Efficient copper-catalyzedtrifluoromethylation of aromatic iodides was achieved with TMSCF3 in the presence of trimethylborate. The Lewis acid was used to anchor the in situ generated trifluoromethyl anion and suppress its rapid decomposition. Broad applicability of the new trifluoromethylating reaction was demonstrated in the functionalization of different aromatic and heteroaromatic iodides.
A new catalytic approach to selective functionalization of the strong C−F bonds in polyfluorinated aliphatic esters and amides is reported, affording a diverse array of important partially fluorinated motifs through hydrodefluorination, defluoroalkylation, and defluoroalkenylation. Straightforward downstream chemistry towards fluorinated alcohols, amines and drug derivatives highlights the potential
Arenethiolate as a Dual Function Catalyst for Photocatalytic Defluoroalkylation and Hydrodefluorination of Trifluoromethyls
作者:Can Liu、Kang Li、Rui Shang
DOI:10.1021/acscatal.2c00592
日期:2022.4.1
a photocatalyst in photoredoxcatalysis, but we report herein that an arene thiolate with an appropriate substituent can be photoactivated under visible light to function as both a strongly reducing electron-donating redox catalyst and a HAT catalyst to enable catalytic C–F activation of trifluoromethyl substrates for selective hydrodefluorination and coupling with various alkenes in the presence of
已知硫醇在光氧化还原催化中充当与光催化剂协同作用的氢原子转移催化剂,但我们在本文中报道了具有适当取代基的芳烃硫醇盐可以在可见光下光活化,从而起到强还原性给电子氧化还原的作用催化剂和 HAT 催化剂能够催化 C-F 活化三氟甲基底物,用于选择性加氢脱氟并在甲酸盐存在下与各种烯烃偶联。这些反应证明了硫醇盐作为双功能光催化剂的前景广阔。该方法的合成效用通过适用的三氟甲基底物的广泛范围来证明,包括三氟甲基化(杂)芳烃、三氟乙酸盐和三氟乙酰胺,它们表现出高水平的化学选择性。
Aminoazanium of DABCO: An Amination Reagent for Alkyl and Aryl Pinacol Boronates
作者:Xingxing Liu、Qing Zhu、Du Chen、Lu Wang、Liqun Jin、Chao Liu
DOI:10.1002/anie.201913388
日期:2020.2.10
The aminoazanium of DABCO (H2 N-DABCO) has been developed as a general and practical amination reagent for the direct amination of alkyl and aryl pinacolboronates. This compound is stable and practical for use as a reagent. Various primary, secondary. and tertiary alkyl-Bpin and aryl-Bpin substrates were aminated to give the corresponding amine derivatives. The amination is stereospecific. The anti-Markovnikov