Readily available from esters or ketones, cyclopropanols are inclined to undergo diverse ring-opening transformations. Their one-electron oxidation is a conventional way to β-carbonyl radicals. However, despite this fact, their application as a coupling partner in dual photoredox and nickel-catalyzed reactions with organic halides remains underdeveloped. Here, we report that the Ti(OiPr)4 additive
环丙醇很容易从酯或酮中获得,倾向于进行各种开环转化。它们的单电子氧化是β-羰基自由基的常规方式。然而,尽管如此,它们作为偶联伙伴在与有机卤化物的双重光氧化还原和镍催化反应中的应用仍然不成熟。在这里,我们报告了 Ti(O i Pr) 4添加剂使这种难以捉摸的与芳基溴和烯基溴的交叉偶联成为可能,从而产生 β 取代的酮。
Generation of β-Keto Radicals from Cyclopropanols Catalyzed by AgNO<sub>3</sub>
作者:Shunsuke Chiba、Zhengyan Cao、Serry Atta Atta El Bialy、Koichi Narasaka
DOI:10.1246/cl.2006.18
日期:2006.1
Various β-keto radicals are generated from cyclopropanols by treatment with a catalytic amount of AgNO3 and (NH4)2S2O8 as a reoxidant in the presence of pyridine. Thus, generated β-keto radicals react with alkenes to yield addition products.
ProPhenol Derived Ligands to Simultaneously Coordinate a Main‐Group Metal and a Transition Metal: Application to a Zn−Cu Catalyzed Reaction
作者:Barry M. Trost、Guoting Zhang、Minghao Xu、Xiaotian Qi
DOI:10.1002/chem.202104268
日期:2022.2.16
A new bi-functional ligandbearingchiralN-heterocycliccarbene (NHC) and prolinol moieties is designed and applied in the generation of a Cu/Zn hetero-bimetallic complex, which unlocks the asymmetric allylic alkylation reactions of allyl phosphates with zinc keto-homoenolates generated from cyclopropanols, leading to the formation of various γ-vinyl ketones with good regio- and enantio-selectivity
设计了一种新的带有手性 N-杂环卡宾(NHC) 和脯氨醇部分的双功能配体,并应用于生成 Cu/Zn 杂双金属配合物,从而解锁了磷酸烯丙酯与酮基高烯醇锌的不对称烯丙基烷基化反应由环丙醇生成,导致形成具有良好区域选择性和对映选择性的各种 γ-乙烯基酮。DFT 计算支持烯丙基磷酸酯与催化剂的螯合促进了 S N 2' 的添加,并且配体-底物空间相互作用解释了立体选择性结果。
SPIROCYCLIC DIGYDRO-THIAZINE AND DIHYDRO-OXAZINE BACE INHIBITORS, AND COMPOSITIONS AND USES THEREOF
申请人:Xu Ying-Zi
公开号:US20150087826A1
公开(公告)日:2015-03-26
Compounds are provided having a structure according to Formula (I): wherein A
1
, A
2
, A
3
, Y, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, m, n and p are defined herein. Further provided are pharmaceutical compositions including the compounds provided and methods of making and using the compounds and compositions as provided, e.g., in the treatment and prevention of various disorders, such as Alzheimer's disease.
SPIROCYCLIC DIHYDRO-THIAZINE AND DIHYDRO-OXAZINE BACE INHIBITORS, AND COMPOSITIONS AND USES THEREOF
申请人:IMAGO PHARMACEUTICALS, INC.
公开号:US20160272654A1
公开(公告)日:2016-09-22
Compounds are provided having a structure according to Formula (I): wherein A
1
, A
2
, A
3
, Y, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, m, n and p are defined herein. Further provided are pharmaceutical compositions including the compounds provided and methods of making and using the compounds and compositions as provided, e.g., in the treatment and prevention of various disorders, such as Alzheimer's disease.