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【结 构 式】 
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【分子编号】48482 【品名】methyl (13R,15S)-17-(2-methoxyethyl)-1,11-diazatetracyclo[13.3.1.0(4,12).0(5,10)]nonadeca-4(12),5,7,9,17-pentaene-13-carboxylate 【CA登记号】 |
【 分 子 式 】C22H28N2O3 【 分 子 量 】368.476 【元素组成】C 71.71% H 7.66% N 7.6% O 13.03% |
合成路线1
该中间体在本合成路线中的序号：(VII)Condensation of the indoloazepine (I) bearing a chiral N-(1-naphthylethyl) substituent with 4-(1,3-dioxolan-2-yl)-6-methoxyhexanal (II) through a secodine-type intramolecular Diels-Alder reaction generated the epimeric mixture of pyrrolocarbazoles (III) along with minor amounts of their diastereoisomers (IV). The subsequent reductive ring cleavage of this mixture yielded the corresponding mixture of tricyclic compounds (V). Hydrogenolysis of the N-naphthylethyl group of (V), followed by chromatographic separation, gave the enantiomerically enriched secondary amines (VI). Acetal hydrolysis of (VI) with simultaneous cyclization of a transient aminoaldehyde provided the tetracyclic enamine (VII). Rearrangement of this enamine in refluxing toluene furnished the desired compound in 76% ee, which was further enriched to >98% ee by fractional crystallization.
| 【1】 Kuehne, M.E.; et al.; Enantioselective syntheses of coronaridine and 18-methoxycoronaridine. Tetrahedron 2001, 57, 11, 2085. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (IIIa) | 48475 | methyl (3aS,4R,11bR)-4-[(2S)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-3-[(1R)-1-(1-naphthyl)ethyl]-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-6-carboxylate | C36H42N2O5 | 详情 | 详情 | |
| (IIIb) | 48476 | methyl (3aS,4R,11bR)-4-[(2R)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-3-[(1R)-1-(1-naphthyl)ethyl]-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-6-carboxylate | C36H42N2O5 | 详情 | 详情 | |
| (IVa) | 48477 | methyl (3aR,4S,11bS)-4-[(2S)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-3-[(1R)-1-(1-naphthyl)ethyl]-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-6-carboxylate | C36H42N2O5 | 详情 | 详情 | |
| (IVb) | 48478 | methyl (3aR,4S,11bS)-4-[(2R)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-3-[(1R)-1-(1-naphthyl)ethyl]-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-6-carboxylate | C36H42N2O5 | 详情 | 详情 | |
| (VIa) | 48480 | methyl (5R,7S)-5-[(2R)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-1,2,3,4,5,6,7,8-octahydroazonino[5,4-b]indole-7-carboxylate | C24H34N2O5 | 详情 | 详情 | |
| (VIb) | 48481 | methyl (5R,7S)-5-[(2S)-2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-1,2,3,4,5,6,7,8-octahydroazonino[5,4-b]indole-7-carboxylate | C24H34N2O5 | 详情 | 详情 | |
| (I) | 48473 | methyl 3-[(1R)-1-(1-naphthyl)ethyl]-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole-5-carboxylate | C26H26N2O2 | 详情 | 详情 | |
| (II) | 48474 | 4-(1,3-dioxolan-2-yl)-6-methoxyhexanal | C10H18O4 | 详情 | 详情 | |
| (V) | 48479 | methyl 5-[2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-3-[(1R)-1-(1-naphthyl)ethyl]-1,2,3,4,5,6,7,8-octahydroazonino[5,4-b]indole-7-carboxylate | C36H44N2O5 | 详情 | 详情 | |
| (VII) | 48482 | methyl (13R,15S)-17-(2-methoxyethyl)-1,11-diazatetracyclo[13.3.1.0(4,12).0(5,10)]nonadeca-4(12),5,7,9,17-pentaene-13-carboxylate | C22H28N2O3 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XV)The condensation of allylmalonic acid diethyl ester (I) with 2-methoxyethyl bromide (II) by means of NaOEt in ethanol gives 2-allyl-2-(2-methoxyethyl)malonic acid diethyl ester (III), which is monodecarboxylated with LiCl in DMSO/DMF at 170 C to yield the pentenoic ester (IV). The reduction of the ester group of (IV) with LiAlH4 in dry ether affords the alcohol (V), which is oxidized to the corresponding aldehyde (VI) with (COCl)2 in dichloromethane. The protection of the aldehyde group of (VI) with ethyleneglycol (VII) and Ts-OH affords the cyclic ketal (VIII), which is treated with BH3/Me2S in dichloromethane to provide the primary alcohol (IX). The oxidation of (IX) with (COCl)2 as before gives the corresponding aldehyde (X), which is condensed with the indoloazepine (XI) in refluxing toluene, yielding the pyrrolocarbazole derivative (XII). The reductive ring opening of (XII) with NaBH4 in hot acetic acid affords the tricyclic intermediate (XIII), which is debenzylated with H2 over Pd/C in acetic acid to provide the secondary amine (XIV). The deprotection of the cyclic ketal group of (XIV) with HCl and HOAc, followed by treatment with NaOH, induces cyclization to the tetracyclic compound (XV), which is finally cyclized to the target compound in refluxing toluene.
