Palladium-Catalyzed Synthesis and Isolation of Functionalized Allylboronic Acids: Selective, Direct Allylboration of Ketones
作者:Mihai Raducan、Rauful Alam、Kálmán J. Szabó
DOI:10.1002/anie.201207951
日期:2012.12.21
Textbook revision: Allylboronicacids, which are easily prepared from allylic alcohols, react readily and selectively with ketones without Lewis acid catalysts.
Palladium-Catalyzed Coupling of Allylboronic Acids with Iodobenzenes. Selective Formation of the Branched Allylic Product in the Absence of Directing Groups
作者:Sara Sebelius、Vilhelm J. Olsson、Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ja062585o
日期:2006.6.1
Palladium-catalyzedcouplingreactions of functionalized allylboronic acids with iodobenzenes were achieved under standard Suzuki-Miyauracoupling conditions. The couplingreactions afforded selectively the branched allylic products in high to excellent yields. In contrast to palladium-catalyzed nucleophilic substitution reactions proceeding via (eta3-allyl)palladiumintermediates, this process does
Stereocontrol in Synthesis of Homoallylic Amines. Syn Selective Direct Allylation of Hydrazones with Allylboronic Acids
作者:Arindam Das、Rauful Alam、Lars Eriksson、Kálmán J. Szabó
DOI:10.1021/ol501699x
日期:2014.7.18
Allylboronicacids directly react with acyl hydrazones, affording homoallylic amine derivatives. The reaction proceeds with very high syn selectivity, which is the opposite of the stereochemistry observed for allylboration of imines. The reaction can be carried out with both aromatic and aliphatic acyl hydrazones. Based on our studies the excellent syn stereochemistry can be explained by chelation
Selective Formation of Adjacent Stereocenters by Allylboration of Ketones under Mild Neutral Conditions
作者:Rauful Alam、Mihai, Raducan、Lars Eriksson、Kálmán J. Szabó
DOI:10.1021/ol401055m
日期:2013.5.17
Allylboronic acids readily react with a broad variety of ketones, affording homoallylic alcohols with adjacent quaternary and tertiary stereocenters. The reaction proceeds with very high anti stereoselectivity even if the substituents of the keto group have a similar size. a-Keto acids react with syn stereoselectivity probably due to the formation of acyl boronate intermediates. The allylation reactions proceed without added acids/bases under mild conditions. Because of this, many functionalities are tolerated even with in situ generated allylboronic acids.