Diverse opportunities: A Rhodium(III)‐catalyzed ortho‐selective olefination of arenes using a novel triazene as a directing group is reported. This method exhibits substantial post‐functionalization synthetic versatility, overcoming a vital limitation in CHactivation/functionalization products: restricted structural diversity.
General and Efficient Synthesis of Indoles through Triazene-Directed C-H Annulation
作者:Chengming Wang、Huan Sun、Yan Fang、Yong Huang
DOI:10.1002/anie.201301742
日期:2013.5.27
Unprotected indoles are prepared with the title method, which has a wide scope for alkynes. Excellent regioselectivity was accomplished for aryl–alkyl and alkyl–alkyl disubstituted acetylenes. This reaction features an unusual 1,2 rhodium migration and ring‐contraction‐triggered NN bond cleavage. It allows rapid conversion of the reaction products into several functional molecules.
A photo-promoted direct arylation of quinoxalin-2(1H)-ones with aryltriazenes under catalyst-free and ambient conditions was developed. The synthetic importance of this methodology was showcased by the simple operation, good functional group tolerance, gram-scale synthesis, and catalyst-free conditions.
在无催化剂和环境条件下,开发了一种光促进的 quinoxalin-2(1 H )-ones 与芳基三氮烯的直接芳基化反应。该方法的合成重要性通过简单的操作、良好的官能团耐受性、克级合成和无催化剂条件得到展示。