Réaction #50501

Équation de réaction

6-chloronicotinaldehyde

2-aminoethanethiol

→

2-(2-chloro-5-pyridyl)thiazolidine

Rendement 89.9%

Solvants

benzene

Conditions de réaction

Traitement

1. 1
   Températurewas heated
2. 2
   Autrewhile removing water as an azeotrope
3. 3
   AutreAfter the reaction, benzene
4. 4
   workup.DISTILLATIONwas distilled off under reduced pressure, and further volatile materials
5. 5
   Autrewere removed at 1 mmHg and 70° C.

Mode opératoire

A solution composed of 6-chloronicotinaldehyde (14.2 g), 2-aminoethanethiol (7.7 g) and benzene (80 ml) was heated with stirring for 5 hours while removing water as an azeotrope. After the reaction, benzene was distilled off under reduced pressure, and further volatile materials were removed at 1 mmHg and 70° C. to give 2-(2-chloro-5-pyridyl)thiazolidine (18 g) as a residue. Ten grams of 2-(2-chloro-5-pyridyl)thiazolidine was dissolved in 100 ml of ethanol, and sodium borohydride was added. With stirring, the mixture was gradually heated and thereafter refluxed for 1 hour. Ethanol was distilled off under reduced pressure, and chloroform was added to the residue. Insoluble materials were separated by filtration and the chloroform layer was washed with water and dehydrated. Chloroform was distilled off under reduced pressure to give the desired N-(2-chloro-5-pyridylmethyl)2-aminoethanethiol (8.3 g).

Source