| 5 | 1/1 | 返回列表 |
| 查看: 468 | 回復(fù): 3 | |||
| 本帖產(chǎn)生 1 個(gè) 翻譯EPI ,點(diǎn)擊這里進(jìn)行查看 | |||
| 當(dāng)前只顯示滿足指定條件的回帖,點(diǎn)擊這里查看本話題的所有回帖 | |||
ps331883028金蟲(chóng) (正式寫手)
|
[求助]
急求幫忙翻譯三段摘要,化學(xué)類的,非常感謝!。〖鼻螅。!
|
||
|
The key intermediates in this synthesis are the protected glycosyl-isatines 7 and 8 which were prepared in four steps from the corresponding glycosyl-indolines 1 and 2, respectively.The preparation of compound 7 has been previously detailed[2].Glycosyl-indolines 1 and 2 were prepared by glycosylation of the corresponding indolines. The hydroxy groups of the sugar moiety were first acetylated before aromatization with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and oxidation with chromium oxide to give the glycosylisatines 7 and 8 (Scheme 2). As mentioned in our previous paper for the synthesis of 1-(2,3,4,6-tetra-O-acetyl-b- D-glucopyranosyl)-5-nitroindolin-2,3-dione [2], the synthesis was more difficult in the presence of electron acceptor substituents. Indeed, the glycosylation step was achieved in 24 h for compound 1 and required 6 days for nitro analogue 2. The aromatization step was carried out at room temperature for 12 h for compound 5 and at 100 C for 3 days for nitro compound 6. At last, the oxidation with chromium oxide was performed and it resulted in 88% yield for compound 7 and only 46% yield for the 6-nitro analogue 8. The required diversely substituted indolin-2-one derivatives were either commercially available (5 and 6-chlorooxindole) or prepared by standard methods (Scheme 3). |

|
受保護(hù)的糖基-靛紅素7和8是這個(gè)合成中的關(guān)鍵中間體,它們分別由相應(yīng)的糖基-吲哚1和2通過(guò)四步反應(yīng)制備而成;衔7的制備之前已經(jīng)詳細(xì)介紹過(guò)[2]。糖基-吲哚1和2是由相應(yīng)的吲哚糖基化后制備而成的。糖的一部分羥基基團(tuán)在2,3-二氯-5,6-二氰-對(duì)苯醌 (DDQ)芳構(gòu)化和氧化鉻氧化之前首先被乙;,這樣得到糖基靛紅7和8。(方案2) 在我們先前文章中提到的合成1-(2,3,4,6-四面體-O-乙酰基-b-D-吡喃葡萄糖基)-5-硝基吲哚-2,3二酮[2],在有電子受體取代基存在的情況下合成更難發(fā)生。事實(shí)上,糖基化步驟進(jìn)行24小時(shí)得到化合物1,得到硝基類似物2需要進(jìn)行6天。芳構(gòu)化步驟在室溫下反應(yīng)12小時(shí)得到化合物5,在100℃反應(yīng)3天得到硝基化合物6。最后,氧化鉻的氧化反應(yīng)得到化合物7的產(chǎn)率是88%,而6-硝基類似物8的產(chǎn)率只有46%。 所需的不同的替代吲哚-2-酮的衍生品都是市場(chǎng)上可以買到的(5和6-氯氧化吲哚)或標(biāo)準(zhǔn)方法可以制備的(方案3)。 |
金蟲(chóng) (正式寫手)

木蟲(chóng) (小有名氣)
|
在這個(gè)合成中關(guān)鍵的中間體是受保護(hù)的糖基靛紅7和8,這些分別都是從糖基靛紅1和2通過(guò)四步反應(yīng)制備的。化合物7的制備之前已經(jīng)詳細(xì)講述。糖基靛紅1和2是通過(guò)相應(yīng)的二氫吲哚糖基化得到的。糖的烴基有一部分在DDQ芳構(gòu)化之前首先被乙;,用氧化鉻氧化得到糖基靛紅7和8。(方案2) 因?yàn)橹耙呀?jīng)提到1-(2,3,4,6-四面體-0-乙;-b-吡喃葡萄糖基)-5-硝基吲哚-2,3-二酮,在有受體存在的情況下合成更難發(fā)生。糖基化步驟需要反應(yīng)24小時(shí)得到化合物1,并且需要6天得到硝基類似物2.芳構(gòu)化步驟需在室溫下反應(yīng)12小時(shí)得到化合物5,并且在100℃3天得到硝基化合物6.最后再用氧化鉻進(jìn)行氧化,得到化合物7的產(chǎn)率是88%,而6-硝基類似物8只有46%的收率。 所需的不同的代替物吲哚-2-one派生物是市場(chǎng)上可以買到的(5,6-氯代烴吲哚)或者通過(guò)標(biāo)準(zhǔn)方法制備。(方案3) 有些專業(yè)詞可能不太準(zhǔn)確,僅供參考! |

| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 315分求調(diào)劑 +6 | 26考研上岸版26 2026-03-26 | 6/300 |
|
|---|---|---|---|---|
|
[考研] 277跪求調(diào)劑 +5 | 1915668 2026-03-27 | 8/400 |
|
|
[考研] 289求調(diào)劑 +7 | 新時(shí)代材料 2026-03-27 | 7/350 |
|
|
[考研] 一志愿南師大0703化學(xué) 275求調(diào)劑 +4 | Ripcord上岸 2026-03-27 | 4/200 |
|
|
[考研] 305求調(diào)劑 +5 | 哇盧卡庫(kù) 2026-03-26 | 5/250 |
|
|
[考研] 312求調(diào)劑 +9 | 上岸吧ZJY 2026-03-22 | 13/650 |
|
|
[考研] 調(diào)劑 +3 | 李嘉圖·S·路 2026-03-27 | 3/150 |
|
|
[考研] 調(diào)劑推薦 +5 | 清酒714 2026-03-26 | 6/300 |
|
|
[考研] 0703化學(xué)338求調(diào)劑! +6 | Zuhui0306 2026-03-26 | 7/350 |
|
|
[考研] 327求調(diào)劑 +7 | prayer13 2026-03-23 | 7/350 |
|
|
[考研] 【雙一流院校新能源、環(huán)境材料,材料加工與模擬招收大量調(diào)劑】 +4 | Higraduate 2026-03-22 | 8/400 |
|
|
[考研] 279求調(diào)劑 +6 | 紅衣隱官 2026-03-21 | 6/300 |
|
|
[考研] 085601求調(diào)劑總分293英一數(shù)二 +4 | 鋼鐵大炮 2026-03-24 | 4/200 |
|
|
[考研] 289求調(diào)劑 +17 | 碩星赴 2026-03-23 | 17/850 |
|
|
[考研] 考研調(diào)劑 +6 | 來(lái)好運(yùn)來(lái)來(lái)來(lái) 2026-03-21 | 7/350 |
|
|
[考研] 26考研-291分-廈門大學(xué)(085601)-柔性電子學(xué)院材料工程專業(yè)求調(diào)劑 +3 | min3 2026-03-24 | 4/200 |
|
|
[考研] 347求調(diào)劑 +4 | L when 2026-03-25 | 4/200 |
|
|
[考研] 284求調(diào)劑 +15 | Zhao anqi 2026-03-22 | 15/750 |
|
|
[考研] 0854電子信息求調(diào)劑 324 +4 | Promise-jyl 2026-03-23 | 4/200 |
|
|
[考研] 一志愿吉林大學(xué)材料與化工303分求調(diào)劑 +4 | 為學(xué)666 2026-03-24 | 4/200 |
|