六亚甲基四胺通过一锅三组分程序在水介质中通过芳族醛,丙二腈和β-酮酸酯的反应催化新的多官能化4 H-吡喃的合成。通过两种方法进行反应物的添加导致获得相似的结果。使用催化量的六亚甲基四胺不仅代表了反应的经济面,而且由于使用了水,因此组织了绿色安全的反应条件。因此,当前的策略提供了高生产率,方便操作和环境友好的优点。所有产物的结构均通过元素分析,IR,1 H NMR和13 C NMR光谱证实。
Reaction of Corey Ylide with α,β-Unsaturated Ketones: Tuning of Chemoselectivity toward Dihydrofuran Synthesis
作者:Alexey O. Chagarovsky、Ekaterina M. Budynina、Olga A. Ivanova、Elena V. Villemson、Victor B. Rybakov、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/ol500877c
日期:2014.6.6
A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.
<i>Retracted:</i>
Effective and Green One‐Pot Multicomponent Synthesis of Novel Derivatives of 4
<i>H</i>
‐Pyrans in the Presence of Hexamethylenetetramine as Catalyst in Water Medium
作者:Maysam Habibi、Azizollah Habibi、Saber Hakimi Nasab、Hadi Dolati、Seyedeh Mahbobeh Mahdavi
DOI:10.1002/jhet.2781
日期:2017.5
Hexamethylenetetramine (HMTA) catalyzes synthesis of new polyfunctionalized 4H‐pyrans by reaction of aromatic aldehyde, malononitrile, and β‐keto esters via one‐pot three‐component procedure in water medium. Addition of reactants was performed by two methods led to achieve similar results. Using HMTA in catalytic amount not only represents the economic face of the reaction, but also due to the use
A select route: By selecting the appropriate ligand, dihydrofurans and dihydrobenzoxepines can be chemoselectively formed in moderate to good yields with good to excellent diastereocontrol from identical starting materials (see scheme).
Preparation of Tetrasubstituted Furans via Intramolecular Wittig Reactions with Phosphorus Ylides as Intermediates
作者:Tzu-Ting Kao、Siang-en Syu、Yi-Wun Jhang、Wenwei Lin
DOI:10.1021/ol101080q
日期:2010.7.2
functional furans can be efficiently generated in one step at room temperature within 10 min to 21 h in moderate to high yields (60−99%). The reaction was proposed to proceed via intramolecular Wittig-type reactions, using phosphorus ylides as intermediates.
Effective and Green One-Pot Multicomponent Synthesis of Novel Derivatives of 4<i>H</i>-Pyrans in the Presence of Hexamethylenetetramine as Catalyst in Water Medium
作者:Maysam Habibi、Azizollah Habibi、Saber Hakimi Nasab、Hadi Dolati、Seyedeh Mahbobeh Mahdavi
DOI:10.1002/jhet.2748
日期:2017.3
Hexamethylenetetramine catalyzes synthesis of new polyfunctionalized 4H‐pyrans by the reaction of aromatic aldehyde, malononitrile, and β‐keto esters via one‐pot three‐component procedure in water medium. Addition of reactants was performed by two methods led to achieve similar results. Using hexamethylenetetramine in catalytic amount not only represents the economic face of the reaction but also due
六亚甲基四胺通过一锅三组分程序在水介质中通过芳族醛,丙二腈和β-酮酸酯的反应催化新的多官能化4 H-吡喃的合成。通过两种方法进行反应物的添加导致获得相似的结果。使用催化量的六亚甲基四胺不仅代表了反应的经济面,而且由于使用了水,因此组织了绿色安全的反应条件。因此,当前的策略提供了高生产率,方便操作和环境友好的优点。所有产物的结构均通过元素分析,IR,1 H NMR和13 C NMR光谱证实。