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).
Experimental and Computational Studies of Palladium-Catalyzed Spirocyclization via a Narasaka–Heck/C(sp<sup>3</sup> or sp<sup>2</sup>)–H Activation Cascade Reaction
es via a palladium-catalyzed tandem Narasaka–Heck/C(sp3 or sp2)–Hactivationreaction is reported here. The key step in this transformation is the activation of a δ-C–H bond via an in situ generated σ-alkyl-Pd(II) species to form a five-membered spiro-palladacycle intermediate. The concerted metalation-deprotonation (CMD) process, rate-determining step, and energy barrier of the entire reaction were
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
The combination of Pd(TFA)2 and KOH could efficiently catalyze the reaction of β-substituted allylic halides with arylboronic acids in water.
Pd(TFA)2和KOH的组合可以有效地催化β-取代烯丙基卤化物与芳基硼酸的反应在水中进行。
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.