Aerobic oxidative α-iodination of carbonyl compounds using molecular iodine activated by a nitrate-based catalytic system
摘要:
The novel reaction system comprising air/NH4NO3(cat.)/I-2/H2SO4(cat.) is introduced as a simple, safe, cheap, efficient, and regioselective mediator for direct aerobic oxidative a-iodination of aryl, heteroaryl, alkyl, and cycloallcyl methyl ketones. The reaction system enabled the moderate to quantitative regioselective iodination of a large range of different methyl ketone derivatives including those bearing oxidizable heteroatom (S, N) substituents. Several activated aromatic compounds were also efficiently and selectively iodinated. The practical applicability of the presented reaction system was shown on 20 mmol scale under ambient pressure and 100% conversion of substrate was achieved. (C) 2014 Elsevier Ltd. All rights reserved.
Copper‐Catalyzed Enantioselective Cyano(Fluoro)Alkylation of Alkenes
作者:Muhammad Israr、Haigen Xiong、Yajun Li、Hongli Bao
DOI:10.1002/adsc.202000230
日期:2020.5.26
A copper‐catalyzed asymmetric cyano(fluoro)alkylation reaction of alkenes is reported. A range of chiral fluoroalkyl cyanides were obtained in high yields and excellent enantiomeric excess from readily available chemicals. The method uses fluoroalkyl iodides as the fluoroalkyl source and employs mild conditions. The peroxide LPO plays a significant role in promotion of this radical asymmetric reaction