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【结 构 式】

【分子编号】21292

【品名】methyl 5-[(3aR,4R,5R,6aS)-5-hydroxy-4-[(E)-4-methyl-3-oxo-1-octenyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate

【CA登记号】

【 分 子 式 】C23H33NO5

【 分 子 量 】403.51876

【元素组成】C 68.46% H 8.24% N 3.47% O 19.82%

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)

A new synthesis of nileprost has been described: The condensation of the protected lactone (I) with acetonitrile by means of lithium dimethylamide (LDA) gives the cyanomethylene derivative (II), which is condensed with methyl 4-oxobutyrate (III) by means of the same reagent yielding compound (IV). The partial reduction of (IV) with H2 over Pd/C in toluene affords compound (V) with part of the nileprost skeleton. Partial deprotection of (V) with tetrabutylammonium fluoride gives the alcohol (VI), which is oxidized with SO3-pyridine complex to the aldehyde (VII). The Wittig condensation of (VII) with diethyl (2-oxo-3-methylheptyl)phosphonate (VIII) by means of NaH in THF yields the enone (IX), which is deprotected with acetic acid and reduced with diisobutylaluminum hydride in toluene to afford the nileprost methyl ester (X). Finally, this compound is hydrolyzed with NaOH in methanol-water.

1 Takahashi, A.; Kirio, Y.; Sodeoka, M.; Sasai, H.; Shibasaki, M.; Highly stereoselective synthesis of exocyclic tetrasubstituted enol ethers and olefins. A synthesis of nileprost. J Am Chem Soc 1989, 111, 2, 643.
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) 21284 (3aR,4S,5R,6aS)-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]hexahydro-2H-cyclopenta[b]furan-2-one C20H36O5Si 详情 详情
(II) 21285 2-[(3aR,4S,5R,6aS)-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]acetonitrile C22H37NO4Si 详情 详情
(III) 21286 methyl 4-oxobutanoate C5H8O3 详情 详情
(IV) 21287 methyl (E)-5-[(3aS,4S,5R,6aS)-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]-4,5,6,6a-tetrahydro-3aH-cyclopenta[b]furan-2-yl]-5-cyano-4-pentenoate C27H43NO6Si 详情 详情
(V) 21288 methyl 5-[(3aR,4S,5R,6aS)-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate C27H45NO6Si 详情 详情
(VI) 21289 methyl 5-[(3aR,4S,5R,6aS)-4-(hydroxymethyl)-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate C21H31NO6 详情 详情
(VII) 21290 methyl 5-[(3aR,4S,5R,6aS)-4-formyl-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate C21H29NO6 详情 详情
(VIII) 21291 diethyl 3-methyl-2-oxoheptylphosphonate C12H25O4P 详情 详情
(IX) 21292 methyl 5-[(3aR,4R,5R,6aS)-5-hydroxy-4-[(E)-4-methyl-3-oxo-1-octenyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate C23H33NO5 详情 详情
(X) 21293 methyl 5-[(3aR,4R,5R,6aS)-5-hydroxy-4-[(E,3S)-3-hydroxy-4-methyl-1-octenyl]hexahydro-2H-cyclopenta[b]furan-2-ylidene]-5-cyanopentanoate C23H35NO5 详情 详情
Extended Information