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【结 构 式】

【分子编号】46041

【品名】5,6-dimethyl-1,3-dihydro-2H-inden-2-one

【CA登记号】

【 分 子 式 】C11H12O

【 分 子 量 】160.21568

【元素组成】C 82.46% H 7.55% O 9.99%

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:(VII)

Knoevenagel condensation of 3,4-dimethylbenzaldehyde (I) with malonic acid in the presence of piperidine afforded dimethylcinnamic acid (II), which was reduced to the saturated acid (III) by catalytic hydrogenation. Conversion of (III) to the corresponding acid chloride, followed by Friedel-Crafts cyclization, gave rise to the 1-indanone (IV). This was isomerized to the desired 2-indanone (VII) by the sequence of ketone reduction, followed by acidic dehydration of the resulting alcohol to give indene (V), which was converted to epoxide (VI) and then Lewis-acid promoted rearrangement to the 2-indanone (VII). Condensation of ketone (VII) with benzylamine and subsequent addition of trimethylsilyl cyanide to the resulting imine furnished amino nitrile (VIII). After reduction of (VIII) to the diamine (IX) with LiAlH4, the N-benzyl group was removed by transfer hydrogenolysis, yielding (X). Condensation of diamine (X) with formamidine acetate produced the target imidazoline, which was finally isolated as the fumarate salt.

1 Lacoste, J.-M.; Verbeuren, T.J.; Cordi, A.; Descombes, J.-J.; Couchay, C.; Spiro[(1,3-diazacyclopent-1-ene)-5,2'-(5',6'-dimethylindane)]: A new alpha-adrenergic partial agonist. Two synthetic approaches. 16th Int Symp Med Chem (Sept 18 2000, Bologna) 2000, Abst PA-83.
2 Cordi, A.; Lacoste, J.-M.; Laubie, M.; Verbeuren, T.; Descombes, J.-J. (ADIR et Cie.); Benzospiroalkene derivs., process for their preparation and pharmaceutical compsns. containing them. CA 2128359; EP 0635497; FR 2709306; JP 1995304753; US 5436261 .
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) 46036 3,4-dimethylbenzaldehyde 5973-71-7 C9H10O 详情 详情
(II) 46037 (Z)-3-(3,4-dimethylphenyl)-2-propenoic acid C11H12O2 详情 详情
(III) 40285 3-(3,4-dimethylphenyl)propionic acid C11H14O2 详情 详情
(IV) 46038 5,6-dimethyl-1-indanone C11H12O 详情 详情
(V) 46039 5,6-dimethyl-1H-indene C11H12 详情 详情
(VI) 46040 3,4-dimethyl-6,6a-dihydro-1aH-indeno[1,2-b]oxirene C11H12O 详情 详情
(VII) 46041 5,6-dimethyl-1,3-dihydro-2H-inden-2-one C11H12O 详情 详情
(VIII) 46042 2-(benzylamino)-5,6-dimethyl-2-indanecarbonitrile C19H20N2 详情 详情
(IX) 46043 N-[2-(aminomethyl)-5,6-dimethyl-2,3-dihydro-1H-inden-2-yl]-N-benzylamine; 2-(aminomethyl)-N-benzyl-5,6-dimethyl-2-indanamine C19H24N2 详情 详情
(X) 46044 2-(aminomethyl)-5,6-dimethyl-2-indanamine; (2-amino-5,6-dimethyl-2,3-dihydro-1H-inden-2-yl)methylamine C12H18N2 详情 详情
Extended Information