反应详情

Prepared using General Procedure 19. To a stirred solution of tert-butyl 2-(N-(4-cyanobenzyl)-4-nitrobenzamido)acetate INT-56 (11.5 g, 29.2 mmol) and TEA (10.2 mL, 73.0 mmol) in DMF (50 mL) was added hydroxylamine hydrochloride (5.07 g, 73.0 mmol). After 24 h the reaction mixture was poured onto water (200 mL) and NaHCO3 (200 mL) and extracted into EA (2×250 mL). The organics were washed with brine (3×200 mL), dried over MgSO4 and concentrated in vacuo, evaporating from hexanes, to provide 12.1 g (97%) of tert-butyl 2-(N-(4-(N-hydroxycarbamimidoyl)benzyl)-4-nitrobenzamido)acetate INT-57 as an off-white powder. LCMS-ESI (m/z) calculated for C21H24N4O6: 428; found 429 [M+H]+, tR=1.42 min (Method 10).

1. customPrepared
2. extractionextracted into EA (2×250 mL)
3. washThe organics were washed with brine (3×200 mL)
4. dry with materialdried over MgSO4
5. concentrationconcentrated in vacuo
6. customevaporating from hexanes