Selective Kinase Inhibitors
a kinase inhibitor and selective technology, applied in the field of selective kinase inhibitors, can solve the problems of difficult design of compounds with acceptable selectivity, inhibiting other members of the family with detrimental long-term consequences, etc., and achieve the effect of suppressing the immune system of a subj
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Examples
example 1
6-Chloro-N-[(1R)-1-phenylethyl]pyrazin-2-amine
[0135]
[0136]A solution of R-α-methylbenzylamine (0.57 g, 4.7 mmol) and 2,6-dichloropyrazine (0.6388 g, 4.29 mmol) in dioxane (2.5 mL) was heated at reflux under N2 for 48 hours. The solvent was removed and the product crystallised from toluene-hexane (0.82 g, 82%).
[0137]1H-n.m.r. (CDCl3) δ 1.58 (d, J=6.6 HZ, 3H, CH3), 4.88 (m, 1H, CH), 5.07 (d, 1H, NH), 7.24-7.36 (m, 5H, Ar-H), 7.61 (s, 1H, pyraz-H), 7.79 (s, 1H, pyraz-H).
example 2
N-(tert-butyl)-6-chloropyrazin-2-amine
[0138]
[0139]A mixture of tert-butylamine (14.9 g, 20 mmol), 2,6-dichloropyrazine (6.0 g, 40 mmol), Hünig's base (10 mL) and ethoxyethanol (6 mL) was heated at 130° C. in a sealed tube for 18 hours. The solvent was removed in vacuo and the residue taken up in CHzCl2 (100 mL) and filtered. The filtrate was washed with H2O (2×20 mL), brine (20 mL) and dried (Na2SO4). Chromatography eluting with CH2Cl2 separated the product as a white solid (5.4 g, 72%).
[0140]1H-n.m.r. (CDCl3) δ 1.44 (s, 9H, CH3), 4.68 (br s, 1H, NH), 7.71 (s, 1H, pyraz-H), 7.72 (s, 1H, pyraz-H).
example 3
6-Chloro-N-[(1R)-1-(3-methoxyphenyl)ethyl]pyrazin-2-amine
[0141]
[0142]In a procedure analogous to Example 1, reaction of R-α-methylbenzylamine (1.0 g, 6.6 mmol) and 2,6-dichloropyrazine (0.440 g, 2.95 mmol) furnished the product (517 mg, 67%).
[0143]1H-n.m.r. (CDCl3) δ 1.59 (d, J=6.9 Hz, 3H, CH3), 3.81 (s, 3H, OCH3), 4.87 (m, 1H, CH), 5.47 (br s, 1H, NH), 6.79-7.30 (m, 4H, Ar-H), 7.66 (s, 1H, pyraz-H), 7.79 (s, 1H, pyraz-H).
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