【结 构 式】 |
【分子编号】50609 【品名】4-bromobutanal 【CA登记号】 |
【 分 子 式 】C4H7BrO 【 分 子 量 】151.00298 【元素组成】C 31.82% H 4.67% Br 52.92% O 10.6% |
合成路线1
该中间体在本合成路线中的序号:(III)The reaction of tetrahydrofuran (I) with HBr gives 4-bromobutanol (II), which is oxidized with NaOCl and TEMPO to yield the aldehyde (III). The reaction of (III) with ethyleneglycol and Ts-OH provides the cyclic ketal (IV), which is submitted to a Grignard condensation with diethyl oxalate (V) and Mg to give the alpha-ketoester (VI). The hydrolysis of (VI) with LiOH yields the corresponding alpha-ketoacid (VII), which is submitted to a stereoselective amination with ammonia and phenylalanine dehydrogenase to afford 2(S)-amino-5-(1,3-dioxol-2-yl)pentanoic acid (VIII). The reaction of (VIII) with SOCl2 and Me-OH provides 2(S)-amino-5,5-dimethoxypentanoic acid methyl ester (IX). The reaction of L- homocystine (X) with Boc2O gives the N-protected-L-homocystine (XI), which is condensed with pentanoic ester (IX) to yield the dimeric adduct (XII). The cleavage of (XII) with dithiothreitol (DTT) affords the monomeric intermediate (XIII), which is finally cyclized by means of Ms-OH to provide the target pyrido[2,1-b][1,3]thiazepine intermediate (XIV).
【1】 Patel, R.N.; Enzymatic synthesis of chiral intermediates for omapatrilat, an antihypertensive drug. Biomol Eng 2001, 17, 6, 167. |
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) | 41419 | tetrahydrofuran | 109-99-9 | C4H8O | 详情 | 详情 |
(II) | 50608 | Tetramethylene Bromohydrin; 4-Bromo-1-butanol;4-bromobutan-1-ol | 33036-62-3 | C4H9BrO | 详情 | 详情 |
(III) | 50609 | 4-bromobutanal | C4H7BrO | 详情 | 详情 | |
(IV) | 50610 | 2-(3-bromopropyl)-1,3-dioxolane | C6H11BrO2 | 详情 | 详情 | |
(V) | 17571 | Diethyl oxalate; Ethyl 2-ethoxy-2-oxoacetate | 95-92-1 | C6H10O4 | 详情 | 详情 |
(VI) | 50611 | ethyl 5-(1,3-dioxolan-2-yl)-2-oxopentanoate | C10H16O5 | 详情 | 详情 | |
(VII) | 50612 | 5-(1,3-dioxolan-2-yl)-2-oxopentanoic acid | C8H12O5 | 详情 | 详情 | |
(VIII) | 50613 | (2S)-2-amino-5-(1,3-dioxolan-2-yl)pentanoic acid | C8H15NO4 | 详情 | 详情 | |
(IX) | 22504 | methyl (2S)-2-amino-6,6-dimethoxyhexanoate | C9H19NO4 | 详情 | 详情 | |
(X) | 42169 | (2S)-2-amino-4-[[(3S)-3-amino-3-carboxypropyl]disulfanyl]butyric acid | C8H16N2O4S2 | 详情 | 详情 | |
(XI) | 50614 | (2S)-2-[[(benzyloxy)carbonyl]amino]-4-[((3S)-3-[[(benzyloxy)carbonyl]amino]-3-carboxypropyl)disulfanyl]butyric acid | C24H28N2O8S2 | 详情 | 详情 | |
(XII) | 50615 | dimethyl (7S,10S,17S,20S)-10,17-bis[[(benzyloxy)carbonyl]amino]-3,24-dimethoxy-9,18-dioxo-2,25-dioxa-13,14-dithia-8,19-diazahexacosane-7,20-dicarboxylate | C42H62N4O14S2 | 详情 | 详情 | |
(XIII) | 50616 | methyl (2S)-2-[((2S)-2-[[(benzyloxy)carbonyl]amino]-4-sulfanylbutanoyl)amino]-6,6-dimethoxyhexanoate | C21H32N2O7S | 详情 | 详情 | |
(XIV) | 50617 | (4S,7S,10aS)-4-[[(benzyloxy)carbonyl]amino]-5-oxooctahydro-7H-pyrido[2,1-b][1,3]thiazepine-7-carboxylic acid | C18H22N2O5S | 详情 | 详情 |