S<sub>N</sub>2″-Selective and Enantioselective Substitution with Unsaturated Organoboron Compounds and Catalyzed by a Sulfonate-Containing NHC-Cu Complex
作者:Yuebiao Zhou、Ying Shi、Sebastian Torker、Amir H. Hoveyda
DOI:10.1021/jacs.8b10885
日期:2018.12.5
53-89% yield, 69-96% SN2″ selectivity, 98:2 to >98:2 E: Z ratio, and 94:6-98:2 er. Insight regarding several of the unique mechanistic attributes of the catalytic process was obtained on the basis of kinetic isotope effect measurements and DFT studies. These investigations indicate that cationic π-allyl-Cu complexes are likely intermediates, clarifying the role of the s-cis and s-trans conformers of
Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective
Enantioselective 6-endo bromoaminocyclization of 2,4-dienyl N-tosylcarbamates catalyzed by a chiral phosphine oxide-Sc(OTf)<sub>3</sub> complex. A dramatic additive effect
作者:Hu Huang、Hongjie Pan、Yudong Cai、Mao Liu、Hua Tian、Yian Shi
DOI:10.1039/c5ob00001g
日期:——
This paper describes an effective enantioselective 6-endo bromoaminocyclization of 2,4-dienyl N-tosylcarbamates catalyzed by a chiral phosphine oxide-Sc(OTf)3 complex with a dramatic additive effect.
Compounds reducing malodour perception and the use thereof
申请人:CHEMCOM S.A.
公开号:US11382848B2
公开(公告)日:2022-07-12
The present invention relates to new malodour-counteracting agents of formula (I) or stereoisomers thereof, particularly useful in blocking the olfactory perception of androstenone, Formula (I), wherein R1, R2, R3, R4, R5, R6, R7 and X have the same meaning as that defined in the claims. The present invention also relates to consumer products comprising said agents. The present invention also relates to the use of said agents to suppress or attenuate undesirable odour, as well as to methods to suppress or attenuate undesirable odour employing said compounds.
本发明涉及式(I)或其立体异构体的新型恶臭抗衡剂,特别适用于阻断雄烯酮的嗅觉感知,式(I),其中 R1、R2、R3、R4、R5、R6、R7 和 X 与权利要求书中定义的含义相同。本发明还涉及包含上述制剂的消费品。本发明还涉及使用所述制剂抑制或减弱不良气味,以及使用所述化合物抑制或减弱不良气味的方法。
Tandem Dearomatization/Enantioselective Allylic Alkylation of Pyridines
作者:Steffen Greßies、Lars Süße、Tyler Casselman、Brian M. Stoltz
DOI:10.1021/jacs.3c02470
日期:2023.6.7
of substituted pyridines leading to N-protected tetrahydropyridines with outstanding enantioselectivity (up to 97% ee). An iridium(I)-catalyzed dearomative 1,2-hydrosilylation of pyridines enables the use of N-silyl enamines as a new type of nucleophile in a subsequent palladium-catalyzed asymmetric allylicalkylation. This telescoped process overcomes the intrinsic nucleophilic selectivity of pyridines