The oxidation of diphenyldiselenide with ammonium peroxydisulphate is a very simple and efficient method to produce phenylselenium cations in the absence of nucleophilic counter ions. The reaction carried out in the presence of an olefin, in acetonitrile or propionitrile containing trifluoromethanesulphonic acid and water afforded the amidoselenenylation products in good yield. The intramolecular
Electrochemical oxidative cyclization of olefinic carbonyls with diselenides
作者:Zhipeng Guan、Yunkun Wang、Huamin Wang、Yange Huang、Siyuan Wang、Hongding Tang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9gc02665g
日期:——
The tandem cyclization of olefinic carbonyls with easily accessible diselenides facilitated by electrochemical oxidation has been successfully developed, which provides an environmentally friendly method for the construction of C–Se and C–O bonds simultaneously. A series of seleno dihydrofurans and seleno oxazolines, bearing fragile heterocycles, subtle C–I bonds and supernumerary vinyl groups, were
chemoselective reaction between 5-aminoisoxazoles and α-diazocarbonyl compounds has been described. Both Wolff rearrangement and N–H insertion products can be obtained selectively by the judicious choice of reaction conditions. In the case of the Wolff rearrangementreactions, the N-isoxazole amides are accessed as the sole products under thermal conditions. On the other hand, α-amino acid derivatives
Enantio- and Diastereoselective Mannich-Type Reactions of α-Cyano Ketones with<i>N</i>-Boc Aldimines Catalyzed by Chiral Bifunctional Urea
作者:Ju Hee Lee、Dae Young Kim
DOI:10.1002/adsc.200900268
日期:2009.8
The catalytic enantioselective electrophilic Mannich-typereaction promoted by chiralbifunctional organocatalysts is described. The treatment of α-cyanoketones with N-Boc-aldimines under mild reaction conditions afforded the corresponding β-amino-α-cyano ketones with excellent diastereoselectivities (up to syn/anti=100/0), and excellent enantioselectivities (up to 99% ee).
描述了由手性双官能有机催化剂促进的催化对映选择性亲电曼尼希型反应。在温和的反应条件下,用N -Boc-醛亚胺处理α-氰基酮,得到相应的β-氨基-α-氰基酮,具有非对映选择性(高达syn / anti = 100/0)和出色的对映选择性(高达99) %ee)。
Catalytic Asymmetric Electrophilic α-Amination
of α-Cyanoketones in the Presence of Chiral Palladium Complexes
作者:Dae Kim、Ju Lee、Hyoung Bang
DOI:10.1055/s-2008-1078564
日期:——
The catalytic enantioselective electrophilic α-amination promoted by chiral palladium complexes is described. Treatment of α-cyanoketones with azodicarboxylates as electrophilic amination reagents under mild reaction conditions afforded the corresponding α-amino α-cyanoketones with excellent enantiomeric excesses (81-95% ee).