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【结 构 式】

【药物名称】

【化学名称】cis-8-(3-Amino-4-methylpiperidinyl)-1-cyclopropyl-7-fluoro-9-methyl-4-oxo-4H-quinolizine-3-carboxylic acid

【CA登记号】186198-72-1 (non-specific stereoch.)

【 分 子 式 】C20H24FN3O3

【 分 子 量 】373.43098

【开发单位】Abbott (Originator)

【药理作用】Antibacterial Drugs, ANTIINFECTIVE THERAPY, Quinolizinones

合成路线1

Treatment of a commercial mixture of 4-chloro-tetrafluropyridine (I) and 3-chlorotetrafluoropyridine (II) with sodium tert-butoxide, followed by chromatographic separation, afforded 4-tert-butoxy-3-chloro-2,5,6-trifluoropyridine (III). Subsequent hydrogenolysis of the chlorine atom of (III) provided (IV), which was methylated with iodomethane in the presence of LDA yielding methylpyridine (V). Selective removal of the 6-fluorine of (V) to give (VI) was achieved by treatment with hydrazine hydrate in boiling n-propanol, followed by air oxidation of the intermediate pyridyl hydrazine. Alkylation of cyclopropaneacetonitrile (VII) with (VI) furnished the pyridinyl cyclopropaneacetonitrile (VIII). After acid cleavage of the tert-butyl group of (VIII), treatment with phosphoryl chloride in DMF gave rise to 4-chloropyridine derivative (IX). Then, alcoholysis of the cyano group of (IX) produced ethyl ester (X). Ester reduction by means of LiAlH4 and subsequent Swern oxidation of the resulting alcohol (XI) provided aldehyde (XII). The required quinolizinone system (XIII) was prepared by Knoevenagel condensation of pyridine aldehyde (XII) with diethyl malonate (1). The chiral piperidine (XV) was obtained by chiral HPLC resolution of racemic cis-N-carbobenzoxy-3-(tert-butoxycarbonylamino)-4-methylpiperidine (XIV), followed by hydrogenolytic cleavage of the carbobenzoxy group. Aromatic substitution of chloroquinolizinone (XIII) with piperidine (XV) yielded adduct (XVI). Hydrolysis of the ethyl ester of (XVI) with LiOH and further acid deprotection of the Boc group furnished the title compound.

1 Wang, S.; Ma, Z.; Flamm, R.K.; Cooper, C.S.; Li, Q.; Nilius, J.D.; Chu, D.T.W.; Sun OR, Y.; Meulbroek, J.A.; Shen, L.L.; Fung, A.K.L.; Synthesis and antimicrobial activity of 4H-4-oxoquinolizine derivatives: Consequences of structural modification at the C-8 position. J Med Chem 1999, 42, 20, 4202.
2 Chu, D.T.; Li, Q.; Cooper, C.S.; Fung, A.K.L.; Lee, C.M.; Plattner, J.J.; Ma, Z.; Wang, W.-B. (Abbott Laboratories Inc.); Quinolizinone type cpds.. EP 0871628; JP 1999510478; WO 9639407 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(A) 16829 Diethyl malonate 105-53-3 C7H12O4 详情 详情
(I) 40621 4-chloro-2,3,5,6-tetrafluoropyridine C5ClF4N 详情 详情
(II) 16819 3-chloro-2,4,5,6-tetrafluoropyridine; Pyridine, 3-chloro-2,4,5,6-tetrafluoro- 1735-84-8 C5ClF4N 详情 详情
(III) 16820 4-(tert-butoxy)-3-chloro-2,5,6-trifluoropyridine; tert-butyl 3-chloro-2,5,6-trifluoro-4-pyridinyl ether C9H9ClF3NO 详情 详情
(IV) 16821 4-(tert-butoxy)-2,3,6-trifluoropyridine; tert-butyl 2,3,6-trifluoro-4-pyridinyl ether C9H10F3NO 详情 详情
(V) 16822 tert-butyl 2,3,6-trifluoro-5-methyl-4-pyridinyl ether; 4-(tert-butoxy)-2,3,6-trifluoro-5-methylpyridine C10H12F3NO 详情 详情
(VI) 16823 tert-butyl 2,5-difluoro-3-methyl-4-pyridinyl ether; 4-(tert-butoxy)-2,5-difluoro-3-methylpyridine C10H13F2NO 详情 详情
(VII) 16824 2-cyclopropylacetonitrile; Cyclopropylacetonitrile 6542-60-5 C5H7N 详情 详情
(VIII) 16825 2-[4-(tert-butoxy)-5-fluoro-3-methyl-2-pyridinyl]-2-cyclopropylacetonitrile C15H19FN2O 详情 详情
(IX) 16826 2-(4-chloro-5-fluoro-3-methyl-2-pyridinyl)-2-cyclopropylacetonitrile C11H10ClFN2 详情 详情
(X) 16827 ethyl 2-(4-chloro-5-fluoro-3-methyl-2-pyridinyl)-2-cyclopropylacetate C13H15ClFNO2 详情 详情
(XI) 31627 2-(4-chloro-5-fluoro-3-methyl-2-pyridinyl)-2-cyclopropyl-1-ethanol C11H13ClFNO 详情 详情
(XII) 16828 2-(4-chloro-5-fluoro-3-methyl-2-pyridinyl)-2-cyclopropylacetaldehyde C11H11ClFNO 详情 详情
(XIII) 16831 ethyl 8-chloro-1-cyclopropyl-7-fluoro-9-methyl-4-oxo-4H-quinolizine-3-carboxylate C16H15ClFNO3 详情 详情
(XIV) 40623 benzyl (3S,4S)-3-[(tert-butoxycarbonyl)amino]-4-methyl-1-piperidinecarboxylate C19H28N2O4 详情 详情
(XV) 40622 tert-butyl (3S,4S)-4-methylpiperidinylcarbamate C11H22N2O2 详情 详情
(XVI) 40624 ethyl 8-[(3S,4S)-3-[(tert-butoxycarbonyl)amino]-4-methylpiperidinyl]-1-cyclopropyl-7-fluoro-9-methyl-4-oxo-4H-quinolizine-3-carboxylate C27H36FN3O5 详情 详情
Extended Information