A new approach has been established for Rh(iii)-catalyzed direct aza oxidative cyclization of non-prefunctionalized azobenzenes to provide 2-aryl-2H-benzotriazoles in good yields.
Anil-Synthese. 10. Mitteilung. Über die Darstellung von Styryl-Derivaten des Dibenzofurans
作者:Jacques Garmatter、Adolf Emil Siegrist
DOI:10.1002/hlca.19740570402
日期:1974.4.27
Schiff'sche Basen des Dibenzofuran-2- bzw. -3-carbaldehydes mit p-Chloranilin können mit p-tolyl-substituierten heterocyclischen und carbocyclischen Aromaten in Gegenwart von Dimethylformamid und Kaliumhydroxid bzw. Kalium-t-butylat in die entsprechenden Styryl-Derivate übergeführt werden (« Anil-Synthese »).
希夫“血清胆碱酯酶倍欣DES二苯并呋喃-2- bzw. 在Gegenwart von Dimethylformamid和Kaliumhydroxid bzw中的-3-甲醛与对氯苯胺(Chloranilinkönnen)与对甲苯基取代的杂环和碳环的芳香化合物。Entsprechenden苯乙烯-衍生物übergeführtwerden(«Anil-Synthese»)中的叔丁基钾。
Copper-Catalyzed Cascade Cyclization Reaction of 2-Haloaryltriazenes and Sodium Azide: Selective Synthesis of 2 <i>H</i>-Benzotriazoles in Water
A new approach to the synthesis of 2 H‐benzotriazoles is described. This strategy is based on the copper‐catalyzed CN coupling of 2‐haloaryltriazenes or 2‐haloazo compounds with sodium azide and the intramolecular addition of nitrene to NN bonds. This approach allows the synthesis of various N‐amino‐ and N‐aryl‐2 H‐benzotriazoles in water, in good to excellent yields. The procedure is simple and
There are disclosed compound of Formula (I) or (II) wherein A
1
, A
2
, A
3
, A
4
and A
5
, which may be the same or different, represent N or CR
1
, R
9
represents -L-R
3
, in which L is a single bond or a linker group and R
3
represents hydrogen or a substituent and in addition, when an adjacent pair of A
1
-A
4
each represent CR
1
, then the adjacent carbon atoms, together with their substituents may form a ring B, when A
5
represents CR
1
, then A
5
and N—R
9
, together with their substituents may form a ring C, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the therapeutic and/or prophylactic treatment of Duchenne muscular dystrophy, Becker muscular dystrophy or cachexia.
Molybdenum-catalyzed deoxygenative heterocyclization of 2-nitroazobenzenes: a novel strategy for catalytic synthesis of 2-aryl-2<i>H</i>-benzo[<i>d</i>][1,2,3]triazoles
A novel strategy for the catalytic synthesis of 2-aryl-2H-benzo[d][1,2,3]triazoles bearing a wide range of functional groups in good to excellent yields by non-noble molybdenum-catalyzed deoxygenative heterocyclization of 2-nitroazobenzenes is described. The salient features of the transformation include the use of readily available substrates, valuable products and ease of scale-up. The mechanistic
一种通过非贵重钼催化的2的脱氧杂环化催化合成具有多种官能团的2-芳基-2H-苯并[ d ][1,2,3]三唑的新策略,收率良好至优异描述了-硝基偶氮苯。该转化的显着特点包括使用现成的底物、有价值的产品和易于扩大规模。机理研究表明该反应是通过Mo( VI )/Mo( IV )催化循环从2-硝基偶氮苯进行双重脱氧,形成2-芳基-2H-苯并[ d ][1,2,3 ]三唑-N 1 -氧化物或氮烯中间体。