Formaldehyde → 4-(Morpholin-4-ylmethyl)-1H-pyrrole-2-carbaldehyde

Participants

Reaction Steps

To a solution of morpholine (0.38 mole) in acetic acid (120 ml) at 0° C. there is added a solution of 1H-pyrrole-2-carbaldehyde (0.32 mole) in acetic acid (100 ml). Formaldehyde (37% aq., 26 ml) is then added dropwise. The reaction mixture is then stirred for 65 hours at ambient temperature. The mixture is concentrated (about 50 ml) and cooled in an ice bath. The pH of the solution is made alkaline (pH=12) using 20% aqueous sodium hydroxide solution. The product is extracted with dichloromethane (DCM) (3×250 ml). The organic phases are combined. The organic phase obtained is washed with saturated aqueous NaCl solution, dried over sodium sulphate, filtered and evaporated to dryness. The residue obtained (oil) is purified on silica gel (SiO2, gradient DCM/MeOH) to yield the title product.

Provenance & Evidence