Diisopropylethylamine → HCID 66654532, compound

Participants

Reaction Steps

A solution of 3,3-dimethylmorpholine (49.7 mg, 0.328 mmol, commercially available, for example from Otava, Kiev, Ukraine or Tyger Scientific, Ewing, USA), 4-[5-(chloromethyl)-1H-tetrazol-1-yl]benzonitrile (60 mg, 0.273 mmol, may be prepared as described in Intermediate 10) and di-isopropylethylamine (0.110 mL, 0.628 mmol) in acetonitrile (0.7 mL) was heated to 120° C. for 30 minutes in a microwave reactor. The reaction mixture was allowed to cool and the solution purified by MDAP. Fractions containing the desired product were combined and the solvent removed. The residue was partitioned between saturated NaHCO3 (aq, 2 mL) and DCM (5 mL). The organic layer was collected via a hydrophobic frit and the solvent removed under vacuum. The residue was dissolved in a minimum of dichloromethane before the addition of 1N HCl in diethyl ether (1 mL). The compound was partitioned between saturated NaHCO3 (aq, 2 mL) and DCM (5 mL). The organic layer was collected via a hydrophobic frit and the solvent removed under vacuum. The crude product was further purified by silica chromatography (Biotage SP4, eluting 20% EtOAc in iso-hexane (3 column volumes) then a gradient from 20-60% EtOAc in iso-hexane (over 12 column volumes)) to yield a colourless gum. The residue was dissolved in a minimum of dichloromethane before the addition of 1N HCl in diethyl ether (1 mL). The solvent was removed under vacuum to yield a pale yellow solid which was triturated with methanol (0.5 mL) then dried under vacuum to yield the title compound as a white solid (22 mg).

Provenance & Evidence