Intermolecular Mizoroki-Heck Reaction of Aliphatic Olefins with High Selectivity for Substitution at the Internal Position
作者:Liena Qin、Xinfeng Ren、Yunpeng Lu、Yongxin Li、Jianrong Steve Zhou
DOI:10.1002/anie.201201806
日期:2012.6.11
New ligand for old reaction: The title reaction of aryltriflates with aliphatic olefins leads to substitution at the internal position with high selectivity. The ratio of the desired isomer (shown in the scheme) to the sum of all other isomers is generally above 10:1. The key to success is the use of a ferrocene bisphosphine ligand (R= 1‐naphthyl). The reaction can be easily scaled up, and minor isomers
Homohalocyclization: Electrophilic Bromine-Induced Cyclizations of Cyclopropanes
作者:Christian Rösner、Ulrich Hennecke
DOI:10.1021/acs.orglett.5b01315
日期:2015.7.2
efficient method for the halocyclization of cyclopropanes has been developed. The cyclopropanes undergo a 1,3-addition reaction to form homohalocyclization products compared to conventional alkene halocyclizations. The reaction can be induced by various electrophilic halogenating agents including 1,3-dibromo-5,5-dimethylhydantoin and N-iodosuccinimide. In cyclopropane derivatives with a preexisting stereocenter
Regioselective Heck reaction of aliphatic olefins and aryl halides
作者:Liena Qin、Hajime Hirao、Jianrong (Steve) Zhou
DOI:10.1039/c3cc45911j
日期:——
A regioselective Heck reaction of aliphaticolefins and aryl bromides is realized at internal carbons of olefins. Methanol solvent promoted halide ionization from neutral arylpalladium halide complexes via hydrogen bonding, so as to create cationic aryl-Pd species for regioselective olefin insertion.
A facile electrochemical sulfonylative cycloetherification of linear unsaturated alcohols with sulfonyl hydrazides under mild conditions has been accomplished. This catalyst- and oxidant-free protocol proceeds via electro-oxidation, followed by radicaladdition, as well as an intramolecular oxygen nucleophilic process. This methodology is compatible with a broad substrate scope and good functional
Nitryl Radical‐Triggered Semipinacol‐Type Rearrangement, Lactonization, and Cycloetherification of Olefins
作者:Rahul Giri、Subrata Patra、Dmitry Katayev
DOI:10.1002/cctc.202201427
日期:2023.2.8
photoredox-catalyzed, operationally simple, and mild protocol to access multiple nitro-containing cyclic compounds that employs N-nitrosuccinimide as a bench-stable and non-metal-based nitrating reagent. The first nitryl radical-driven semipinacol rearrangement and cycloetherification reactions are described which allowed the direct construction of the Csp3−NO2 bond.
自由基硝化:在此,我们报告了一种光氧化还原催化、操作简单且温和的方案,以获取多种含硝基环状化合物,该化合物使用N -硝基琥珀酰亚胺作为稳定的非金属基硝化试剂。描述了第一个硝基自由基驱动的半频哪醇重排和环醚化反应,它们允许直接构建 C sp 3 -NO 2键。