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【结 构 式】

【分子编号】65233

【品名】 

【CA登记号】 

【 分 子 式 】C17H19ClN5O4P

【 分 子 量 】423.795622

【元素组成】C 48.18% H 4.52% Cl 8.37% N 16.53% O 15.1% P 7.31%

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:(IX)

Treatment of adenosine (I) with ethylene carbonate (II) in the presence of NaOH in refluxing DMF gives 9-(2-hydroxyethyl)adenosine (III). Diethyl phosphite (IV) is then condensed with formaldehyde, followed by reaction with p-toluenesulfonyl chloride and Et3N to afford diethyl (tosyloxymethyl)phosphonate (V). Subsequent condensation of tosylate (V) with (III) in the presence of t-BuONa gives the phosphonyloxymethoxyethyl adenosine (PMEA) diethyl ester (VI), which is hydrolyzed to the corresponding phosphonic acid adefovir (VII) by means of in situ-generated iodotrimethylsilane. The condensation of phosphonic acid (VII) with 1(S)-(3-chlorophenyl)-1,3-propanediol (VIII) utilizing DCC/pyridine leads to the cyclic phosphonate (IX) as a roughly equimolecular mixture of diastereoisomers, which can be chromatographically separated to furnish the title cis-isomer pradefovir. In an improved procedure, activation of adefovir (VII) with oxalyl chloride and N,N-diethylformamide generates the formamidine-protected phosphonyl dichloridate (X), which upon condensation with diol (VIII) at low temperature gives the cyclic phosphonate (XI) as a mixture in which the desired cis-diastereoisomer predominates. After hydrolysis of the formamidine (XI) with ethanolic AcOH, recrystallization as the corresponding mesylate salt provides the title adefovir prodrug in high diastereomeric excess (1-5). Scheme 1.

1 Kopcho, J.J., Matelich, M.C., Reddy, K.R., Ugarkar, B.G. (Metabasis Therapeutics, Inc.). Process for preparation of cyclic prodrugs of PMEA and PMPA. JP 2005525422, US 2003225277, WO 2003095665.
2 Erion, M.D., Kopcho, J.J., Matelich, M.C., Reddy, K.R. (Metabasis Therapeutics, Inc.). Novel phosphonic acid based prodrugs of PMEA and its analogues. EP 1532157, US 2003229225, WO 2004037161.
3 Reddy, K.R., Matelich, M.C., Ugarkar, B.G. et al. HepDirect prodrugs of adefovir: Design, synthesis and optimization. 227th ACS Natl Meet (March 28-April 1, Anaheim) 2004, Abst MEDI- 27.
4 Martin, K. (Metabasis Therapeutics, Inc.). Lewis acid mediated synthesis of cyclic esters. CA 2565966, EP 1753762, US 2005282782, WO 2005123729.
5 Erion, M.D., Reddy, K.R., Boyer, S.H. et al. Design, synthesis, and characterization of a series of cytochrome P450 3A-activated prodrugs (HepDirect prodrugs) useful for targeting phospho(on)ate-based drugs to the liver. J Am Chem Soc 2004, 126(16): 5154-63.
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) 10343 9H-Purin-6-amine; 9H-Purin-6-ylamine; Adenine 73-24-5 C5H5N5 详情 详情
(II) 32802 1,3-dioxolan-2-one 96-49-1 C3H4O3 详情 详情
(III) 39672 2-(6-amino-9H-purin-9-yl)-1-ethanol C7H9N5O 详情 详情
(IV) 12714 diethyl phosphonate; diethyl phosphite 762-04-9 C4H11O3P 详情 详情
(V) 12702 (diethoxyphosphoryl)methyl 4-methylbenzenesulfonate 31618-90-3 C12H19O6PS 详情 详情
(VI) 39673 diethyl [2-(6-amino-9H-purin-9-yl)ethoxy]methylphosphonate C12H20N5O4P 详情 详情
(VII) 16165 [2-(6-amino-9H-purin-9-yl)ethoxy]methylphosphonic acid C8H12N5O4P 详情 详情
(VIII) 65232 1(S)-(3-chlorophenyl)-1,3-propanediol   C9H11ClO2 详情 详情
(IX) 65233     C17H19ClN5O4P 详情 详情
(X) 65234     C13H19Cl2N6O2P 详情 详情
(XI) 65235     C22H28ClN6O4P 详情 详情
Extended Information