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。
Pd/C-Catalyzed Direct α-Oxygenation
of 1,3-Dicarbonyl Compounds Using Molecular Oxygen
A hydroxyl group was readily and directly introduced into the α-position of a variety of β-dicarbonyl compounds by heterogeneous Pd/C-catalyzed oxygenation using molecular oxygen.
Design, Synthesis, Structure, and Dehydrogenation Reactivity of a Water-Soluble <i>o</i>-Iodoxybenzoic Acid Derivative Bearing a Trimethylammonium Group
作者:Li-Qian Cui、Zhi-Lei Dong、Kai Liu、Chi Zhang
DOI:10.1021/ol202777h
日期:2011.12.16
5-Trimethylammonio-1,3-dioxo-1,3-dihydro-1λ5-benzo[d][1,2]iodoxol-1-ol anion (AIBX 1a), an o-iodoxybenzoic acid (IBX) derivative having the trimethylammonium moiety on its phenyl ring, possesses very good solubility in water and distinct oxidative properties from IBX, which is demonstrated in the oxidation of various β-keto esters to the corresponding dehydrogenated products using water as cosolvent
Dye-sensitized photooxidation of enolictautomers of naphthalenones (5) gave hydroperoxynaphthalenones (6) and naphthols (7). Deoxygenation of 6 by triphenylphosphine gave hydroxynaphthalenones (8).
HYDROXYLATION OF BETA-DICARBONYLS WITH ZIRCONIUM CATALYSTS
申请人:CASALNUOVO ALBERT LOREN
公开号:US20080306259A1
公开(公告)日:2008-12-11
The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by *
comprising contacting a compound of Formula II
with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydropetoxides in the presence of a zirconium complex, wherein R
1
, R
2
and R
3
are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer
wherein J, R
6
and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.