On the regioselectivity of Pd-catalyzed additions of organoboronic acids to unsymmetrical alkynes
作者:Nakjoon Kim、Ki Seong Kim、Aruna Kumar Gupta、Chang Ho Oh
DOI:10.1039/b316446b
日期:——
The Pd-catalyzed reaction of unsymmetrical alkynes with organoboronicacids gave a mixture of products and, whose ratios were controlled by the electronic as well as steric effects of the substrates.
Synthesis and Antiviral Evaluation of Novel Cyclopropyl Nucleosides, Phosphonate Nucleosides and Phosphonic Acid Nucleosides
作者:Chang Hyun Oh、Joon Hee Hong
DOI:10.1002/ardp.200600031
日期:2006.9
Novel phenyl‐branched cyclopropyl nucleosides, phosphonates, and phosphonicacidanalogues were designed and synthesized as potential antiviral agents. Coupling of the mesylate 10 with natural bases (U, T, C, A) and desilylation/hydrolysis afforded a series of novel cyclopropyl nucleosides 15–18. Phosphonate and phosphonicacid nucleosides 22–29 were also readily synthesized from the mesylate 21. The
We have achieved a convenient enantioselective synthesis of memantine analogues containing a chiral cyclopropane skeleton as a sigma-1 receptor agonist in 19-40% overall chemical yields from the corresponding 2-arylbut-2-ene-1,4-diols with moderate to excellent asymmetric yields via regioselective acetylation using porcine pancreas lipase, catalytic enantioselective Simmons-Smith reactions, and amidation in aqueous organic solvent. This synthetic route is more efficient and less expensive than conventional methods. (C) 2016 Elsevier Ltd. All rights reserved.