Formaldehyde → (3R)-3-Methyl-4-({1-[4-(trifluoromethyl)phenyl]-1H-tetrazol-5-yl}methyl)morpholine hydrochloride

Participants

Reaction Steps

To a solution of (3R)-3-methylmorpholine hydrochloride (122 mg, 0.887 mmol, Tyger Scientific, Ewing, USA) and triethylamine (0.124 mL, 0.887 mmol) in methanol (2 mL) was added formaldehyde (37% aqueous) (0.066 mL, 0.887 mmol). The reaction mixture was stirred at room temperature for 2 hours before the addition of 4-(trifluoromethyl)phenyl isocyanide (152 mg, 0.887 mmol) and trimethylsilylazide (0.118 mL, 0.887 mmol). The reaction mixture was stirred at room temperature overnight (approximately 18 hours) and the solvent removed under vacuum. The residue was purified by MDAP. Fractions containing the desired compound were combined and the solvent removed. The residue was partitioned between saturated NaHCO3 (2 mL) and DCM (5 ml). The organic layer was collected via a hydrophobic frit and the solvent removed under a stream of argon. The compound was dissolved in a minimum of diethyl ether before the addition of 1N HCl in diethyl ether (2 mL) leading to precipitation. The ether was decanted and the precipitate dried under vacuum to yield the title compound as a pale yellow solid (105 mg).

Provenance & Evidence