Enantioselective Synthesis of Tertiary Propargylic Alcohols under N-Heterocyclic Carbene Catalysis
作者:Eduardo Sánchez-Díez、Maitane Fernández、Uxue Uria、Efraim Reyes、Luisa Carrillo、Jose L. Vicario
DOI:10.1002/chem.201501044
日期:2015.6.1
A straightforward procedure to carry out the enantioselective benzoin reaction between aldehydes and ynones by employing a chiral N‐heterocyclic carbene (NHC) as catalyst was developed. Under the optimized reaction conditions, these ynones undergo a clean and selective 1,2‐addition with the catalytically generated Breslow intermediate, not observing any byproduct arising from competitive Stetter‐type
Kinetic resolution of fluorinated propargyl alcohols by lipase-catalyzed enantioselective transesterification
作者:Sung-Jin Ko、Jung Yun Lim、Nan Young Jeon、Keehoon Won、Deok-Chan Ha、Bum Tae Kim、Hyuk Lee
DOI:10.1016/j.tetasy.2009.03.041
日期:2009.6
In order to obtain optically active fluorinated propargyl alcohols, a lipase-catalyzedkineticresolution has been carried out. The effect of lipase types, organic solvents, reaction temperature, and acyl donors was examined in the lipase-catalyzed transesterification of 1,1,1-trifluoro-4-phenyl-3-butyn-2-ol. Various enantiomerically pure fluorinated propargyl alcohols have been successfully prepared
The present invention relates to certain thiazolopyrimidinone compounds, pharmaceutical compositions comprising such compounds, and methods of treatment using such compounds.
The invention lies particularly in novel compounds represented by the general formula;
in which Z means CF₃ CHF₂ CH₂F, CClF₂ CCl₂F, CHClF, CCl₃ C₂F₂ or a perfluoroalkyl group of 3 or more carbon atoms, m and n are same or different with each other and represent an integral of 1 - 20, which are ferroelectric and chiral smectic liquid crystals of a large spontaneous polarization, a high speed of response and a good orientation, and showing a liquid crystal phase of tristable state and an electoclinic effect to be used as an liquid crystal element superior in an image display response.