Organocatalyzed enantioselective aldol reaction of 1H-pyrrole-2,3-diones.

Organocatalyzed enantioselective aldol reaction of 1H-pyrrole-2,3-diones.
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DOI:
10.1016/j.tetlet.2011.11.056
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发表时间:
2012-01-18
影响因子:
1.8
通讯作者:
Zhao, Cong-Gui
Zhao, Cong-Gui
中科院分区:
化学4区
文献类型:
--
作者:
Bhanushali, Mayur;Zhao, Cong-Gui

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首次研究了脯氨酸衍生物或金鸡纳碱衍生物伯胺催化4,5-二氧代-2-芳基-4,5-二氢-1H-吡咯-3-羧酸1-苄酯与酮的交叉羟醛缩合反应。发现反式-4-苯甲酰氧基-L-脯氨酸(15)是无环酮的最佳催化剂。对于环己酮,以9-脱氧-9-表氨基奎宁(18)为催化剂,外消旋1,1 ′-联萘-2,2 ′-二基磷酸氢酯(19)为助催化剂,获得了最好的结果。使用这些方案,3-烷基-3-羟基-1H-吡咯-2(3 H)-酮衍生物以优异的产率和良好至高的ee值(高达94%ee)得到。
The enantioselective cross aldol reaction of 1-benzyl 4,5-dioxo-2-aryl-4,5-dihydro-1H-pyrrole-3-carboxylates and ketones was studied with proline derivatives or cinchona alkaloid-derived primary amines as the catalysts for the first time. trans-4-Benzoyloxy-L-proline (15) was found to be the best catalyst for acyclic ketones. For cyclohexanone, the best results were achieved with 9-deoxy-9-epi-aminoquinine (18) as the catalyst in the presence of racemic 1,1'-binaphthyl-2,2'-diyl hydrogen phosphate (19) as the cocatalyst. Using these protocols, 3-alkyl-3-hydroxy-1H-pyrrol-2(3H)-one derivatives were obtained in excellent yields and good to high ee values (up to 94% ee).
DOI: 10.1021/ol702901z
发表时间: 2008-01-17
期刊: ORGANIC LETTERS
影响因子: 5.2
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