- Tetraalkylammonium and 1,3-dialkylimidazolium salts with fluorinated anions as recoverable phase-transfer catalysts in solid base-promoted cross-aldol condensations
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Tetraalkylammonium and 1,3-dialkylimidazolium tetrafluoroborates and hexafluorophosphates were employed for the first time as recoverable phase-transfer catalysts in multiphase reactions of CH-acids, in particular in solid base-pro-moted cross-aldol condensations. The catalysts retained their catalytic activity over several reaction cycles.
- Kryshtal, Galina V.,Zhdankina, Galina M.,Zlotin, Sergei G.
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- Dehydrogenative β-Arylation of Saturated Aldehydes Using Transient Directing Groups
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An unprecedented cross-dehydrogenative-coupling (CDC) reaction of saturated aldehyde β-C-H with arenes to form cinnamaldehydes via the cleavages of four C-H bonds has been developed. The reaction possesses complete E-stereoselectivity for the C=C double bond. The protocol is featured by atom and step economy, mild reaction conditions, and convenient operation.
- Zhang, Xing-Long,Pan, Gao-Fei,Zhu, Xue-Qing,Guo, Rui-Li,Gao, Ya-Ru,Wang, Yong-Qiang
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supporting information
p. 2731 - 2735
(2019/04/30)
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- Copper-Catalyzed Stereospecific Hydroboration of Internal Allylic Alcohols
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An effective Cu-catalyzed stereospecific hydroboration of aliphatic and aromatic 1,1,2-trisubstituted internal allylic alcohols has been reported. This reaction proceeds via a silyl ether transient protection of allylic alcohols and subsequent stereospecific hydroboration. Followed by an oxidative workup, an array of acyclic, cyclic, and heterocyclic 1,3-diols was synthesized in good to excellent yields with good functional group tolerance and excellent diastereomeric ratios (> 20:1).
- Ji, Enhui,Meng, Haiwen,Zheng, Yue,Ramadoss, Velayudham,Wang, Yahui
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supporting information
p. 7367 - 7371
(2019/11/22)
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