Formaldehyde → HCID 68973728, compound

Participants

Reaction Steps

At ambient temperature, to 0.83 g (1.72 mmol) of the compound obtained in Step C of Example 84, dissolved in 32 mL of acetonitrile, there are added, all at once, 1.4 mL (17.2 mmol) of 37% aqueous formaldehyde solution and then 0.22 g (3.44 mmol) of sodium cyanoborohydride. After stirring for 45 minutes at ambient temperature, concentration is carried out and the residue is taken up in 30 mL of water; the aqueous phase is extracted twice with 30 mL of dichloromethane; the organic phases are combined, washed with 30 mL of water and dried over magnesium sulphate. After concentration, the residue is chromatographed over silica (eluant: dichloromethane/ethanol/ammonia 95/5/0.5) to yield the desired compound in the form of the base.

Provenance & Evidence