Enantioselective rhodium-catalysed insertion of trifluorodiazoethanes into tin hydrides
作者:Stephen Hyde、Janis Veliks、David M.H. Ascough、Robert Szpera、Robert S. Paton、Véronique Gouverneur
DOI:10.1016/j.tet.2018.11.022
日期:2019.1
insertion reactions with tinhydrides affording the corresponding α-(trifluoromethyl)benzyl stannanes. This reactivity contrasts with that of diazo esters which predominantly afford CH2 reduction products in the presence of tinhydrides. The first example of asymmetric insertion into tinhydrides using diazo compounds is also described. In addition, this system extends to asymmetric germanium hydride and
An I(I)/I(III) Catalysis Route to the Heptafluoroisopropyl Group: A Privileged Module in Contemporary Agrochemistry
作者:Ryan Gilmour、Víctor Martín-Heras、Constantin G. Daniliuc
DOI:10.1055/a-1485-4916
日期:2021.11
prominently in the current portfolio of leading insecticides. To reconcile the expansive potential of this module with the synthetic challenges associated with preparing crowded, fluorinated motifs, I(I)/I(III) catalysis has been leveraged. Predicated on in situ generation of p-TolIF2, this route enables the direct difluorination of α-trifluoromethyl-β-difluorostyrenes in a single operation. This formal addition
Synthesis of perfluoroalkyl-substituted arenes by oxidative desulfurization-fluorination
作者:Manabu Kuroboshi、Tamejiro Hiyama
DOI:10.1016/0022-1139(94)03139-8
日期:1994.11
Perfluoroalkyl-substitutedarenes have been readily synthesized from 2-aryl-2-perfluoroalkyl-1,3-dithiolanes by the action of an N-halo imide and HF/pyridine (or HF/melamine).
organocatalysts featuring SPhos- or BIDIME phosphine units have been developed and successfully applied in the asymmetric addition of nitromethane to N-Boc-protected trifluoromethyl aryl ketimines. α-Trifluoromethyl β-nitroamines were obtained in 40–82% isolated yields and 80–95% enantioselectivities. A careful evaluation of the catalytic activity of BIMPs indicates that the catalysts derived from the combination
The invention provides novel insecticidally useful fluorinated ethers of formula :
where Ar and Y are both substituted aryl groups, Z is a lower fluoroalkyl group (eg. trifluoromethyl), X' is hydrogen and X is hydrogen, halo, hydroxy, alkoxy or acyloxy, as well as the compounds where X and X' form a second bond between the adjacent carbon atoms. A typical example is 1,1,1-trifluoro-2-(4-ethoxyphenyl)-3-(4-fluoro-3-phenoxybenzyloxy)propane. The invention also provides novel intermediates for the preparation of the compounds including those of formulae ArCH(CF3)CH2OH, ArC(OH)(CF3)CH2OH, ArC(OH) (CF3)CH2Hal and