Reaktion #2045105

Reaktionsgleichung

Formaldehyde

benzamide

morpholine

→

Mannich base

Ausbeute 30.0%

N-Morpholin-4-ylmethyl-benzamide

Ausbeute 30.0%

Lösungsmittel

MeOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe resulting solution was cooled in an ice bath
2. 2
   workup.WAITto stand at RT for another 10 min
3. 3
   Sonstigewas placed in a 70° C.
4. 4
   Sonstigefor 2 h
5. 5
   SonstigeThe solvents were evaporated
6. 6
   Sonstigethe isolated residue (a waxy solid) was chromatographed on a Chromatotron with dichloromethane/methanol mixture, 5:0.2 to 5:0.6 as eluent
7. 7
   SonstigeThe desired fractions were collected
8. 8
   Sonstigethe solvents were evaporated

Vorschrift

To a stirred solution of benzamide (0.30 g, 2.5 mmol) in MeOH (5 mL) was added morpholine (0.22 g, 2.5 mmol) and the resulting solution was cooled in an ice bath. Formaldehyde (0.215 mL, 2.5 mmol, 37% in water) was then added and the stirred solution was left on ice for 5 min and then it was allowed to stand at RT for another 10 min, and then it was placed in a 70° C. oil bath for 2 h. The solvents were evaporated and the isolated residue (a waxy solid) was chromatographed on a Chromatotron with dichloromethane/methanol mixture, 5:0.2 to 5:0.6 as eluent. The desired fractions were collected and the solvents were evaporated giving Mannich base 18 (0.145 g, 30%) as an oil which solidified in the freezer.

Quelle