[reaction: see text] The addition of aryl- and heteroarylboronic acids to azocompounds is described. Copper salt catalysis was necessary to perform the reaction under mild conditions and high yields. Excellent regioselectivity was observed in addition to unsymmetricalazocompounds.
Copper Salt Catalyzed Coupling of Organobismuth Reagents and Azo Compounds
作者:Uno Mäeorg、Olga Tšubrik、Ksenija Kisseljova
DOI:10.1055/s-2006-950408
日期:2006.9
A new copper salt catalyzed C-N coupling is described. This smooth reaction between azo compounds and organobismuth reagents provides efficient and highly regioselective access to Boc-protected aryl hydrazines. The yields under optimized conditions are mostly excellent and the synthetic procedure is robust and simple.
Diaza [1,4] Wittig-type rearrangement of N-allylic-N-Boc-hydrazines into γ-amino-N-Boc-enamines
作者:Eiji Tayama、Yoshiaki Kobayashi、Yuka Toma
DOI:10.1039/c6cc04626f
日期:——
Diaza [1,4] Wittig-type rearrangement of N-allylic-N-Boc-hydrazines into [small alpha]-amino-N-Boc-enamines was demonstrated. The scope and limitation, experimental mechanistic studies, and a proposed reaction mechanism were also described.
A facile method to synthesize azo compounds from hydrazine derivatives is developed. This represents the unprecedented example of Selectfluor-mediated oxidative dehydrogenation of hydrazine derivatives. The reaction might proceed through N-fluorination and elimination processes. This protocol exhibits key features including simple operation, mild conditions, good functional group tolerance, and high
开发了一种从肼衍生物合成偶氮化合物的简便方法。这代表了 Selectfluor 介导的肼衍生物氧化脱氢的史无前例的例子。该反应可能通过 N-氟化和消除过程进行。该协议具有操作简单、条件温和、官能团耐受性好、效率高等特点。此外,磺酰基取代的偶氮化合物在 4 W 蓝色 LED 照射下以优异的产率转化为乙酰苯胺也突出了该优势。
Copper(<scp>ii</scp>)-catalyzed coupling reaction: an efficient and regioselective approach to N′,N′-diaryl acylhydrazines
作者:Ji-Quan Zhang、Gong-Bin Huang、Jiang Weng、Gui Lu、Albert S. C. Chan
DOI:10.1039/c4ob02343a
日期:——
An efficient and regioselective copper(ii)-catalyzed coupling reaction of N′-aryl acylhydrazines for the synthesis of N′,N′-diaryl acylhydrazines has been developed.