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CAS No. : | 517920-69-3 | MDL No. : | MFCD03094270 |
Formula : | C6H6BrFN2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | OZKZRRLKJAXHQA-UHFFFAOYSA-N |
M.W : | 205.03 | Pubchem ID : | 2773279 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P280-P305+P351+P338-P310 | UN#: | |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
5-Bromo-3-fluoro-benzene-l,2-diamine (1.07 g, 5.2 mmol), ie/ -butyl 4-(2- bromoacetyl)piperidine-l-carboxylate (1.60 g, 5.2 mmol), and DMF (80 mL) were combined and stirred at room temperature for 16 h, 50 °C for 24 h, and 70 °C for 24 h. After cooling to room temperature, potassium carbonate (1.08 g, 7.84 mmol) and di-ie/ -butyl dicarbonate (1.4 mL, 6.3 mmol) were added. The reaction mixture was stirred at room temperature for 2 h. The mixture was partitioned between EtOAc and brine. The organic layer was washed twice with brine, dried over Na2S04, filtered and concentrated. The residue was chromatographed on silica gel, eluting with 0-100percent EtOAc in hexanes to yield ieri-butyl 4-(6-bromo-8-fluoro-quinoxalin-2- yl)piperidine-l-carboxylate and ie/ -butyl 4-(7-bromo-5-fluoroquinoxalin-2-yl)piperidine-l- carboxylate as an approximate 1 : 1 mixture (labeled distinguishable peaks as compounds A and B in 1H NMR; labeled overlapping peaks as apparent peaks "apt") (1.23 g, 58percent). MS m/z 310.2 [M+H-C02-i-Bu]+; 1H NMR (CDC13) delta: 8.84 (s, 1H, A), 8.82 (s, 1H, B), 8.12 (t, 7 = 1.7 Hz, 1H, A), 8.09 (t, 7 = 1.7 Hz, 1H, B), 7.61 (dd, 7 = 9.2, 2.1 Hz, 1H, A), 7.58 (dd, 7 = 9.0, 2.0 Hz, 1H, B), 4.34 (apt d, 7 = 12.2 Hz, 4H), 3.17 (apt qt, 7 = 11.9, 3.7 Hz, 2H), 2.94 (apt br tt, 7 = 13.1, 2.8 Hz, 4H), 1.99 - 2.06 (m, 4H), 1.93 (apt quint 7 = 11.6, 4.0 Hz, 4H), 1.51 (apt d, 7 = 1.8 Hz, 18H). |