Synthesis of allylic sulfonic acids via regioselective Pd-catalyzed allylic substitutions of Na 2 SO 3
摘要:
Palladium-catalyzed allylic sulfonations of the linear allylic carbonates with sodium sulfite (Na2SO3) were accomplished under mild conditions. This method gave allylic sulfonic acids in good to excellent yields with high level of regioselectivities. (C) 2015 Elsevier Ltd. All rights reserved.
A highly regioselective palladium-catalyzedallylic alkylation of fluorobis(phenylsulfonyl)methane has been studied. Using different allylic carbonates, a variety of terminal mono-fluoromethylated compounds were achieved in 85–99% yields with high regioselectivities.
The use of sodium 2-aminobenzenethiolate in the enantioselective iridium catalyzed allylic substitution with a range of methyl allyl carbonates allows the concise synthesis of the branch-type products with both excellent regio- and enantioselectivities, which are functionalized N,S-containing allylic intermediates for the formation of chiral benzo-fused N,S-heterocycles.
Synthesis of Chiral Allylic Thioesters: Enantio- and Regioselective Iridium-Catalyzed Allylations of KSAc
作者:Ning Gao、Xiaoming Zhao
DOI:10.1002/ejoc.201201640
日期:2013.5
Chiral allylic thioesters were synthesized through a direct iridium-catalyzed asymmetric allylation of KSAc in the presence of KOAc. This strategy provided branched allylic thioesters in good yields with the high levels of enantioselectivity.
Carbon-Phosphorus Bond Formation by Enantioselective Palladium-Catalyzed Allylation of Diphenylphosphine Oxide
作者:Liang Zhang、Wei Liu、Xiaoming Zhao
DOI:10.1002/ejoc.201403024
日期:2014.11
The enantioselective Pd-catalyzed allylation of diaryl-substituted allylic carbonates and diphenylphosphineoxide was investigated. This method gave allylic diphenylphosphineoxides in yields up to 95 % with 97 % ee. Pd-catalyzed allylation of (E)-methyl allyl carbonates with diisopropyl phosphonate was also examined.
Iridium-catalyzed direct asymmetric vinylogous allylic alkylation
作者:Chang-Yun Shi、Jun-Zhao Xiao、Liang Yin
DOI:10.1039/c8cc07249c
日期:——
alkylation of α,β-unsaturated lactones (including coumarins) was achieved with excellent regio- and enantioselectivity. Transformations of the product were carried out by means of the versatile terminal olefin and lactonemoieties. The synthetic application of the present methodology was showcased by the asymmetric synthesis of an advanced synthetic Merck intermediate toward a new drug candidate.