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【结 构 式】

【分子编号】42327

【品名】ethyl 4-(benzyloxy)-7-hydroxy-8-methyl-2-oxo-2H-chromene-3-carboxylate

【CA登记号】

【 分 子 式 】C20H18O6

【 分 子 量 】354.35932

【元素组成】C 67.79% H 5.12% O 27.09%

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:(V)

Treatment of protected derivative (I) with ethyl chloroformate (II) and DMAP in dichloromethane yields (III), which is then protected by Mitsunobu reaction with benzyl alcohol (IV) in the presence of PPh3 and DEAD to provide (V). Coumarin (V) undergoes Mitsunobu reaction with noviose (VI) to afford alpha-glycoside (VII), which is converted into (VIII) by protection in 3'-OH by means of TESCl, imidazole and DIEA in dichloromethane (chromatographic separation of 3'- and 2'-TES-protected regioisomers is needed), followed by protection of the 2'-OH by treatment with DHP and catalytic TsOH in dichloromethane. Hydrogenolysis of (VIII) over Pd/C followed by desilylation with TBAF in THF affords intermediate (IX), which is then converted into N'-alkoxycarbamate (XII) by reaction with (X) and DMAP in dichloromethane to yield the corresponding p-nitrophenylcarbonate activated form, followed by reaction with hydroxylamine (XI) in DMF and catalysis of DMAP. Exchange of the 3-ester group in (XII) by hydroxylamine (XIII) in pyridine gives coumarin-3-hydroxamate derivative (XIV), which is finally deprotected of its THP form in MeOH and catalysis of TsOH.

1 Haesslein, J.-L.; Dupuis-Hamelin, C.; Periers, A.-M.; Ferroud, D.; Laurin, P.; Bonnefoy, A.; Lassaigne, P.; Misicki, B.; Klich, M.; Mauvais, P.; Coumarin inhibitors of gyrase B with N-propargyloxy-carbamate as an effective pyrrole bioisostere. Bioorg Med Chem Lett 2000, 10, 2, 161.
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) 42325 4-hydroxy-8-methyl-7-(tetrahydro-2H-pyran-2-yloxy)-2H-chromen-2-one C15H16O5 详情 详情
(II) 11229 1-[(Chlorocarbonyl)oxy]ethane;ethyl carbonochloridate; Carbonchloridic acid ethyl ester;Ethyl chloroformate;Ethyl chlorocarbonate 541-41-3 C3H5ClO2 详情 详情
(III) 42326 ethyl 4-hydroxy-8-methyl-2-oxo-7-(tetrahydro-2H-pyran-2-yloxy)-2H-chromene-3-carboxylate C18H20O7 详情 详情
(IV) 18710 Benzyl alcohol; Phenylmethanol 100-51-6 C7H8O 详情 详情
(V) 42327 ethyl 4-(benzyloxy)-7-hydroxy-8-methyl-2-oxo-2H-chromene-3-carboxylate C20H18O6 详情 详情
(VI) 40547 (3R,4S,5R)-5-methoxy-6,6-dimethyltetrahydro-2H-pyran-2,3,4-triol C8H16O5 详情 详情
(VII) 42328 ethyl 4-(benzyloxy)-7-[[(2R,3R,4S,5R)-3,4-dihydroxy-5-methoxy-6,6-dimethyltetrahydro-2H-pyran-2-yl]oxy]-2-oxo-2H-chromene-3-carboxylate C27H30O10 详情 详情
(VIII) 42329 ethyl 4-(benzyloxy)-7-([(2R,3R,4R,5R)-5-methoxy-6,6-dimethyl-3-(tetrahydro-2H-pyran-2-yloxy)-4-[(triethylsilyl)oxy]tetrahydro-2H-pyran-2-yl]oxy)-2-oxo-2H-chromene-3-carboxylate C38H52O11Si 详情 详情
(IX) 42330 ethyl 4-hydroxy-7-[[(2R,3R,4R,5R)-4-hydroxy-5-methoxy-6,6-dimethyl-3-(tetrahydro-2H-pyran-2-yloxy)tetrahydro-2H-pyran-2-yl]oxy]-2-oxo-2H-chromene-3-carboxylate C25H32O11 详情 详情
(X) 16605 4-Nitrophenyl chloroformate; 1-[(Chlorocarbonyl)oxy]-4-nitrobenzene 7693-46-1 C7H4ClNO4 详情 详情
(XI) 38197 O-(2-propynyl)hydroxylamine; 3-(aminooxy)-1-propyne C3H5NO 详情 详情
(XII) 42331 ethyl 4-hydroxy-7-[[(2R,3R,4R,5R)-5-methoxy-6,6-dimethyl-4-([[(2-propynyloxy)amino]carbonyl]oxy)-3-(tetrahydro-2H-pyran-2-yloxy)tetrahydro-2H-pyran-2-yl]oxy]-2-oxo-2H-chromene-3-carboxylate C29H35NO13 详情 详情
(XIII) 42332 1-(aminooxy)-3-methyl-2-butene; O-(3-methyl-2-butenyl)hydroxylamine C5H11NO 详情 详情
(XIV) 42333 (3R,4R,5R,6R)-6-[[4-hydroxy-3-([[(3-methyl-2-butenyl)oxy]amino]carbonyl)-2-oxo-2H-chromen-7-yl]oxy]-3-methoxy-2,2-dimethyl-5-(tetrahydro-2H-pyran-2-yloxy)tetrahydro-2H-pyran-4-yl 2-propynyloxycarbamate C32H40N2O13 详情 详情
Extended Information