One-Pot Synthesis of Trisubstituted Triazenes from Grignard Reagents and Organic Azides
作者:Abdusalom A. Suleymanov、Rosario Scopelliti、Farzaneh Fadaei Tirani、Kay Severin
DOI:10.1021/acs.orglett.8b01214
日期:2018.6.1
and versatile method for the preparation of linear, trisubstituted triazenes is reported. The procedure is based on the reaction of Grignard reagents with 1-azido-4-iodobutane or 4-azidobutyl-4-methylbenzenesulfonate. These organic azides enable the regioselective formation of triazenes via an intramolecular cyclization step. The new method can be used for the preparation of aryl, heteroaryl, vinyl,
The palladium-catalyzedcross-couplingreaction of 1-aryltriazenes with aryl- and alkenyltrifluorosilanes occurs readily at room temperature to yield the corresponding biaryl and stilbene products in moderate to good yields. In contrast to the previous results for the reaction with areneboronic acids, in which an additional Lewis acid such as boron trifluoride is essential for the activation of the
The Base-Induced Fragmentation of N,N-Dibenzyl-N′-aryltriazenes
作者:Matthias E. P. Lormann、Stefan Dahmen、Frank Avemaria、Frank Lauterwasser、Stefan Bräse
DOI:10.1055/s-2002-31918
日期:——
on solid support, by a strong base (n-BuLi or LDA) leads to fragmentation of the N-N single bond to give an imine and a diazenyl anion, which decomposes by loss of nitrogen to the parent aryl anion. The imine is deprotonated to give a 2-aza allyl anion, which is subsequently trapped by electrophiles. As an overall result, this fragmentation of the Ti triazene anchoring group represents a new traceless
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。
NEW SYNTHESIS OF PHENYLTHIOGLYCOLIC ACIDS<i>via</i>RELATED TRIAZENE COMPOUNDS