N-(2,2-Difluoro-6-nitro-benzo[1,3]dioxol-5-yl)acetamide synthesis
- Product Name:N-(2,2-Difluoro-6-nitro-benzo[1,3]dioxol-5-yl)acetamide
- CAS Number:1736-66-9
- Molecular formula:C9H6F2N2O5
- Molecular Weight:260.15
948-94-7
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Yield:1736-66-9 49%
Reaction Conditions:
with nitric acid;acetic acid at 25 - 60;
Steps:
1.2 Synthesis of N-(2,2-difluoro-6-nitrobenzo[d][l,3]dioxol-5-yl)acetamide
N-(2,2-difluorobenzo[d][l ,3]dioxol-5-yl)acetamide (11.39 g, 52.938 mmol) was dissolved in glacial acetic acid (50.4 ml). To the resulting mixture was added dropwise a mixture of fuming nitric acid (6.1 ml, 3.35 eq.) in glacial acetic acid (20.2 ml, 0.28 eq.). After addition, the reaction mixture was stirred for 22 h at room temperature. The reaction mixture was stirred at 60°C overnight. Subsequently, the reaction mixture was poured into a of ice and water mixture. The resulting precipitate was filtered off by suction filtration. The crude product was then purified by column chromatography on a silica gel flash column (eluent DCM:MeOH 95:5). The product was isolated and concentrated in vacuo to obtain a yellow solid (6.7 g, 49% yield, 100% purity). 1H NMR (DMSO-d6 + CCl4): 2.09 (3H, s, CH3), 7.76 (1H, s, CH-arom.)5 8.15 (1H, s, CH- arom.), 10.33 (1H, s, NH)
References:
WO2014/1464,2014,A1 Location in patent:Page/Page column 46; 47