Dramatic Effect of γ-Heteroatom Dienolate Substituents on Counterion Assisted Asymmetric Anionic Amino-Cope Reaction Cascades
作者:Pradipta Das、Michael D. Delost、Munaum H. Qureshi、Jianhua Bao、Jason S. Fell、Kendall N. Houk、Jon T. Njardarson
DOI:10.1021/jacs.1c00745
日期:2021.4.21
appear to proceed via the same pathway as the fluoride albeit with the added twist of a 3-exo-trig cyclization to yield chiral cyclopropane products with three stereocenters. When this same class of nucleophiles is substituted with a γ-nitro group, the Mannich-initiated cascade is now diverted to a β-lactam product instead of the amino-Cope pathway. These anionic asymmetric cascades are solvent- and counterion-dependent
ALLOSTERIC MODULATORS OF NICOTINIC ACETYLCHOLINE RECEPTORS
申请人:MERCK SHARP & DOHME CORP.
公开号:US20170275260A1
公开(公告)日:2017-09-28
The present disclosure relates to compounds of formula I that are useful as modulators of α7 nAChR, compositions comprising such compounds, and the use of such compounds for preventing, treating, or ameliorating disease, particularly disorders of the central nervous system such as cognitive impairments in Alzheimer's disease, Parkinson's disease, and schizophrenia, as well as for L-DOPA induced-dyskinesia and inflammation
Remote and Proximal Hydroaminoalkylation of Alkenes Enabled by Photoredox/Nickel Dual Catalysis
作者:Songlin Zheng、Wenlong Wang、Weiming Yuan
DOI:10.1021/jacs.2c08039
日期:2022.10.5
hydroaminoalkylation of activated alkenes that provides the β-selective products. The chain-walking of a Ni–H intermediate toward a carbonyl allows for the hydroaminoalkylation of unactivated alkenes at remote sp3 C–H sites. This method tolerates a broad substrate scope of both amines and alkenes as well as providing a streamlined synthesis of value-added β-amino acid derivatives from readily available
The exploration into challenging scenarios of the application of elementary reactions offers excellent opportunities for the development of unique transformations under organometallic catalysis. As a ubiquitous reaction of metal alkyl complexes, β-hydride elimination plays a crucial role in a number of important catalytic transformations. However, its functions in these catalytic cycles are limited
对基本反应应用的挑战性场景的探索为在有机金属催化下发展独特的转化提供了极好的机会。作为金属烷基配合物的普遍反应,β-氢化物消除在许多重要的催化转化中起着至关重要的作用。然而,它在这些催化循环中的功能仅限于释放烯烃产物或通过进一步迁移插入产生异构化中间体。在此,我们报道了 β-氢化物消除的精确操作能够实现自动串联铜催化,用于无向烯基 C-H 键与 CO 2的羧化。在这种转化中,促进了烷基铜中间体的 β-氢化物消除,同时它与 CO 反应2被压制。生成的氢化铜反过来与 CO 2反应,提供多任务催化剂的途径,这使得 C-H 键在两个机械上不同的催化循环中串联硼化/羧化。
PATEL B. A.; ZIEGLER C. B.; CORTESE N. A.; PLEVYAK J. E.; ZEBOVITZ T. C.;+, J. ORG. CHEM., 1977, 42, NO 24, 3903-3907
作者:PATEL B. A.、 ZIEGLER C. B.、 CORTESE N. A.、 PLEVYAK J. E.、 ZEBOVITZ T. C.、+