Catalytic Enantioselective Iodoaminocyclization of Hydrazones
摘要:
The first catalytic enantioselective iodoaminocyclization of beta,gamma-unsaturated hydrazones has been developed with the help of a trans-1,2-diaminocyclohexane-derived bifunctional thiourea catalyst and allows for the direct access to Delta(2)-pyrazolines containing a quaternary stereogenic center in high yield with good enantioselectivity (up to 95% yield and 95:5 er).
The iridium-catalyzed asymmetric hydrogenation of 2-aryl allyl phthalimides to afford enantioenriched β-aryl-β-methyl amines is presented. Recently developed Ir-MaxPHOX catalysts are used for this enantioselective transformation. The mild reaction conditions and the feasible removal of the phthalimido group makes this catalytic method easily scalable and of great interest to afford chiral amines. The
Design, Synthesis, and Biological Evaluation of Semicarbazide-Sensitive Amine Oxidase (SSAO) Inhibitors with Anti-inflammatory Activity
作者:Eric Y. Wang、Hongfeng Gao、Luisa Salter-Cid、Jun Zhang、Li Huang、Erika M. Podar、Andrew Miller、Jingjing Zhao、Anne O'Rourk、Matthew D. Linnik
DOI:10.1021/jm050538l
日期:2006.4.1
examine the effect of inhibition of semicarbazide-sensitiveamineoxidase (SSAO; EC 1.4.3.6, also known as VAP-1) as a novel anti-inflammatory target, the structure/mechanism based design and synthesis of a series of novel hydrazino-containing small molecules are described. The in vitro biological results show that compounds 4a,c are highly potent SSAOinhibitors with notable selectivity toward SSAO over
Catalytic Enantioselective Iodoetherification of Oximes
作者:Chandra Bhushan Tripathi、Santanu Mukherjee
DOI:10.1002/anie.201304173
日期:2013.8.5
The first catalyticenantioselectiveiodoetherification of oximes is developed using commercially available N‐iodosuccinimide. In the presence of a dihydrocinchonidine‐derived thiourea (10 mol %), β,γ‐unsaturated oximes undergo facile iodoetherification to produce Δ2‐isoxazolines containing a quaternary stereogenic center generally in high yield with good to excellent enantioselectivity.
Desymmetrization of Diolefinic Diols by Enantioselective Amino‐thiocarbamate‐Catalyzed Bromoetherification: Synthesis of Chiral Spirocycles
作者:Daniel Weiliang Tay、Gulice Y. C. Leung、Ying‐Yeung Yeung
DOI:10.1002/anie.201310136
日期:2014.5.12
A facile, efficient, and highly diastereo‐ and enantioselectivebromoetherification of diolefinicdiols has been developed using an amino‐thiocarbamate catalyst. Further manipulations of the bromoether products enabled entry into a new class of spirocycles which are distinctively lacking in the literature.