Carbenoid-mediated elimination of sulfides and selenides. A mild and efficient method for introducing α,β-double bonds to electron-withdrawing substituents
作者:Arnaud Gautier、Goulnara Garipova、Reynald Deléens、Serge R. Piettre
DOI:10.1016/s0040-4039(02)00945-0
日期:2002.7
Cycloalkanes bearing both an electron-withdrawing group and an arylsulfenyl or arylselenenyl function in β-position are shown to react with 2 equiv. of a carbenoid species to generate the corresponding Michael acceptor. The reaction occurs under very mild conditions and affords the products in good to excellent yields. The process constitutes a useful alternative to the oxidation/syn-elimination sequence
TMAF-Catalyzed Conjugate Addition of Oxazolidinone and Thiols
作者:Vincent Dalla、Mickaël Ménand
DOI:10.1055/s-2004-836057
日期:——
TMAF (Me4NF) is a useful catalyst for the conjugate addition of oxazolidinone and thiols to a range of Michael acceptors including esters, ketones, nitroolefins and cinnamaldehyde.
Compounds for a controlled release of active molecules
申请人:——
公开号:US20040220074A1
公开(公告)日:2004-11-04
The present invention relates to the field of perfumery. More particularly, it concerns compounds comprising at least one &bgr;-oxy or &bgr;-thio carbonyl moiety capable of liberating a perfuming molecule such as, for example, an &agr;,&bgr;-unsaturated ketone, aldehyde or carboxylic ester. The present invention concerns also the use of the compounds in perfumery as well as the perfuming compositions or perfumed articles comprising the invention's compounds.
COMPOUNDS FOR A CONTROLLED RELEASE OF ACTIVE MOLECULES
申请人:Fehr Charles
公开号:US20090181878A1
公开(公告)日:2009-07-16
The present invention relates to the field of perfumery. More particularly, it concerns compounds comprising at least one β-oxy or β-thio carbonyl moiety capable of liberating a perfuming molecule such as, for example, an α,β-unsaturated ketone, aldehyde or carboxylic ester. The present invention concerns also the use of the compounds in perfumery as well as the perfuming compositions or perfumed articles comprising the invention's compounds.
Quinoxaline-specific enantioselective sulfa-michael reaction catalyzed by chiral phosphoric acid
作者:Xiongfei Deng、Shiqi Zhang、Hesen Huang、Xin Cui、Zhuo Tang、Guangxun Li
DOI:10.1016/j.cclet.2023.108145
日期:2023.1
Highly enantioselective sulfa-Michael additions (SMA) between 2-alkenyl quinoxalines and aromatic thiols are accomplished using a low loading of chiralphosphoricacid catalyst (1 mol%). It was confirmed by an investigation of a lot of azaarenes that the two C=N units of quinoxalines are indispensable for controlling the reaction enantioselectivities. A series of non-terminal 2-alkenes substituted