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【结 构 式】

【分子编号】18332

【品名】benzyl 2-[3,5-dichloro-2-methyl-6-oxo-1(6H)-pyrazinyl]acetate

【CA登记号】

【 分 子 式 】C14H12Cl2N2O3

【 分 子 量 】327.16636

【元素组成】C 51.4% H 3.7% Cl 21.67% N 8.56% O 14.67%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(IV)

Condensation of glycine benzyl ester (I) and acetaldehyde (II) in the presence of trimethylsilyl cyanide produced the aminonitrile (III), which was isolated as the hydrochloride salt. Further reaction of (III) with oxalyl chloride in o-dichlorobenzene at 100 C afforded the pyrazinone (IV). Subsequent, displacement of the 3-chloro group of (IV) by phenethylamine (V) in refluxing EtOAc gave the aminopyrazinone (VI). The benzyl ester group of (VI) was then hydrolyzed with LiOH in a mixture of H2O/MeOH/THF to yield acid (VII). Dechlorination of (VIII) by Raney-Ni alloy in the presence of NaOH provided pyrazinone (VIII). Reaction of 6-amino-3-bromo-2-methylpyridine (IX) with CuCN in boiling DMF gave nitrile (X), which was reduced to the primary amine (XI) by catalytic hydrogenation over Pd/C. Finally, acid (VIII) was coupled with amine (XI) using EDC and HOBt to furnish the corresponding amide, which was converted to the dihydrochloride salt.

1 Efficacious, orally bioavailable thrombin inhibitors based on 3-aminopyridinone or 3-aminopyrazinone acetamide peptidomimetic templates. J Med Chem 1998, 41, 23, 4466.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(III) 18331 benzyl 2-[(1-cyanoethyl)amino]acetate C12H14N2O2 详情 详情
(IV) 18332 benzyl 2-[3,5-dichloro-2-methyl-6-oxo-1(6H)-pyrazinyl]acetate C14H12Cl2N2O3 详情 详情
(V) 18333 Phenethylamine; 2-Phenyl-1-ethanamine 64-04-0 C8H11N 详情 详情
(VI) 18334 benzyl 2-[3-chloro-2-methyl-6-oxo-5-(phenethylamino)-1(6H)-pyrazinyl]acetate C22H22ClN3O3 详情 详情
(VII) 18335 2-[3-chloro-2-methyl-6-oxo-5-(phenethylamino)-1(6H)-pyrazinyl]acetic acid C15H16ClN3O3 详情 详情
(VIII) 18336 2-[6-methyl-2-oxo-3-(phenethylamino)-1(2H)-pyrazinyl]acetic acid C15H17N3O3 详情 详情
(IX) 18337 5-bromo-6-methyl-2-pyridinamine; 5-bromo-6-methyl-2-pyridinylamine; 6-AMINO-3-BROMO-2-METHYLPYRIDINE 42753-71-9 C6H7BrN2 详情 详情
(X) 18338 6-amino-2-methylnicotinonitrile C7H7N3 详情 详情
(XI) 18339 5-(aminomethyl)-6-methyl-2-pyridinamine; 5-(aminomethyl)-6-methyl-2-pyridinylamine C7H11N3 详情 详情
Extended Information