4-Methylmorpholine → Methyl (1aRS,7bSR)-5-(2-{[((S)-1-ethylpyrrolidine-3-carbonyl)amino]methyl}-4-fluoro-benzenesulfonylamino)-1,1a,2,7b-tetrahydrocyclopropa[c]chromene-4-carboxylate

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Reaction Steps

HATU (0.234 g) was added to a mixture of (S)-1-ethylpyrrolidine-3-carboxylic acid (Intermediate 189, 0.089 g) and NMM (0.068 mL) in DMF (4 mL) and the mixture was stirred for 15 minutes. Methyl (1aRS,7bSR)-5-(2-aminomethyl-4-fluorobenzenesulfonylamino)-1,1a,2,7b-tetrahydrocyclopropa[c]chromene-4-carboxylate (Intermediate 102, 0.250 g) was added and the mixture was stirred for 20 hours. The mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with saturated NaHCO3 solution, dried (Na2SO4) and filtered. The filtrate was evaporated to dryness and the residue was purified by chromatography on silica eluting with a mixture of 2M ammonia in methanol and DCM with a gradient of 0-15% to give methyl (1aRS,7bSR)-5-(2-{[((S)-1-ethylpyrrolidine-3-carbonyl)amino]methyl}-4-fluoro-benzenesulfonylamino)-1,1a,2,7b-tetrahydrocyclopropa[c]chromene-4-carboxylate (0.190 g) as a solid.

Provenance & Evidence