The regio- and stereo-selectivities in the [2 + 2] photocycloaddition of a series of 1-benzoylindoles with vinyl acetate and methyl acrylate have been investigated. With some exceptions, the 1 -benzoylindoles gave exclusively or predominantly the corresponding 1-acetoxy-3-benzoyl and 3-benzoyl-1-methoxycarbonyl-1,2,2a,7b-tetrahydro-3H-cyclobut[b]indoles as mixtures of stereoisomers.
研究了一系列的1-苯甲酰基吲哚与乙酸乙烯酯和丙烯酸甲酯的[2 + 2]光环加成反应中的区域和立体选择性。除某些例外,1-苯甲酰基吲哚仅或主要以混合物形式提供相应的1-乙酰氧基-3-苯甲酰基和3-苯甲酰基-1-甲氧基羰基-1,2,2a,7b-四氢-3 H-环丁[ b ]吲哚立体异构体。
Oxidative functionalization of indoles is one of the most widely used approaches to exploit the synthetic utility of indoles. In continuation of our research interest in the green oxidation of indoles, we further explore the oxidation of indoles with oxone–halide and discover that the protecting group on the nitrogen of indoles plays a decisive role in controlling the pathways of indoleoxidation with
Dabco-catalysed selective chlorination of aromatics
作者:Jun Xu、Xue Li、Qiji Li、Weiyi Tian、Xiaosheng Yang
DOI:10.1016/j.tetlet.2024.154928
日期:2024.2
A Lewis base catalyst DABCO for highly efficient electrophilic aromatic chlorination using NCS was presented. The mild conditions, easy-availability and stability of the catalyst and reagents, as well as good functional-group tolerance, showed the approach to be a versatile protocol for the late-stage aromatic chlorination of complex natural products and drugs.