Herein, we present a decarboxylative thiocarbonylation of aryl and alkenyl sulfonium salts with oxalic acid monothioethers (OAMs), which can be achieved by visible light-accelerated palladium catalysis. Sulfonium salts are widely available, and OAM is an easily accessible and stored reagent; this mild reaction method can also be used for the synthesis of different types of thioester compounds. The
Construction of Indole-Fused Seven- and Eight-Membered Azaheterocycles via a Tandem Pd/NBE-Catalyzed Decarbonylation and Dual C–H Activation Sequence
作者:Yu-Wen Liu、Meng-Meng Wang、Yun-Qian Zhang、Hui Xu、Hui-Xiong Dai
DOI:10.1021/acs.orglett.3c01579
日期:2023.7.28
Herein, we report the transformation of aromatic acids to indole-fused seven- and eight-membered azaheterocycles. Two C–C bonds are formed via the cleavage of one C–C bond and two C–H bonds. The incorporation of indole moieties into bioactive pharmaceuticals and natural products to construct a medium-sized polyfused heterocycle demonstrates the synthetic utility of the protocol.
Pd(OAc)2/phosphonium tetrafluoroborates efficiently catalyzed Fukuyama coupling reaction with p-tolyl thioesters and 3-ethoxy-3-oxopropylzinc bromide which provide γ-oxo carboxylicesters under mild conditions. Pd(OAc)2/PCy3·HBF4 is the most effective catalyst and provides a direct method for synthesizing functionalized γ-oxo esters with high efficiency from readily accessible carboxylicacids as starting materials