cl:1])[C:13]([C:14]([O:16][CH3:17])=[O:15])=[C:12]([CH3:18])[NH:11][C:29]=1[CH3:31])=[O:32]

Participants

5

Reactant 3

HCID 357452,3-DichlorobenzaldehydeHCID 643918Methyl 3-aminocrotonateHCID 204787006-Hydroxyhexyl 3-oxobutanoate

Product 1

HCID 70532932HCID 70532932, compoundYield 38%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

35.0 g (0.20 mole) of 2,3-dichlorobenzaldehyde, 23.0 g (0.20 mole) of methyl 3-aminocrotonate, 40.0 g (0.20 mole) of acetoacetic acid 6-hydroxyhexyl ester and 100 ml of ethanol were mixed and heated at reflux for 6 hours, and the resultant product was chromatographed on a silica gel column to obtain 34.7 g (yield 38.0%) of 1,4-dihydro-2,6-dimethyl-4-(2,3-dichlorophenyl)-3-methoxycarbonylpyridine-5-carboxylic acid 6-hydroxyhexyl ester as an oil. 13.7 g (0.03 mole) of this oil was dissolved together with 11.4 g (0.06 mole) of tosyl chloride in 100 ml of chloroform, to which was added dropwise 7.1 g (0.09 mole) of pyridine under ice cooling with stirring. This mixture was allowed to stand at room temperature for 2 hours, then 100 ml of water was added thereto, and stirring was continued for 3 hours. The chloroform layer of the resultant reaction mixture was separated, washed with 100 ml of 0.02 N sulfuric acid, 100 ml of water and 100 ml of saturated aqueous sodium bicarbonate successively, and dried over anhydrous sodium sulfate. This solution was concentrated, and the resultant residue was chromatographed on a silica gel column using a mixed solution of chloroform-methanol (the ratio by volume of 150:1) as an eluent to obtain 16.3 g (yield 89.0%) of 1,4-dihydro-2,6-dimethyl-4-(2,3-dichlorophenyl)-3-methoxycarbonylpyridine-5-carboxylic acid 6-tosyloxyhexyl ester. The IR and PMR spectra of this product were as follows.

Workup

  1. temperatureheated
  2. temperatureat reflux for 6 hours
  3. customthe resultant product was chromatographed on a silica gel column

Sources & evidence

ORD record
ord-7f86410841d44d3eb0f4250b30d378d2
Source dataset
uspto-grants-1983_11
Patent number
US04418197

Reaction notes

Loading…