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【结 构 式】

【分子编号】33418

【品名】methyl (1R*,2R*,3S*,4S*)-3-[(1S*)-1-(acetamido)-2-ethylbutyl]-4-amino-2-hydroxycyclopentanecarboxylate

【CA登记号】

【 分 子 式 】C15H28N2O4

【 分 子 量 】300.3984

【元素组成】C 59.98% H 9.39% N 9.33% O 21.3%

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)

Ring opening of cis-2-azabicyclo[2.2.1]hept-5-en-3-one (I) with HCl in refluxing methanol gives cis-4-amino-2-cyclopentene-1-carboxylic acid (II), which is esterified with HCl/methanol, yielding the methyl ester (III). The protection of (III) with tert-butoxycarbonyl anhydride and triethylamine in dichloromethane affords carbamate (IV), which is cyclized with 2-ethyl-1-nitrobutane (V) by means of phenyl isocyanate in refluxing benzene to give the cyclopenta-oxazoline (VI). Ring opening of (VI) by hydrogenation with H2 over PtO2 in HCl/methanol yields amine (VII), which is acylated with acetic anhydride and triethylamine in dichloromethane to afford acetamide (VIII). The deprotection of (VIII) with HCl in ethyl ether gives the cyclopentylamine (IX), which is condensed with N,N'-bis(tert-butoxycarbonyl)-O-methylisourea (X) by means of HgCl2 in DMF to yield the protected guanidino compound (XI). Deprotection of the guanidino group of (XI) with trifluoroacetic acid in dichloromethane affords the methyl ester (XII), which is finally hydrolyzed with NaOH in THF/methanol.

1 Sorbera, L.A.; Castañer, J.; Graul, A.; RWJ-270201. Drugs Fut 2000, 25, 3, 249.
2 Montgomery, J.A.; Babu, Y.S.; Chand, P. (BioCryst Pharmaceuticals, Inc.); Substd. cyclopentane and cyclopentene cpds. useful as neuraminidase inhibitors. WO 9933781 .
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) 33410 cis-2-azabicyclo[2.2.1]hept-5-en-3-one C6H7NO 详情 详情
(II) 33411 cis-4-amino-2-cyclopentene-1-carboxylic acid 168471-40-7 C6H9NO2 详情 详情
(III) 33412 methyl cis-4-amino-2-cyclopentene-1-carboxylate C7H11NO2 详情 详情
(IV) 33413 methyl cis-4-[(tert-butoxycarbonyl)amino]-2-cyclopentene-1-carboxylate C12H19NO4 详情 详情
(V) 33414 3-(nitromethyl)pentane C6H13NO2 详情 详情
(VI) 33415 methyl (3aR*,4R*,6S*,6aS*)-4-[(tert-butoxycarbonyl)amino]-3-(1-ethylpropyl)-4,5,6,6a-tetrahydro-3aH-cyclopenta[d]isoxazole-6-carboxylate C18H30N2O5 详情 详情
(VII) 33416 methyl (1R*,2R*,3R*,4S*)-3-[(1S*)-1-amino-2-ethylbutyl]-4-[(tert-butoxycarbonyl)amino]-2-hydroxycyclopentanecarboxylate C18H34N2O5 详情 详情
(VIII) 33417 methyl (1R*,2R*,3R*,4S*)-3-[(1S*)-1-(acetamido)-2-ethylbutyl]-4-[(tert-butoxycarbonyl)amino]-2-hydroxycyclopentanecarboxylate C20H36N2O6 详情 详情
(IX) 33418 methyl (1R*,2R*,3S*,4S*)-3-[(1S*)-1-(acetamido)-2-ethylbutyl]-4-amino-2-hydroxycyclopentanecarboxylate C15H28N2O4 详情 详情
(X) 33419 tert-butyl (E)-[(tert-butoxycarbonyl)amino](methoxy)methylidenecarbamate C12H22N2O5 详情 详情
(XI) 33420 methyl (1R*,2R*,3S*,4S*)-3-[(1S*)-1-(acetamido)-2-ethylbutyl]-4-([[(tert-butoxycarbonyl)amino][(tert-butoxycarbonyl)imino]methyl]amino)-2-hydroxycyclopentanecarboxylate C26H46N4O8 详情 详情
(XII) 33421 methyl (1R*,2R*,3S*,4S*)-3-[(1S*)-1-(acetamido)-2-ethylbutyl]-4-[[amino(imino)methyl]amino]-2-hydroxycyclopentanecarboxylate C16H30N4O4 详情 详情
Extended Information