Gold(I)-Catalyzed Diastereoselective Hydroacylation of Terminal Alkynes with Glyoxals
作者:Shuai Shi、Tao Wang、Vanessa Weingand、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201307685
日期:2014.1.20
The reaction of an α‐ketoaldehyde and a terminalalkyne in the presence of piperidine and a catalytic amount of AuCl delivers 1,2‐dicarbonyl‐3‐enes, products of the formal hydroacylation of the triple bond. The scope of the method is broad; different aryl substituents on the dicarbonyl unit and on the alkyne are well tolerated. The products can be transformed selectively into vinylquinoxalines. Mechanistic
作者:Si Joon Park、In-Soo Hwang、Young Jun Chang、Choong Eui Song
DOI:10.1021/jacs.0c11815
日期:2021.2.17
hemithioacetals which proceeds viaenantioselective protonation of an ene-diol intermediate. The use of on-water condition turns on this otherwise extremely unreactive catalytic reaction as a result of the strengthened hydrogen bonds of water molecules near the hydrophobic reaction mixture. Furthermore, under on-water conditions, especially under biphasic microfluidic on-water conditions, access of bulk water into
水中前手性碳负离子的催化对映选择性质子化是生物系统中的一种常见转化,但由于质子在水中异常快速的运动会导致不受控制的外消旋质子化,因此这超出了合成化学家的能力。在这里,我们展示了水的关键作用,它能够通过烯二醇中间体的对映选择性质子化进行半硫缩醛的高度对映选择性乙二醛酶 I 模拟催化异构化。由于疏水反应混合物附近的水分子的氢键增强,因此水上条件的使用开启了这种原本极其不活泼的催化反应。此外,在水上条件下,特别是在双相微流体水上条件下,
Reaction of thiols with phenylglyoxal to give thiol esters of mandelic acid. II. Intramolecular general-base catalysis and change in rate-determining step
Efficient Lewis Acid Catalyzed Intramolecular Cannizzaro Reaction
作者:Albert E. Russell、Steven P. Miller、James P. Morken
DOI:10.1021/jo0010734
日期:2000.12.1
Synthesis and Reactivity of Cross-Conjugated Polyenones with a Planar Chirality
作者:Nathalie J. Marchand、Danielle M. Grée、Jacques T. Martelli、René L. Grée、Loïc J. Toupet
DOI:10.1021/jo9603643
日期:1996.1.1
The complexes 6 are the first examples of a novel class of cross conjugated polyenones bearing a planar chirality introduced by an organometallic moiety. Their synthesis is described using, as a key intermediate, the easily accessible new phosphorane 9. The free double bond of the selectively protected polyenes 6 reacts efficiently, although with low diastereoselectivities, in Diels-Alder or 1,3 dipolar cycloaddition reactions or with nucleophiles. Cyclopentyl radical also adds to 6, and this is the first example of a radical reaction in the presence of carbonyliron complexes. Decomplexation of the various adducts leads, in good yields, to the corresponding polyfunctionalized free dienes, which can be of further synthetic use.