CuI/TMEDA-Catalyzed Annulation of 2-Bromo Alkynylbenzenes with Na2S: Synthesis of Benzo[b]thiophenes
摘要:
A copper-catalyzed thiolation annulation reaction of 2-bromo alkynylbenzenes with sodium sulfide has been developed. In the presence of CuI and TMEDA, a variety of 2-substituted benzo[b]thiophenes were readily prepared in moderate to good yields by the reaction of 2-bromo alkynylbenzenes and Na2S center dot 9H(2)O.
We have developed visible-light-induced trans-hydroboration of diarylalkynes via direct photoexcitation of in-situ-generated diboron complexes, affording previously elusive (E)-1,2-diaryl-vinylboronates with high stereoselectivity. Experimental, spectroscopic, and theoretical mechanistic studies revealed that the triplet-state boratecomplex facilitates B–B bond cleavage and the desired C–B bond formation
我们通过原位生成的二硼配合物的直接光激发,开发了可见光诱导的二芳基炔的反式硼氢化,提供了以前难以捉摸的具有高立体选择性的( E )-1,2-二芳基-乙烯基硼酸酯。实验、光谱和理论机理研究表明,三重态硼酸盐配合物促进 B-B 键断裂和所需的 C-B 键形成。该方法不需要任何催化剂并且操作简单。高度硼酸化的1,2-二芳基烯烃[1-(2-硼基苯基)乙烯基)硼酸酯]被证明可用作结构单元。