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【结 构 式】

【药物名称】

【化学名称】Pivalic acid (+)-4(R)-(methylamino)-4,5,6,7-tetrahydro-1,2-benzisoxazol-3-yloxymethyl ester hemioxalate

【CA登记号】182316-77-4, 182316-76-3 (free base), 182317-67-5 (S-isomer), 182317-66-4 (S-isomer;free base)

【 分 子 式 】C16H24N2O8

【 分 子 量 】372.37828

【开发单位】Lundbeck (Originator)

【药理作用】Antiepileptic Drugs, Chemical Delivery Systems, DRUG DELIVERY, Drug Delivery Systems, NEUROLOGIC DRUGS, GABA Reuptake Inhibitors

合成路线1

Alkylation of 4,5,6,7-tetrahydro-1,2-benzisoxazol-3-ol (I) with ethyl bromide in the presence of K2CO3 afforded the ethoxy derivative (II). Subsequent oxidation of (II) with sodium dichromate and H2SO4 provided the desired ketone (III) along with minor amounts of the isomeric 7-oxo compound (IV) that were separated by column chromatography. Conversion of (III) to the corresponding oxime (V), followed by reduction with aluminum amalgam yielded amine (VI). Resolution was achieved via formation of the diastereomeric amides with (R)-alpha-methoxyphenylacetyl chloride (VII) and isolation of the desired isomer (VIII) by preparative HPLC. Cleavage of amide and ether groups of (VIII) by means of HBr furnished (R)-4-amino-3-hydroxy-4,5,6,7-tetrahydro-1,2-benzisoxazole (IX). Protection as the corresponding tert-butyl carbamate, followed by N-methylation with CH3I and NaH provided intermediate (X). An alternative procedure for the preparation of intermediate (X) consisted in the reductive amination of ketone (III) with methylamine and NaBH3CN, followed by condensation of the resulting amine (XI) with the chiral acid chloride (VII) and chromatographic isolation of the desired diastereoisomer (XII). The alpha-methoxyphenylacetyl group of (XII) was then removed by an alternative method consisting in the treatment with lithium triethylborohydride to give the chiral amine (XIII). Cleavage of the ethyl ether group of (XIII) was effected by means of HBr in AcOH, and the resulting compound (XIV) was condensed with di-tert-butyl dicarbonate to produce carbamate (X). Subsequent reaction of (X) with pivaloyloxymethyl iodide (XV) in the presence of potassium tert-butoxide yielded the target O-alkylated compound (XVI) along with some N-alkylated regioisomer. The Boc protecting group of (XVI) was finally removed by treatment with trifluoroacetic acid.

1 Frolund, B.; Falch, E.; Perregaard, J.; et al.; Selective inhibitors of glial GABA uptake: Synthesis, absolute stereochemistry, and pharmacology of the enantiomers of 3-hydroxy-4-amino-4,5,6,7-tetrahydro-1,2-benzisoxazole (exo-THPO) and analogues. J Med Chem 1999, 42, 26, 5402.
2 Falch, E.; Moltzen, L.S.; Schousboe, A.; Frolund, B.; Perregaard, J.K.; Krogsgaard-Larsen, P. (H. Lundbeck A/S); 4-Aminotetrahydrobenzisoxazole or -isothiazole cpds.. WO 9626929 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
11021 Methanamine; Methylamine 74-89-5 CH5N 详情 详情
(I) 37236 4,5,6,7-tetrahydro-1,2-benzisoxazol-3-ol C7H9NO2 详情 详情
(II) 37237 ethyl 4,5,6,7-tetrahydro-1,2-benzisoxazol-3-yl ether; 3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazole C9H13NO2 详情 详情
(III) 37238 3-ethoxy-6,7-dihydro-1,2-benzisoxazol-4(5H)-one C9H11NO3 详情 详情
(IV) 37239 3-ethoxy-5,6-dihydro-1,2-benzisoxazol-7(4H)-one C9H11NO3 详情 详情
(V) 37240 3-ethoxy-6,7-dihydro-1,2-benzisoxazol-4(5H)-one oxime C9H12N2O3 详情 详情
(VI) 37241 3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-amine; 3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-ylamine C9H14N2O2 详情 详情
(VII) 16302 (2R)-2-methoxy-2-phenylethanoyl chloride C9H9ClO2 详情 详情
(VIII) 37242 (2R)-N-[(4R)-3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-yl]-2-methoxy-2-phenylethanamide C18H22N2O4 详情 详情
(IX) 37243 (4R)-4-amino-4,5,6,7-tetrahydro-1,2-benzisoxazol-3-ol C7H10N2O2 详情 详情
(X) 34244 methyl 2-[(1R,2R,3R)-2-[(benzyloxy)methyl]-5-[(Z)-2-methoxy-2-oxoethylidene]-3-[(tetrahydro-2H-pyran-2-yloxy)methyl]cyclopentyl]acetate C25H34O7 详情 详情
(XI) 37245 N-(3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-yl)-N-methylamine; 3-ethoxy-N-methyl-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-amine C10H16N2O2 详情 详情
(XII) 37246 (2R)-N-[(4R)-3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-yl]-2-methoxy-N-methyl-2-phenylethanamide C19H24N2O4 详情 详情
(XIII) 37247 (4R)-3-ethoxy-N-methyl-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-amine; N-[(4R)-3-ethoxy-4,5,6,7-tetrahydro-1,2-benzisoxazol-4-yl]-N-methylamine C10H16N2O2 详情 详情
(XIV) 37248 (4R)-4-(methylamino)-4,5,6,7-tetrahydro-1,2-benzisoxazol-3-ol C8H12N2O2 详情 详情
(XV) 11159 iodomethyl pivalate C6H11IO2 详情 详情
(XVI) 37249 ([(4R)-4-[(tert-butoxycarbonyl)(methyl)amino]-4,5,6,7-tetrahydro-1,2-benzisoxazol-3-yl]oxy)methyl pivalate C19H30N2O6 详情 详情
Extended Information