Synthesis of 6-Amino- and 6-Arylazoazulenes via Nucleophilic Aromatic Substitution and Their Reactivity and Properties
作者:Taku Shoji、Shuhei Sugiyama、Mutsumi Takeuchi、Akira Ohta、Ryuta Sekiguchi、Shunji Ito、Tomoaki Yatsu、Tetsuo Okujima、Masafumi Yasunami
DOI:10.1021/acs.joc.8b02648
日期:2019.2.1
The nucleophilic aromatic substitution (SNAr) reaction of diethyl 6-bromoazulene-1,3-dicarboxylate (1) with a variety of amines afforded the corresponding 6-aminoazulene derivatives 2a–2j in good-to-excellent yields. 6-Aminoazulene derivatives 3a–3f without the 1,3-diethoxycarbonyl functions were obtained by the deesterification of 2a–2f with 100% H3PO4. The reactivity of 6-aminoazulenes toward the
亲核芳族取代(S Ñ二乙基-6- bromoazulene -1,3-二羧酸酯(的AR)反应1)具有多种,得到相应的6- aminoazulene衍生物胺2A - 2J中良好至优异的产率。通过2a - 2f与100%H 3 PO 4的脱酯作用,获得了不具有1,3-二乙氧羰基官能团的6-氨基azulene衍生物3a - 3f。的朝向溴化,S 6-aminoazulenes反应Ñ Ar和钯催化的交叉偶联反应也澄清。6-芳基偶氮唑酮13a – 13c还通过1与芳基肼的S N Ar反应,然后在N 2 H 4的存在下用Pb(OAc)4氧化,制备了氯丁烷。通过单晶X射线结构分析,紫外/可见光谱,伏安分析,光谱电化学和理论计算揭示了6-氨基-和6-芳基偶氮唑的结构,光学和电化学性质。