4-Toluenesulfonyl chloride → (11S)-11-methyl-3-[2-(methylsulfonyl)ethyl]-10,11-dihydro-8H-[1,4]oxazino[4',3':1,2]imidazo[4,5-c]quinolin-6-amine

Participants

Reaction Steps

A 200-mL, round-bottomed flask was charged with (11S)-11-methyl-3-[2-(methylsulfonyl)ethyl]-10,11-dihydro-8H-[1,4]oxazino[4′,3′:1,2]imidazo[4,5-c]quinoline (0.45 g, 1.31 mmol) and CH2Cl2 (75 mL). The mixture was stirred at ambient temperature and MCPBA (0.45 g, 50% purity) was then added slowly in portions. The reaction was stirred at ambient temperature for 2 hours. Concentrated aqueous NH4OH solution (25 mL) was then slowly added to the reaction mixture followed by careful addition of p-toluenesulfonyl chloride (0.27 g, 1.44 mmol). The reaction was stirred rapidly at ambient temperature overnight. The reaction was then treated with H2O (100 mL) and vigorous stirring was maintained for 2 hours. The layers were then separated and the aqueous layer was extracted with CH2Cl2 (3×50 mL). The combined organic layers were concentrated under reduced pressure. Chromatography (SiO2, 0-15% CMA/CHCl3) gave a white solid that was crystallized from acetonitrile to give 0.12 g of (11S)-11-methyl-3-[2-(methylsulfonyl)ethyl]-10,11-dihydro-8H-[1,4]oxazino[4′,3′:1,2]imidazo[4,5-c]quinolin-6-amine as a white, crystalline solid, mp 205-206° C.

Provenance & Evidence