| 【1】 Bandarage, U.K.; et al.; Total syntheses of racemic albifloranine and its anti-addictive congeners, including 18-methoxycoronaridine. Tetrahedron 1999, 55, 31, 9405. |
| 【2】 Glick, S.D.; Kuehne, M.E. (Albany Medical College; University of Vermont); Ibogamine congeners. US 6211360; WO 9705869 . |
| 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) | 51458 | Allylmalonic acid diethyl ester; Allyl malonic acid; Diethyl allylmalonate | 2049-80-1 | C10H16O4 | 详情 | 详情 |
| (II) | 51459 | 2-Methoxyethyl bromide; 2-Bromoethyl methyl ether; 1-Bromo-2-methoxyethane; Methyl 2-bromoethyl ether | 6482-24-2 | C3H7BrO | 详情 | 详情 |
| (III) | 51460 | diethyl 2-allyl-2-(2-methoxyethyl)malonate | C13H22O5 | 详情 | 详情 | |
| (IV) | 51461 | ethyl 2-(2-methoxyethyl)-4-pentenoate | C10H18O3 | 详情 | 详情 | |
| (V) | 51462 | 2-(2-methoxyethyl)-4-penten-1-ol | C8H16O2 | 详情 | 详情 | |
| (VI) | 51463 | 2-(2-methoxyethyl)-4-pentenal | C8H14O2 | 详情 | 详情 | |
| (VII) | 11295 | Polyethylene glycol;1,2-Ethanediol;Monoethylene glycol; Ethylene glycol | 107-21-1 | C2H6O2 | 详情 | 详情 |
| (VIII) | 51464 | 2-[1-(2-methoxyethyl)-3-butenyl]-1,3-dioxolane; 3-(1,3-dioxolan-2-yl)-5-hexenyl methyl ether | C10H18O3 | 详情 | 详情 | |
| (IX) | 51465 | 4-(1,3-dioxolan-2-yl)-6-methoxy-1-hexanol | C10H20O4 | 详情 | 详情 | |
| (X) | 48474 | 4-(1,3-dioxolan-2-yl)-6-methoxyhexanal | C10H18O4 | 详情 | 详情 | |
| (XI) | 51466 | methyl 3-benzyl-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole-5-carboxylate | C21H22N2O2 | 详情 | 详情 | |
| (XII) | 51468 | methyl (3aS,4R,11bR)-3-benzyl-4-[2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-6-carboxylate | C31H38N2O5 | 详情 | 详情 | |
| (XIII) | 51467 | methyl (5R)-3-benzyl-5-[2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-1,2,3,4,5,6,7,8-octahydroazonino[5,4-b]indole-7-carboxylate | C31H40N2O5 | 详情 | 详情 | |
| (XIV) | 51469 | methyl (5R)-5-[2-(1,3-dioxolan-2-yl)-4-methoxybutyl]-1,2,3,4,5,6,7,8-octahydroazonino[5,4-b]indole-7-carboxylate | C24H34N2O5 | 详情 | 详情 | |
| (XV) | 48482 | methyl (13R,15S)-17-(2-methoxyethyl)-1,11-diazatetracyclo[13.3.1.0(4,12).0(5,10)]nonadeca-4(12),5,7,9,17-pentaene-13-carboxylate | C22H28N2O3 | 详情 | 详情 |