反应详情

To a solution of [5-(2-benzyloxy-ethoxy)-2-nitro-phenyl]-carbamic acid methyl ester (2.03 g, 5.86 mmol) in anhydrous dimethylformamide (20 ml) was added iodomethane (1.82 ml, 29.3 mmol), followed by portion wise addition of NaH (0.35 g, 60%, 8.79 mmol). The reaction was stirred under nitrogen for 2 h. The reaction was quenched with NH4Cl (sat) (10 ml) and brine (10 ml), and the aqueous layer was extracted with ether (3×30 ml). The combined organics were dried over MgSO4, filtered and evaporated. The residue was chromatographed on silica gel eluting with hexanes, then 30% ethyl acetate/hexanes to give [5-(2-benzyloxy-ethoxy)-2-nitro-phenyl]-methyl-carbamic acid methyl ester (0.93 g, 89%) as an oil. Analysis calculated for C18H20N2O6 : C, 59.99; H, 5.59; N, 7.77. Found: C, 59.30; H, 5.34; N, 7.62.

1. customThe reaction was quenched with NH4Cl (sat) (10 ml) and brine (10 ml)
2. extractionthe aqueous layer was extracted with ether (3×30 ml)
3. dry with materialThe combined organics were dried over MgSO4
4. filtrationfiltered
5. customevaporated
6. customThe residue was chromatographed on silica gel eluting with hexanes