Catalytic Synthesis of Trifluoromethylated Allenes, Indenes, Chromenes, and Olefins from Propargylic Alcohols in HFIP
作者:Florent Noël、Vuk D. Vuković、Jing Yi、Edward Richmond、Pavle Kravljanac、Joseph Moran
DOI:10.1021/acs.joc.9b02398
日期:2019.12.20
A general method to access CF3-substituted allenesfrom propargylic alcohols under Lewis acid catalysis in 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as solvent is described. By tuning the reaction time and temperature, the obtained allenes rearrange to 1,3-biaryl-1-trifluoromethyl-1H-indenes. By tuning the structure of the propargylic alcohol substrates, a range of trifluoromethylated 2H-chromenes were
A ligand-free strategy for the copper-catalysed direct alkynylation of trifluoromethyl ketones
作者:Lei Wang、Ning Liu、Bin Dai、Xiaowei Ma、Lei Shi
DOI:10.1039/c4ra14322a
日期:——
A superbase-induced copper-catalyzed direct alkynylation method for trifluoromethyl ketones was developed without any additional ligand under mild conditions.
开发了一种超碱诱导的铜催化直接炔基化方法,适用于三氟甲基酮,在温和条件下无需额外配体。
Octahedral Ruthenium Complex with Exclusive Metal-Centered Chirality for Highly Effective Asymmetric Catalysis
A novel ruthenium catalyst is introduced which contains solely achiral ligands and acquires its chirality entirely from octahedral centrochirality. The configurationally stable catalyst is demonstrated to catalyze the alkynylation of trifluoromethyl ketones with very high enantioselectivity (up to >99% ee) at low catalyst loadings (down to 0.2 mol%).
Copper(I) Alkoxide-Catalyzed Alkynylation of Trifluoromethyl Ketones
作者:Rie Motoki、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1021/ol071003k
日期:2007.8.1
A general method for direct alkynylation of trifluoromethyl ketones was developed by using (CuOBu)-Bu-t-xantphos or phenanthroline complexes as catalysts. The ligands significantly enhanced the catalyst activity. In addition, KOTf, generated in the catalyst preparation step, exhibited some acceleration effects. A preliminary extension to a catalytic enantioselective CF3-substituted tertiary propargyl alcohol synthesis (up to 52% ee) is also described.