Morpholine → HCID 67394150, compound

Participants

Reaction Steps

980 mg (2.1 mmol; 1.1 eq.) of bromo-tris-pyrrolidino-phosphonium hexafluorophosphate (PyBroP) is added to 500 mg (1.97 mmol) of 5-methoxy-4-nitro-1,3-benzothiazole-2-carboxylic acid and 344 μl (1.97 mmol; 1 eq.) of diisopropylethylamine in solution in 40 ml of dichloromethane. The reaction mixture is maintained for 15 minutes under stirring at ambient temperature, then 202 μl (2.3 mmol; 1.2 eq.) of morpholine and a spatula tip's worth of dimethylaminopyridine are added to the medium which is maintained under stirring for 18 hours at ambient temperature. An insoluble part is then filtered and the solvent evaporated off under reduced pressure. The residue is then purified on a silica column (eluent: ethyl acetate/heptane: gradient of 30 to 70% over 40 minutes then for 5 minutes at 70% of ethyl acetate in heptane) and 210 mg (yield=33%) of expected product is obtained in the form of beige powder.

Provenance & Evidence