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淺草漫漫銀蟲 (小有名氣)
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[求助]
英文文獻(xiàn)，急求翻譯
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Singh et al. designed an L-proline based chiral catalyst with a gem-diphenyl group at the β-carbon, which is essential for high enantioselectivities . So far, this catalyst has been used in aldol reactions only between an aldehyde and a ketone . To the best of our knowledge, this is the first time when enantioselective aldol reactions between two aliphatic aldehydes with Singh’s catalyst 1 are reported.With Singh’s catalyst, the stereochemistry of aldol products can be explained by their transition state ，which is based on a model supported by DFT calculations . Since aldehyde oxygen forms hydrogen bonds with the NH and OH groups of catalyst 1, the new C-C bond is formed from its Re face . The thermodynamically favorable E-enamine is mainly formed by giving syn-aldol products. |
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-08-04 19:50:02
淺草漫漫: 金幣+15, ★有幫助 2014-08-04 20:57:53
RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-08-04 19:50:02
淺草漫漫: 金幣+15, ★有幫助 2014-08-04 20:57:53
| Singh等人設(shè)計(jì)了一個(gè)手性催化劑，該催化劑是在L-脯氨酸的β-碳上加上了一個(gè)二苯基，這對(duì)增強(qiáng)其對(duì)映選擇性是必須的。到目前為止，這個(gè)催化劑僅用于醛和酮的羥醛縮合反應(yīng)。就我們目前所了解到的，這是第一次有報(bào)道，在辛格催化劑-1的催化作用下，兩個(gè)脂肪族醛類發(fā)生了對(duì)映選擇性羥醛縮合反應(yīng)。有了辛格催化劑，羥醛縮合反應(yīng)產(chǎn)物的立體化學(xué)可以通過他們的過渡狀態(tài)來解釋，這需要基于密度泛函理論計(jì)算模型。由于醛氧形成的氫鍵連接著催化劑-1的NH和OH組，所以新的C-C鍵是在它的反面形成的。熱力學(xué)上的最穩(wěn)定的E-烯胺主要就是由這種羥醛縮合反應(yīng)合成的產(chǎn)物。 |
2樓2014-08-04 19:48:16
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