Electric Literature of 5013-77-4,Some common heterocyclic compound, 5013-77-4, name is N-Methyl-2,4-dichlorobenzylamine, molecular formula is C8H9Cl2N, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
General procedure: 6.11. 4-Chloro-N-(2,4-dichlorobenzyl)pyrimidin-2-amine (13) and 2-chloro-N-(2,4-dichlorobenzyl)pyrimidin-4-amine (14); 2,4-Dichlorobenzylamine (1.0 mL, 7.4 mmol) was added to a stirring solution of 2,4-dichloropyrimidine (1.0 g, 6.7 mmol) and DIPEA (1.8mL, 10.1mmol) in anhydrous DCE (10mL) and the reaction mixture was stirred at 20C under a nitrogen atmosphere for 24h. LCMS showed the presence of a mixture of regioisomers (System A, RT=1.10min, 63% and 1.25min, 27%). The reaction mixture was diluted with water (50mL) and extracted with DCM (3×50mL). The combined organic extracts were washed with brine (50mL), dried using a hydrophobic frit and evaporated under reduced pressure. The residue was purified by column chromatography on a silica column, using a gradient of 0-100% ethyl acetate-cyclohexane over 40 min. The appropriate fractions were combined and evaporated under reduced pressure to afford the two regioisomers as white solids: less-polar isomer 13 (400 mg, 21%) and the more-polar isomer 14 (950 mg, 49%); 6.23 2-Chloro-N-(2,4-dichlorobenzyl)-N-methylpyrimidin-4-amine (24) Prepared from 12 (0.50 g, 3.4 mmol), N-methyl-(2,4-dichlorobenzyl)amine (0.64 g, 3.4 mmol) and DIPEA (1.3 mL, 7.4 mmol) according to the procedure described for the preparation of 14 to give 24 (0.39 g, 38%) as a white solid: 1H NMR delta (400 MHz, CD3OD) 8.04 (br. s, 1H), 7.52 (d, J = 2.0 Hz, 1H), 7.31 (dd, J = 8.0, 2.0 Hz, 1H), 7.12 (d, J = 8.0 Hz, 1H), 6.66 (br. s, 1H), 4.89 (s, 2H) (obscured by HOCD3), 3.13 (br. s, 3H); LCMS (System A, UV, ES) RT = 1.28 min, [M + H]+ = 302, 304, 306, 100% purity.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route N-Methyl-2,4-dichlorobenzylamine, its application will become more common.
Reference:
Article; Shukla, Lena; Ajram, Laura A.; Begg, Malcolm; Evans, Brian; Graves, Rebecca H.; Hodgson, Simon T.; Lynn, Sean M.; Miah, Afjal H.; Percy, Jonathan M.; Procopiou, Panayiotis A.; Richards, Stephen A.; Slack, Robert J.; European Journal of Medicinal Chemistry; vol. 115; (2016); p. 14 – 25;,
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