A Simple and Effective Method for α-Hydroxylation of β-Dicarbonyl Compounds Using Oxone as an Oxidant without a Catalyst
作者:Jun Yu、Jian Cui、Chi Zhang
DOI:10.1002/ejoc.201000940
日期:2010.12
Oxone has been found to be a highly efficient reagent for the introduction of a hydroxy group at the α position of a variety of β-dicarbonylcompounds in the homogeneous solvent mixture of water and 1,4-dioxane at 60 °C.
已发现 Oxone 是一种高效试剂,可在 60 °C 下在水和 1,4-二恶烷的均相溶剂混合物中在各种 β-二羰基化合物的 α 位引入羟基。
Highly Efficient CH Hydroxylation of Carbonyl Compounds with Oxygen under Mild Conditions
作者:Yu-Feng Liang、Ning Jiao
DOI:10.1002/anie.201308698
日期:2014.1.7
A transition‐metal‐free Cs2CO3‐catalyzed α‐hydroxylation of carbonylcompounds with O2 as the oxygen source is described. This reaction provides an efficient approach to tertiary α‐hydroxycarbonyl compounds, which are highly valued chemicals and widely used in the chemical and pharmaceutical industry. The simple conditions and the use of molecular oxygen as both the oxidant and the oxygen source make
描述了无过渡金属的Cs 2 CO 3催化的羰基化合物的α-羟基化,其中O 2为氧源。该反应为叔α-羟基羰基化合物提供了一种有效的方法,这些叔α-羟基羰基化合物是极有价值的化学物质,广泛用于化学和制药行业。简单的条件和使用分子氧作为氧化剂和氧源使该协议非常环保和实用。此转换是高效的,并且对叔C(sp 3)H键裂解具有高度选择性。
Enzymatic Chemoselective Aldehyde-Ketone Cross-Couplings through the Polarity Reversal of Methylacetoin
作者:Giovanni Bernacchia、Olga Bortolini、Morena De Bastiani、Lindomar Alberto Lerin、Sabrina Loschonsky、Alessandro Massi、Michael Müller、Pier Paolo Giovannini
DOI:10.1002/anie.201502102
日期:2015.6.8
α‐hydroxy ketones through the rare aldehyde–ketone cross‐carboligation reaction. Unprecedented is the use of methylacetoin as the acetyl anion donor in combination with a range of strongly to weakly activated ketones. In some cases, Ao:DCPIP OR produced the desired tertiary alcohols with stereochemistry opposite to that obtained with other ThDP‐dependent enzymes. The combination of methylacetoin as acyl anion
Universal remedy: The α‐hydroxylation of β‐keto esters and a range of other suitably substituted carbonyl compounds can be effected in the presence of IBX (2‐iodoxybenzoic acid). This novel reactivity underscores the importance of IBX as a universally applicable oxidizing agent.
I<sub>2</sub>-Catalyzed Direct α-Hydroxylation of β-Dicarbonyl Compounds with Atmospheric Oxygen under Photoirradiation
作者:Chun-Bao Miao、Yan-Hong Wang、Meng-Lei Xing、Xin-Wei Lu、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1021/jo401866p
日期:2013.11.15
An I2-catalyzed hydroxylation of β-dicarbonyl moieties using air as the oxidant under photoirradiation has been developed for the easy preparation of α-hydroxy-β-dicarbonyl compounds. The transformation was completed with only 1 mol % of I2. With α-unsubstituted malonates, the hydroxylated dimerization product was afforded as the predominant product along with a minor product, α,α-dihydroxyl malonate