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【结 构 式】

【分子编号】14451

【品名】[(7R,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methylamine; [(7R,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methanamine

【CA登记号】

【 分 子 式 】C13H21N5

【 分 子 量 】247.34344

【元素组成】C 63.13% H 8.56% N 28.31%

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:(XIII)

The esterification of pyridine-2,5-dicarboxylic acid (I) with thionyl chloride/methanol gives the corresponding dimethyl ester (II), which is hydrogenated with H2 over PtO2 in acetic acid yielding piperidine-2,5-dicarboxylic acid dimethyl ester (III), as a mixture of the cis- and trans-isomers. The condensation of (III) with 2-chloroacetonitrile (IV) by means of Na2CO3 in refluxing isobutyl methyl ketone affords the expected 1-(cyanomethyl) derivative (V), which is cyclized by hydrogenation with H2 over RaNi in methanol/ethyl acetate giving racemic cis-1-oxo-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine-7-carboxylic acid methyl ester (VI). The reduction of (VI) with LiAlH4 in refluxing THF yields the corresponding hydroxymethyl derivative (VII), which is condensed with 2-chloropyrimidine by means of Na2CO3 in refluxing water affording racemic cis-7-(hydroxymethyl)-2-(2-pyrimidinyl)-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine (IX). The reaction of (IX) with methanesulfonyl chloride and triethylamine gives the expected mesylate (X), which is treated with sodium azide in DMF to afford the corresponding azido derivative (XI). The reaction of (XI) with hydrazine in refluxing ethanol gives the racemic cis-7-(aminomethyl)-2-(2-pyrimidinyl)-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine (XII), which is submitted to optical resolution by formation of the corresponding salt with (-)-mandelic acid, separation of the diastereomers by crystallization, and decomposition of the desired salt with NaOH to yield (7R,9aS)-7-(aminomethyl)-2-(2-pyrimidinyl)-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine (XIII). Finally, this compound is condensed with succinic anhydride (XIV) in refluxing xylene.

1 Castaner, J.; Graul, J.; Silvestre, J.S.; Sunepitron Hydrochloride. Drugs Fut 1998, 23, 2, 161.
2 Desai, K.A.; Bright, G.M. (Pfizer Inc.); Bis-aza-bicyclic anxiolytic agents and antidepressants. EP 0380217; JP 1990233681; US 5122525; WO 9008144; WO 9008148 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 14440 2,5-pyridinedicarboxylic acid 100-26-5 C7H5NO4 详情 详情
(II) 14441 dimethyl 2,5-pyridinedicarboxylate 881-86-7 C9H9NO4 详情 详情
(III) 14442 dimethyl 2,5-piperidinedicarboxylate C9H15NO4 详情 详情
(IV) 14443 2-chloroacetonitrile; chloroacetonitrile 107-14-2 C2H2ClN 详情 详情
(V) 14444 dimethyl 1-(cyanomethyl)-2,5-piperidinedicarboxylate C11H16N2O4 详情 详情
(VI) 14445 methyl (7S,9aS)-1-oxooctahydro-2H-pyrido[1,2-a]pyrazine-7-carboxylate C10H16N2O3 详情 详情
(VII) 14446 (7S,9aS)octahydro-2H-pyrido[1,2-a]pyrazin-7-ylmethanol C9H18N2O 详情 详情
(VIII) 11191 2-Chloropyrimidine 1722-12-9 C4H3ClN2 详情 详情
(IX) 14448 [(7S,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methanol C13H20N4O 详情 详情
(X) 14449 [(7S,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methyl methanesulfonate C14H22N4O3S 详情 详情
(XI) 14450 [(7S,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methyl azide; (7S,9aS)-7-(azidomethyl)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazine C13H19N7 详情 详情
(XII) 63830 [(7S,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methylamine; [(7S,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methanamine C13H21N5 详情 详情
(XIII) 14451 [(7R,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methylamine; [(7R,9aS)-2-(2-pyrimidinyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]methanamine C13H21N5 详情 详情
(XIV) 11291 Dihydro-2,5-furandione; Succinic anhydride 108-30-5 C4H4O3 详情 详情
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