Asymmetric Olefin Isomerization of Butenolides via Proton Transfer Catalysis by an Organic Molecule
作者:Yongwei Wu、Ravi P. Singh、Li Deng
DOI:10.1021/ja205674x
日期:2011.8.17
general olefin isomerization was realized via biomimetic protontransfer catalysis with a new chiral organic catalyst. A broad range of mono- and disubstituted β,γ-unsaturated butenolides were transformed into the corresponding chiral α,β-unsaturated butenolides in high enantioselectivity and yield in the presence of as low as 0.5 mol % catalyst. Mechanistic studies have revealed the protonation as the
A new method for the preparation of 3,5-disubstituted butenolides
作者:Stephen L. Buchwald、Qun Fang、Susan M. King
DOI:10.1016/0040-4039(88)85185-2
日期:1988.1
A convenient method for the transformation of suitably protected propargyl alcohols into 3,5disubstiuted butenolides has been developed. This organozirconium-based method transforms optically active propargyl alcohols into the corresponding butenolides with no loss of optical activity.
Convenient Synthesis of Volatile<i>Streptomyces</i>Lactones
作者:Santosh G. Tilve、Chandan P. Amonkar、P. S. Parameswaran
DOI:10.1055/s-2005-870025
日期:——
A convenient three-step synthetic approach towards 3-alkyl-5-methyl-2[5H]furanones is described. The steps involved in the synthesis are domino primary alcohol oxidation-Wittig reaction, acid-catalysed lactonisation and isomerisation. This synthetic approach has been exploited to synthesise four Streptomyces lactones.
The present invention relates to a biaryl heterocycle substituted oxazolidinone antibacterials shown by general formula (I), a pharmaceutically acceptable salt thereof, an isomer or a prodrug thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, A and B are as defined in the description. The present invention further relates to a method for preparing the compound, a pharmaceutical composition and a pharmaceutical formulation comprising the compound, and a use of the compound in the manufacture of a medicament for the treatment and/or prevention of infectious diseases and a use for the treatment and/or prevention of infectious diseases.
An asymmetric isomerization of β,γ-unsaturated butenolides with a newly developed betaine catalyst at a 0.2–2 mol% loading, an improvement upon available methods that use 0.5–2.0 mol% catalyst.