通过Na 2 S 2 O 4介导的(2-(2-硝基苯基)环氧乙烷-1-基)(芳基)甲酮(邻硝基苯甲酰苯甲酮氧化物)的还原环化反应,可以简单地合成3-羟基喹啉。
摘要:
已经开发了一种有效的连二亚硫酸钠(Na 2 S 2 O 4)介导的方法,该方法通过原位Meinwald重排/邻硝基苯甲酰苯乙酮氧化物的分子内还原环化反应来构建3-羟基喹啉。实用的方法是在温和的反应条件下具有优异的官能团相容性,且产率高达98%。此外,进一步的操作成功地提供了4-溴取代的衍生物,其可以为探索3-羟基喹啉的生物活性类似物提供有希望的潜在应用。
Catalytic asymmetric darzens condensation in the presence of bovine serum albumin.
作者:Rita Annunziata、Stefano Banfi、Stefano Colonna
DOI:10.1016/s0040-4039(00)94856-1
日期:1985.1
Darzenscondensation of aromatic aldehydes with phenacyl halides in the presence of a catalytic amount of bovine serum albumin afforded the corresponding epoxyketones in up to 62% e.e.
N-Heterocyclic Carbene Catalyzed Oxidative Coupling of Alkenes/ α-Bromoacetophenones with Aldehydes: A Facile Entry to α,β-Epoxy Ketones
作者:Rambabu N. Reddi、Pragati K. Prasad、Arumugam Sudalai
DOI:10.1002/anie.201507363
日期:2015.11.16
A novel, N‐heterocycliccarbene (NHC) catalyzed direct oxidative coupling of styrenes with aldehydes has been described for the synthesis of α,β‐epoxy ketones in good yields. This unprecedented regioselective oxidative coupling employs NBS/DBU/DMSO (DBU=1,8‐diazabicyclo [5.4. 0] undec‐7‐ene, DMSO=dimethylsulfoxide, NBS=N‐bromosuccinimide) as an oxidative system at ambient conditions. Additionally,
The chiral monoaza-15-crown-5 lariat ethers annellated to methyl-4,6-O-benzylidene-α-d-glucopyranoside-1 or mannopyranoside 2 have been applied as phase-transfercatalysts in the epoxidation of substituted chalcones and chalcone analogues with tert-butylhydroperoxide resulting in significant asymmetricinduction. It was found that the position of the substituents in the aromatic ring of the chalcone
Asymmetric Epoxidation of Enones Promoted by Dinuclear Magnesium Catalyst
作者:Joanna A. Jaszczewska‐Adamczak、Jacek Mlynarski
DOI:10.1002/adsc.202100482
日期:2021.9.7
still a challenging task. In this perspective, we present the application of chiral dinuclear magnesium complexes for asymmetricepoxidation of a broad range of electron-deficient enones. We demonstrate that the in situ generated magnesium-ProPhenol complex affords enantioenriched oxiranes in high yields and with excellent enantioselectivities (up to 99% ee). Our extensive study verifies the literature