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【结 构 式】

【分子编号】69066

【品名】2-benzyl-4-vinylisoindoline

【CA登记号】 

【 分 子 式 】C17H17N

【 分 子 量 】235.32872

【元素组成】C 86.77% H 7.28% N 5.95%

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:(XIII)

Benzylic bromination of 3-bromo-o-xylene (IX) with NBS in the presence of benzoyl peroxide in refluxing CCl4 or chlorobenzene at 80 °C gives 1-bromo-2,3-bis(bromomethyl)benzene (X), which then cyclizes with benzylamine in the presence of KHCO3 in acetonitrile to yield 2-benzyl-4-bromoisoindoline (XI). Alkenylation of compound (XI) with tributyl(vinyl)tin (XII) by means of Pd(PPh3)4 in toluene provides the isoindoline (XIII), which is then deprotected by means of 1-chloroethyl chloroformate (ACE-Cl) in refluxing 1,2-dichloroethane to afford 4-vinylisoindoline (XIV). Finally, coupling of 4-vinylisoindoline (XIV) with N-Boc-trans-4-hydroxyproline methyl ester (XV), previously activated with CDI, in DMF at 60 °C results in carbamate (XVI) .
Alternatively, debenzylation of 2-benzyl-4-bromoisoindoline (XI) by means of ACE-Cl in chlorobenzene at 90 °C, followed by condensation of the deprotected isoindoline (XVII) with N-Boc-trans-4-hydroxyproline methyl ester (XV), previously treated with CDI, by means of DIEA in DMF at 50 °C furnishes carbamate (XVIII). Then, alkenylation of the aryl bromide (XVIII) with potassium vinyltrifluoroborate (XIX) and Et3N in refluxing EtOH affords the vinyl isoindoline derivative (XVI) .
Finally, Boc-deprotection of proline derivative (XVI) by means of HCl in dioxane gives the corresponding amine (XX), which is then coupled with the L-tert-leucine carbamate derivative (XXI) in the presence of EDC, DIEA and HOAt or HOBt in DMF to yield the building block diene (I) .
The L-tert-leucine carbamate (XXI) is prepared by alkylation of ethyl isobutyrate (XXII) with 4-bromo-1-butene (XXIII) and LDA in HMPA, followed by ester group reduction with LiAlH4 in Et2O, affording 2,2-dimethyl-5-hexen-1-ol (XXIV) . After treatment of hexenol (XXIV) with triphosgene by means of DIEA and NaOH in 1,4-dioxane, the resulting chloroformate is condensed with L-tert-leucine (XXV) to give carbamate (XXI) .

1 Holloway, M.K., Liverton, N.J., Ludmerer, S.W. et al. (Merck & Co., Inc.). HCV NS3 protease inhibitors. EP 1910404, EP 924593, JP 2009502793, US 2007027071, WO 2007015787, WO 2007015855.
2 McCauley, J.A., McIntyre, C.J., Rudd, M.T. et al. Discovery of vaniprevir (MK-7009), a macrocyclic hepatitis C virus NS3/4a protease inhibitor. J Med Chem 2010, 53(6): 2443-63.
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) 69055 (3S,5R)-1-(2-((((2,2-dimethylhex-5-en-1-yl)oxy)carbonyl)amino)-3,3-dimethylbutanoyl)-5-(methoxycarbonyl)pyrrolidin-3-yl 4-vinylisoindoline-2-carboxylate   C32H45N3O7 详情 详情
(IX) 69063 3-bromo-o-xylene;2,3-Dimethylbromobenzene;3-Bromo-1,2-dimethylbenzene 576-23-8 C8H9Br 详情 详情
(X) 69064 1-bromo-2,3-bis(bromomethyl)benzene   C8H7Br3 详情 详情
(XI) 69065 2-benzyl-4-bromoisoindoline   C15H14BrN 详情 详情
(XII) 24920 tributyl(vinyl)stannane;Tributylvinylstannane;Vinyltributylstannane 7486-35-3 C14H30Sn 详情 详情
(XIII) 69066 2-benzyl-4-vinylisoindoline   C17H17N 详情 详情
(XIV) 69067 4-vinylisoindoline   C10H11N 详情 详情
(XV) 15780 1-(tert-butyl) 2-methyl (2S,4S)-4-hydroxytetrahydro-1H-pyrrole-1,2-dicarboxylate;(2S,4S)-1-tert-butyl 2-methyl 4-hydroxypyrrolidine-1,2-dicarboxylate C11H19NO5 详情 详情
(XVI) 69070 (2S,4S)-1-tert-butyl 2-methyl 4-((4-vinylisoindoline-2-carbonyl)oxy)pyrrolidine-1,2-dicarboxylate   C22H28N2O6 详情 详情
(XVII) 69068 4-bromoisoindoline hydrochloride;3-Bromo-1H-isoindoline Hydrochloride;4-Bromo-1H-isoindoline hydrochloride;4-Bromo-2,3-dihydro-1H-isoindole hydrochloride 923590-95-8 C8H8BrN.HCl 详情 详情
(XVIII) 69071 (2S,4S)-1-tert-butyl 2-methyl 4-((4-bromoisoindoline-2-carbonyl)oxy)pyrrolidine-1,2-dicarboxylate   C20H25BrN2O6 详情 详情
(XIX) 69072 potassium vinyltrifluoroborate;potassium trifluoro(vinyl)borate   C2H3BF3K 详情 详情
(XX) 69069 (3S,5S)-5-(methoxycarbonyl)pyrrolidin-3-yl 4-vinylisoindoline-2-carboxylate hydrochloride   C17H20N2O4.HCl 详情 详情
(XXI) 69073 2-((((2,2-dimethylhex-5-en-1-yl)oxy)carbonyl)amino)-3,3-dimethylbutanoic acid   C15H27NO4 详情 详情
(XXII) 28650 ethyl 2-methylpropanoate;ethyl isobutyrate 97-62-1 C6H12O2 详情 详情
(XXIII) 11720 4-Bromo-1-butene 5162-44-7 C4H7Br 详情 详情
(XXIV) 69074 2,2-dimethyl-5-hexen-1-ol   C8H16O 详情 详情
(XXV) 69075 (S)-2-amino-3,3-dimethylbutanoic acid;L-tert-leucine;L-2-Amino-3,3-dimethylbutanoic acid 20859-02-3 C6H13NO2 详情 详情
Extended Information