Organocatalytic selenosulfonylation of the C–C doublebond of α,β-unsaturatedketones to construct two contiguous stereogenic centers in an aqueous medium was described. A series of α-selenyl and β-sulfonyl ketones with various functional groups were synthesized in good yields and enantioselectivities with saturated NaCl solution as the solvent. In addition, this protocol had been successfully scaled
A general strategy for the hydroalkylation of vinyl ketones using ethers catalyzed by an iron catalyst is described. This catalytic method permits direct transformation of easily accessible and abundant precursors into highly substituted, structurally diverse and functionally concentrated products.
The first allylic carbonylation reaction of allylic acetates with aryl boronic acids has been developed.
已开发出烯丙基乙酸酯与芳基硼酸的第一个烯丙基羟酰化反应。
Decarboxylative Allylation of Glyoxylic Acids with Diallyl Carbonate
作者:Filipe Manjolinho、Matthias F. Grünberg、Nuria Rodríguez、Lukas J. Gooßen
DOI:10.1002/ejoc.201200766
日期:2012.9
ketones. The key advantage of the new reaction protocol is that preformation of the allyl esters is not required. The reaction is believed to proceed via phosphane-mediated decarboxylation of the α-oxocarboxylates, leading to acyl anionequivalents that are allylated within the coordination sphere of the palladium catalyst. Under the reaction conditions, the double bond then migrates into conjugation
Phase-Transfer-Catalyzed Asymmetric Synthesis of Chiral<i>N</i>-Substituted Pyrazoles by Aza-Michael Reaction
作者:Su-Jeong Lee、Ju-Yeon Bae、Chang-Woo Cho
DOI:10.1002/ejoc.201500940
日期:2015.9
cinchona-based phase-transfer-catalyzed asymmetric aza-Michael reaction of pyrazole with various α,β-unsaturated ketones has been developed for the preparation of chiral N-substituted pyrazoles. This reaction provided the desired products in good yields (up to 99 %) with excellent enantioselectivities (87–94 % ee). In addition, the reaction of 3-methyl-1H-pyrazole, an unsymmetrically substituted pyrazole