Reaktion #459720

Reaktionsgleichung

dimethylformamide

2-acetamido-4-hydroxypteridine-6-aldehyde

ethyl p-aminobenzoate

dimethylamine borane

→

ethyl N2 -acetylpteroate

Lösungsmittel

acetic acid

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe mixture is stirred for an additional 20 minutes
2. 2
   Temperaturheated to 60° C for 10 minutes
3. 3
   Temperaturcooled to 25° C
4. 4
   FiltrationThe precipitate is collected by filtration
5. 5
   Waschenwashed with acetic acid and ether
6. 6
   Sonstigedried
7. 7
   SonstigeThe crude product is crystallized from 50 ml of dimethylformamide, with dilution by 20 ml ether

Vorschrift

A mixture of 3.07 g (10 m ole) of the dimethylformamide solvate of 2-acetamido-4-hydroxypteridine-6-aldehyde, 3.30 g (20 mmole) of ethyl p-aminobenzoate and 50 ml of glacial acetic acid is stirred at ambient temperature for 30 minutes. To the resulting suspension is added dropwise 1.00 g of dimethylamine borane in 15 ml of acetic acid. The mixture is stirred for an additional 20 minutes, heated to 60° C for 10 minutes and cooled to 25° C. The precipitate is collected by filtration, washed with acetic acid and ether and then dried. The crude product is crystallized from 50 ml of dimethylformamide, with dilution by 20 ml ether, to yield ethyl N2 -acetylpteroate.

Quelle