Organic synthesis via magnetic attraction: benign and sustainable protocols using magnetic nanoferrites
作者:R. B. Nasir Baig、Rajender S. Varma
DOI:10.1039/c2gc36455g
日期:——
Magnetic nano-catalysts have been prepared using simple modification of iron ferrites. The nm size range of these particles facilitates the catalysis process, as an increased surface area is available for the reaction; the easy separation of the catalysts by an external magnet and their recovery and reuse are additional beneficial attributes. Glutathione bearing nano-ferrites have been used as organocatalysts for the Paal–Knorr reaction and homocoupling of boronic acids. Nanoferrites, post-synthetically modified by ligands, were used to immobilize nanometals (Cu, Pd, Ru, etc.) which enabled the development of efficient, sustainable and green procedures for azide–alkynes-cycloaddition (AAC) reactions, C–S coupling, O-allylation of phenol, Heck-type reactions and hydration of nitriles.
Practical regioselective synthetic method for (E)-enol ether
作者:Hyeung-geun Park、Dong-Hwa Kim、Misuk You、Mi-kyoung Park、Sang-sup Jew
DOI:10.1016/s0040-4039(00)00603-1
日期:2000.6
A new practical and highly regioselective synthetic method for (E)-enol ether is reported. (E)-enol ethers (E:Z=93:7–99:1) were prepared from the corresponding enolacetates (E:Z≅3:1) in two steps by bromination and anti-elimination of α-bromodialkylacetal via metal halogen exchange.