Cuts both ways: The title reaction consists of an addition/cyclization/dehydration sequence and affords the biologically important chiral 3,5‐diaryl‐5‐(trifluoromethyl)‐2‐isoxazolines 1 in excellent yields with high ee values. The flexibility of accessing either the S or R enantiomers of the products has been achieved by the appropriate choice of phase‐transfer catalyst (2).
A Copper-Catalyzed Reductive Defluorination of β-Trifluoromethylated Enones via Oxidative Homocoupling of Grignard Reagents
作者:Xiaoting Wu、Fang Xie、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1021/acs.orglett.8b00379
日期:2018.3.16
An efficient copper-catalyzed reductive defluorination of β-trifluoromethylated enones via an oxidative homocoupling of Grignard reagents is reported. The reaction proceeded smoothly with a wide range of substrates, including the ones bearing aromatic heterocycles, such as furyl and thienyl ring systems in high yields (80–92%, except one example) under mild conditions. This provides a practical method
An efficient one-pot method was developed for the construction of 3-acylindoles via oxidative rearrangement of 2-aminochalcones followed by intramolecular cyclization. The reaction was used to convert a variety of 2-aminochalcones into 3-acylindoles in moderate to high yields.
An efficient transition-metal-free hydrodefluorination reaction of trifluoromethyl alkenes for accessing gem-difluoroalkenes is developed. It was surprising to find that the phosphoryl anion is able to mediate the defluorination.
Selective and Controllable Defluorophosphination and Defluorophosphorylation of Trifluoromethylated Enones: An Auxiliary Function of the Carbonyl Group
the tunable defluorophosphination and defluorophosphorylation of trifluoromethylated enones with P(O)-containing compounds was demonstrated. Controlled replacement of one or two fluorine atoms in trifluoromethylated enones while maintaining high chemo- and stereoselectivity was achieved undermildconditions, thus enabling diversity-oriented synthesis of skeletally diverse organophosphorus libraries─(Z)-difluoro-1
证明了羰基在三氟甲基化烯酮与含 P(O) 化合物的可调去氟膦化和去氟磷酸化中的辅助功能。在温和条件下实现了三氟甲基化烯酮中一个或两个氟原子的可控取代,同时保持高化学选择性和立体选择性,从而实现骨架多样化有机磷库的多样性导向合成─( Z )-difluoro-1,3-dien - 1-亚膦酸基酯、(1 Z ,3 E )-4-phosphoryl-4-fluoro-buta-1,3-dien-1-yl 亚膦酸酯和 ( E )-4-phosphoryl-4-fluoro-1,3-but -3-en-1-ones─具有优良的官能团耐受性,产量高。