Hypervalent iodine-mediated aminobromination of olefins in water
作者:Xue-Liang Wu、Guan-Wu Wang
DOI:10.1016/j.tet.2009.08.069
日期:2009.10
The PhI(OAc)2-catalyzed aminobromination of electron-deficient olefins has been achieved in pure water with TsNH2 and NBS as nitrogen and bromine sources, respectively. With a catalytic amount of PhI(OAc)2, various olefins including α,β-unsaturated ketones, cinnamates, and cinnamides could be aminobrominated efficiently, giving the vicinal bromoamines in good yields and high regio- and diastereoselectivities
Use of allylzinc halide as a source of halide: Differential addition of nucleophiles to Ts-aziridines and aldehydes under similar reaction conditions
作者:Rana Chatterjee、Satyajit Samanta、Anindita Mukherjee、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1016/j.tetlet.2018.12.027
日期:2019.1
halide under identical reaction conditions acts in different modes for different electrophiles. For Ts-aziridines the halide part of the allylic halide has been introduced as a nucleophile and for the carbonyl compounds the simple allylation reaction occurs. To the best of our knowledge this is the first report where the allylic zinc halide is the source of halide acting as nucleophile. The main advantages
Regioselective Ring-Opening Nucleophilic Addition of Aziridines through Photoredox Catalyst
作者:Hongnan Sun、Chao Yang、Run Lin、Wujiong Xia
DOI:10.1002/adsc.201400476
日期:2014.9.15
A mild and efficient procedure was developed for the regioselective ring‐opening nucleophilic addition reactions of aziridines viavisiblelightphotoredoxcatalysis, that provides a practical synthetic access to 1,2‐bifunctional compounds. Furthermore, the regioselective synthesis of non‐racemic amino ethers from chiral aziridine could also be achieved under mild conditions. Finally, a possible reaction
Titanium superoxide: a heterogeneous catalyst for anti-Markovnikov aminobromination of olefins
作者:Tanveer Mahamadali Shaikh、Pratibha U. Karabal、Gurunath Suryavanshi、Arumugam Sudalai
DOI:10.1016/j.tetlet.2009.03.169
日期:2009.6
A new facile procedure for the aminobromination of olefins in high yields has been described using p-toluene sulfonamide (p-TsNH2) and N-bromosuccinimide (NBS) as nitrogen and bromine sources, respectively, and titanium superoxide as a truly heterogeneous catalyst. The formation of anti-Markovnikov product exclusively in all the cases studied possibly proceeding through a free radical reaction pathway