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smth木蟲 (小有名氣)
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[求助]
哪位大俠幫幫忙翻譯成英文謝謝
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| 如何構建二氫吡唑環(huán)化合物已有許多文獻報道，但傳統(tǒng)的方法存在許多缺點如：步驟繁多，所用的催化劑昂貴，產率不高等。多組分一鍋法一直是化學研究領域的熱門研究課題，本文以肼、烯和醛三組分通過一鍋法合成4,5-二氫吡唑衍生物，所用到的催化劑為Cu(OTf)2, 該方法經(jīng)連續(xù)的Mannich/環(huán)化/氧化過程，中間體無需分離，一鍋法即可得1,3,5-三取代4,5-二氫吡唑。三氟甲基磺酸銅作為單一的催化劑，同時催化了三個反應過程。反應條件溫和，操作簡單，所需原料廉價易得，底物適用范圍廣，是一種高效構建二氫吡唑環(huán)的方法。 |
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生化道長
至尊木蟲 (知名作家)
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
sltmac: 金幣+1 2012-04-11 09:56:40
sltmac: 金幣+23 2012-04-26 10:44:25
sltmac: 回帖置頂 2012-04-26 10:44:33
sltmac: 金幣+1 2012-04-11 09:56:40
sltmac: 金幣+23 2012-04-26 10:44:25
sltmac: 回帖置頂 2012-04-26 10:44:33
| There are many papers about how to construct dihydro-pyrazole ring compound. But triditional methods have a lot of disadvantages such as complex procedures, expensive reagents, low productivity, ect. Multi-component one-pot method is always hot research topic. This work employed this method to synthesize 4,5 - dihydro-pyrazole derivatives using hydrazine, allyl and aldehyde component as subtrate. The catalyst used was Cu(OTf)2. This method went through the continuous process of Mannich/cyclization/oxidation, thus obtained 1,3,5 - trisubstituted 4,5 - dihydro-pyrazole via one-pot method with no need of intermediates separation. Trifluoromethyl sulfonic acid copper catalyzed three reaction processes as a single catalyst. This method is highly efficent in constructing dihydro-pyrazole ring due to its advantages including mild reaction conditions, simple operation, required raw materials cheap and easily available, and wide range of substrates. |
2樓2012-04-10 22:38:01
YH_ChowF
木蟲 (正式寫手)
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Mally89: 金幣+1, 感謝應助！~歡迎常來！~吼吼！~\(^o^)/~ 2012-04-20 12:57:21
smth: 金幣+2, 翻譯EPI+1 2012-04-22 10:24:09
sltmac: 金幣+50 2012-04-26 10:44:13
Mally89: 金幣+1, 感謝應助！~歡迎常來！~吼吼！~\(^o^)/~ 2012-04-20 12:57:21
smth: 金幣+2, 翻譯EPI+1 2012-04-22 10:24:09
sltmac: 金幣+50 2012-04-26 10:44:13
| It has been reported how to construct pyrazoline cyclic compound in many literatures, but the traditional method has many disadvantages, such as various step, expensive used catalyst, and low yield. The multi-component one-pot has always been a hot research topic in the chemical research field. The paper synthetizes 4, 5- pyrazoline derivatives from hydrazine, alkene, and aldehyde by one-pan. The used catalyst is Cu (OTf) 2. The method passes through continuous Mannich/cyclization/oxidation process, and has no need for separating intermediates, which can prepare 1-3, 5-tris 4,5- pyrazoline. Tri-fluoro methyl sulfonic acid copper is used as single catalyst, simultaneity catalyzing three reaction processes. It has the advantages of mild reaction condition, simple operation, low price of raw material, and wide scope of application for substrate. It is an effecient method for constructing pyrazoline. |
3樓2012-04-15 17:05:47
lxg133298
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Stay Hungry. Stay Foolish.
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Mally89: 金幣+1, 感謝應助！~歡迎常來！~吼吼！~\(^o^)/~ 2012-04-20 12:57:27
smth: 金幣+5 2012-04-22 10:24:19
sltmac: 金幣+20 2012-04-26 10:44:31
Mally89: 金幣+1, 感謝應助！~歡迎常來！~吼吼！~\(^o^)/~ 2012-04-20 12:57:27
smth: 金幣+5 2012-04-22 10:24:19
sltmac: 金幣+20 2012-04-26 10:44:31
|
There have reported so many papers about how to construct dihydro-pyrazole ring compound so far. however, because of these triditional methods have a lot of disadvantages such as complex procedures, expensive reagents, low productivity, ect. It is still a challenge for us to find a better approach to solve that problem！The one-pot method of Multi-component is a very attractive hot research field! In this paper, we employed this method to synthesize 4,5 - dihydro-pyrazole derivatives using hydrazine, allyl and aldehyde component as subtrate. The catalyst used was Cu(OTf)2. This method underwent a continuous process of Mannich/cyclization/oxidation, thus obtained 1,3,5 - trisubstituted 4,5 - dihydro-pyrazole via one-pot method with no need of intermediates separation. Trifluoromethyl sulfonic acid copper catalyzed three reaction processes as a single catalyst. .The mild reaction conditions, simple operation, the required raw materials, cheap and easy to get, the substrate applicable to a wide range, is an efficient build dihydro-pyrazole ring.  |
4樓2012-04-16 17:35:20
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