Synthesis of biaryls via intramolecular free radical ipso-substitution reactions
作者:Feroze Ujjainwalla、Maria Lucília E.N. da Mata、Andrew M.K. Pennell、Carmen Escolano、William B. Motherwell、Santiago Vázquez
DOI:10.1016/j.tet.2015.07.048
日期:2015.9
intramolecular freeradical [1,5]-ipso-substitution using sulfonamide and sulfonate derived tethering chains. The overall efficiency of the process is determined by appropriately positioned substituents on the aromatic acceptor ring. The extension of the process to benzylic sulfonates and their corresponding N-methylsulfonamide alternatives as substrates in potential [1,6]-ipso-substitution reactions leads
Metal-Free β-Amino Alcohol Synthesis: A Two-step Smiles Rearrangement
作者:Di Yang、Cai-Xia Xie、Xiao-Tian Wu、Luo-Ran Fei、Lei Feng、Chen Ma
DOI:10.1021/acs.joc.0c01543
日期:2020.12.4
A novel method for the synthesis of β-amino alcohols has been demonstrated under mild reaction conditions with a broad scope via a two-step Smiles rearrangement. What is more, theoretical calculations have been performed to confirm the rationality of the mechanism. The method has been proved to be notably effective for N-arylated amino alcohols, which are difficult to synthesize by traditional methods
A Pd‐catalyzed efficient reductive cross‐coupling reaction without metallic reductant to construct a Csp2Csp3 bond has been reported. A PdIV complex was proposed to be a key intermediate, which subsequently went through double oxidative addition and double reductive elimination to produce the cross‐coupling products by involving Pd0/II/IV in one transformation. The oxidative addition from PdII to
Deacetylative Aryl Migration of Diaryliodonium Salts with C(sp<sup>2</sup>)–N Bond Formation toward <i>ortho</i>-Iodo <i>N</i>-Aryl Sulfonamides
作者:Huangguan Chen、Limin Wang、Jianwei Han
DOI:10.1021/acs.orglett.0c01024
日期:2020.5.1
An unprecedented approach of metal-free C(sp2)-N bond formation via deacetylation/intramolecular aryl migration is demonstrated with novel N-sulfonamide substituted diaryliodonium salts. The reaction provides a variety of ortho-iodo N-aryl sulfonamides. The products were employed in several coupling reactions to afford useful diarylamine scaffolds. Furthermore, the key intermediates of zwitterionic