1,10-Phenanthroline → 6-benzyloxy-4-(toluene-3-sulfonyl)-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine

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Reaction Conditions

Reaction Steps

To 6-bromo-4-(toluene-3-sulfonyl)-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine (50 mg, 140 mmol) in benzyl alcohol (400 μL) was added CuI (15 mg, 79 mmol), 1,10-phenanthroline (15 mg, 83 mmol), and Cs2CO3 (70 mg, 210 mmol). The resulting mixture was heated to 130° C. for 2 hours. Next, the reaction mixture was cooled to room temperature and quenched with a small amount of water, then extracted with ethyl acetate. The aqueous phase was discarded and the organic phase concentrated under reduced pressure. The resulting residue was purified by HPLC to afford 6-benzyloxy-4-(toluene-3-sulfonyl)-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine. LCMS (ESI): calc. C21H20N2O4S=396; obs. M+H=397.

Provenance & Evidence