Collective Synthesis of 3-Acylindoles, Indole-3-carboxylic Esters, Indole-3-sulfinic Acids, and 3-(Methylsulfonyl)indoles from Free (N–H) Indoles via Common <i>N</i>-Indolyl Triethylborate
作者:Zhi-Wei Zhang、Hong Xue、Hailing Li、Huaiping Kang、Juan Feng、Aijun Lin、Shouxin Liu
DOI:10.1021/acs.orglett.6b01970
日期:2016.8.5
A general and direct C3 functionalization of free (N–H) indoles with readily available electrophiles such as acid chlorides, chloroformates, thionyl chloride, and methylsulfonyl chloride via a common N-indolyl triethylborate intermediate is reported. The reaction proceeds smoothly under mild conditions in up to 93% yield. Indoles with substituents at the C2, C4, C5, C6, and C7 positions are well tolerated
据报道,通过常见的N-吲哚基三乙基硼酸酯中间体,可以利用容易获得的亲电子试剂(如酰氯,氯甲酸酯,亚硫酰氯和甲基磺酰氯)对游离(NH)吲哚进行一般和直接的C3功能化。反应在温和条件下平稳进行,收率高达93%。在C2,C4,C5,C6和C7位置带有取代基的吲哚具有良好的耐受性。各种重要的3-acylindoles,吲哚-3-羧酸酯,吲哚-3-亚磺酸和3-(甲基磺酰基)吲哚的易于获得证明了该方法的高度相容性和实用性。