Diisopropylethylamine → 3-chloro-6-((2R,6R)-2,6-dimethylmorpholino)-7-fluorobenzo[d]isoxazole-5-carbaldehyde

Participants

Reaction Steps

A solution of 3-chloro-6,7-difluorobenzo[d]isoxazole-5-carbaldehyde (Intermediate 532, 3.32 g, 10.6 mmol), (2R,6R)-2,6-dimethylmorpholine (Purchased from BASF®, 2.64 g, 22.9 mmol) and DIEA (4 ml, 22.9 mmol) in acetonitrile (20 ml) was heated at reflux for 3 hours. The mixture was cooled to room temperature before being partitioned between EtOAc and 1N HCl. The EtOAc was separated and washed with brine. The combined aqueous layers were extracted with EtOAc, which was washed with brine. The combined EtOAc was dried (MgSO4) and concentrated to give an oil that was chromatographed on silica gel (50% hexanes in CH2Cl2 followed by gradient elution to 100% CH2Cl2 followed by gradient elution to 5% EtOAc in CH2Cl2) to give 2 materials in order of elution: the first material (265 mg) is consistent with starting material and the second (3.33 g) with desired product.

Provenance & Evidence