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

Participants

Reaction Steps

(11S)-11-[(benzyloxy)methyl]-10,11-dihydro-8H-[1,4]oxazino[4′,3′:1,2]imidazo[4,5-c]quinoline 5-oxide (0.96 g, 2.67 mmol) was dissolved in 25 mL of CH2Cl2 and treated with 2.5 mL of concentrated aqueous NH4OH solution. The mixture was stirred rapidly and then p-toluenesulfonyl chloride (0.51 g, 2.67 mmol) was carefully added. Rapid stirring was continued for 2.5 hours. The reaction mixture was then treated with 50 mL of CH2Cl2 and 25 mL of H2O. The layers were separated and the organic portion was washed successively with 5% Na2CO3 solution (3×25 mL), H2O and brine. The organic portion was dried over Na2SO4, filtered and concentrated under reduced pressure. Chromatography (SiO2, 15-25% CMA/CHCl3) gave a light-brown foam. Crystallization from ethyl acetate and a small amount of methanol gave (11S)-11-[(benzyloxy)methyl]-10,11-dihydro-8H-[1,4]oxazino[4′,3′:1,2]imidazo[4,5-c]quinolin-6-amine (420 mg) fine white needles, mp 184.6-186.2° C.

Provenance & Evidence