Reaktion #1348

Reaktionsgleichung

4-(2-chlorophenyl)-2-(2-hydroxyimino-ethoxymethyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarboxylic acid 3-ethyl 5-methyl ester

ammonium formate

→

title compound

Ausbeute 60.7%

2-[(2-Aminoethoxy)methyl]-4-(2-chlorophenyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarboxylic acid 3-ethyl 5-methylester

Ausbeute 60.7%

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas refluxed for 5 h under a nitrogen atmosphere
2. 2
   Filtrationthe mixture was filtered through a pad of celite
3. 3
   EinengenThe filtrate was concentrated in vacuo
4. 4
   SonstigePurification of the residue by flash chromatography on silica gel (grade 9385, Merck, 230-400 mesh, 60 Å)
5. 5
   workup.ADDITIONa solvent mixture of dichloromethane and methanol (9:1; 100 mL), and dichloromethane, methanol and ammonium hydroxide (90:10:1; 500 mL) as eluent

Vorschrift

A mixture of 4-(2-chlorophenyl)-2-(2-hydroxyimino-ethoxymethyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarboxylic acid 3-ethyl 5-methyl ester (IBa, 150 mg), palladium hydroxide on carbon (10 mg) and ammonium formate (224 mg) in methanol (10 mL) was refluxed for 5 h under a nitrogen atmosphere. On cooling to room temperature, the mixture was filtered through a pad of celite. The filtrate was concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (grade 9385, Merck, 230-400 mesh, 60 Å) using a solvent mixture of dichloromethane and methanol (9:1; 100 mL), and dichloromethane, methanol and ammonium hydroxide (90:10:1; 500 mL) as eluent afforded the title compound (IAa 88 mg).

Quelle