Construction of 3-aryl-1,2,4-benzotriazines via unprecedented rearrangement of bis(benzotriazol-1-yl)methylarenes
作者:Zhiyun Zhong、Ran Hong、Xiaoxia Wang
DOI:10.1016/j.tetlet.2010.10.093
日期:2010.12
3-Aryl-1,2,4-benzotriazines were formed unexpectedly by the treatment of 1,l-bis(benzotriazol-1-yl) methylarenes with allylsamarium bromide. A radical pathway was proposed involving steps, such as fragmentation, ring-opening, and cyclization. (C) 2010 Elsevier Ltd. All rights reserved.
Reactivity of AllylSmBr/HMPA: Facile Synthesis of 3-Aryl-1,2,4-benzotriazines
作者:Ruifeng Yin、Liejin Zhou、Huili Liu、Hui Mao、Xin Lü、Xiaoxia Wang
DOI:10.1002/cjoc.201200989
日期:2013.1
3‐Aryl‐1,2,4‐benzotriazines were conveniently prepared in moderate to good yields from 1,l‐bis(benzotriazol‐1‐yl)methylarenes with allylsamarium bromide/hexamethylphosphramide (allylSmBr/HMPA). Preliminary results indicate that HMPA may enhance the reducing ability as well as prohibit the nucleophicility of allylSmBr, thus making allylSmBr/HMPA as a promising single‐electron transfer (SET) reagent
Palladium-Catalyzed Regioselective ortho-Acetoxylation of 3-Aryl-1,2,4-Benzotriazines via C-H Activation
作者:Guosheng Huang、Xiaoyu Ren、Jin Liu、Hao Yan、Xiaokang Shi、Sizhuo Yang、Jian Li
DOI:10.1055/s-0033-1338702
日期:——
A highly regioselectiveortho-acetoxylation has been achieved in the presence of 10 mol% Pd(OAc)2 and a stoichiometric amount of PhI(OAc)2 in a mixture of acetic anhydride and acetic acid via C–H activation to produce the corresponding acetoxy-substituted 3-aryl-1,2,4-benzotriazines derivatives in good yields.