Hörner–Wadsworth–Emmons reagents 3 and ketones 2 with a perfluoroalkyl (Rf) moiety prepared in situ was proved to be significantly efficient and powerful methods for the construction of a wide variety of α,β-unsaturatedesters with Rf and R1 groups both at the β-position due to convenient avoidance of usually tedious as well as troublesome isolation steps of these ketones 2.
Photoinduced radical perfluoroalkylation of various simple electron-deficient olefins was achieved in the presence of an aqueous Na2S2O3 solution. The reactions proceeded smoothly to give addition or addition–elimination products. The ability of the products to be used as radical precursors or Michael acceptors was also demonstrated.
在Na 2 S 2 O 3水溶液的存在下,实现了各种简单的缺电子烯烃的光诱导自由基全氟烷基化。反应进行顺利,得到加成或加成消除产物。还证明了该产品用作自由基前体或迈克尔受体的能力。
Enantioselective Synthesis of Highly Substituted Fluoroalkylated Benzopyranones and 3-Coumaranones via <i>N</i>-Heterocyclic Carbene-Catalyzed Intramolecular Annulations
A highly enantioselective intramolecular NHC-catalyzed approach for the synthesis of fluoroalkylated benzopyranones and 3-coumaranones with all-carbon quaternary stereocenters is presented. This reaction is catalyzed by N-heterocyclic carbenes (NHCs) and involves annulation reactions between in situ generated acyl anion intermediates and highly substituted trifluoromethyl-β,β-disubstituted Michael