Convenient and Stereoselective Synthesis of Symmetrical (E)-Stilbenes via Homocoupling of 1,3-Dibenzylbenzotriazolium Bromides
作者:Xiaohui Xiao、Daqin Lin、Shuitian Tong、Hong Luo、Yinfeng He、Hailan Mo
DOI:10.1055/s-0030-1260814
日期:2011.7
Using NaH as the base and DMSO as the solvent, a series of symmetric (E)-stilbenes were prepared in good yields via the homocoupling of 1,3-dibenzylbenzotriazolium bromides at room temperature.
以 NaH 为碱基,DMSO 为溶剂,在室温下通过 1,3-二苄基苯并三唑溴化物的均偶联反应制备了一系列对称 (E)- 二苯乙烯,收率良好。
A convenient way for alkylation of amines using xanthate esters
作者:Kodipura P. Sukrutha、Toreshettahally R. Swaroop、Ramesh Preetham、Neratur K. Lokanath、Kanchugarakoppal S. Rangappa、Maralinganadoddi P. Sadashiva
DOI:10.1080/00397911.2021.1933037
日期:2021.8.3
Abstract N-alkylation of amines by the reaction with xanthate esters in the presence of acetic acid catalyst in ethanol is reported. Short reaction time, high yield, general applicability and environmentally benign nature are the noteworthy features of our protocol. The probable mechanism for the formation N-alkylation of amines is proposed.
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
Benzotriazole-Assisted Aromatic Ring Annulation: Efficient and General Syntheses of Polysubstituted Naphthalenes and Phenanthrenes
作者:Alan R. Katritzky、Guifen Zhang、Linghong Xie
DOI:10.1021/jo961597x
日期:1997.2.1
4-addition to alpha,beta-unsaturated aldehydes and ketones. Intramolecular cyclization of the products, induced by acetic acid-hydrobromic acid or polyphosphoric acid (PPA), followed by simultaneous dehydration and debenzotriazolylation furnishes a wide range of polysubstituted naphthalenes 7a-f and of phenanthrenes 9 and 11 in moderate to good yields in one-pot procedures. If compounds 1 are first lithiated
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.