The hetero Diels–Alder reactions of masked o-benzoquinones with nitroso compounds
作者:Ken-Ching Lin、Chun-Chen Liao
DOI:10.1039/b103649c
日期:——
The first examples of hetero Diels-Alderreaction of masked o-benzoquinones with nitroso dienophiles leading to novel and highly functionalized heterocycles, which are potential intermediates for nitrogenous natural products are reported.
A Mild<i>meta</i>-Selective C-H Alkylation of Catechol Mono-Ethers
作者:Edon Vitaku、Jon T. Njardarson
DOI:10.1002/ejoc.201600760
日期:2016.8
report a mild meta-selective C–H alkylation of these phenols, which is enabled by a cascade of oxidative dearomatization – radical addition– rearomatization process. The method is compatible with reactive functional groups on the parent arenol, such as olefins and halides. Primary, secondary, and teriary alkyl groups can be used, the source of which is most commonly an alkylborane. This process is operationally
An Active Catalyst for Diels-Alder Reaction of Indol with o-Benzoquinone
作者:S. Sedaghat、A. Zein
DOI:10.14233/ajchem.2017.20427
日期:——
The Diels-Alder reaction of indol with masked o-benzoquinone was studied. The stereo selectivity of this reaction by heterogeneous catalysis is improved. This catalyst was prepared by surface modification of nanoporous silica gel with cerium ion in aqueous ammonia. The structures of products were characterized by spectroscopic techniques.
Oxidative cycloaddition of hydroxamic acids with dienes or guaiacols mediated by iodine(III) reagents
作者:Hisato Shimizu、Akira Yoshimura、Keiichi Noguchi、Victor N Nemykin、Viktor V Zhdankin、Akio Saito
DOI:10.3762/bjoc.14.39
日期:——
[Bis(trifluoroacetoxy)iodo]benzene (BTI) and (diacetoxyiodo)benzene (DIB) efficiently promote the formation of acylnitroso species from hydroxamic acids in the presence of various dienes to give the corresponding hetero-Diels-Alder (HDA) adducts in moderate to high yields. The present method could be applied to the HDA reactions of acylnitroso species with o-benzoquinones generated by the oxidative dearomatization
Studies on photochemical rearrangement of non‐oxygenated bicyclo[2.2.2]octenones and mono‐oxygenated bicyclo[2.2.2]octenones from masked<i>o</i>‐benzoquinones: Access to protoilludane and marasmane skeletons
作者:Wei‐Chun Hung、Yung‐Ching Chen、Guang‐Hao Niu、Gary J. Chuang
DOI:10.1002/jccs.201900460
日期:2020.3
described flexible approaches to protoilludane‐like (5,6,4‐tricyclic ring) and marasmane‐like (5,6,3‐tricyclic ring) skeletons with naturally occurring cis/anti/cis stereochemistry using photochemicalrearrangement of bicyclo[2.2.2]octenones and Diels‐Alder reaction of masked o‐benzoquinones as the key steps.