Brønsted acidic cellulose-PO3H: An efficient catalyst for the chemoselective synthesis of fructones and trans-esterification via condensation of acetoacetic esters with alcohols and diols
作者:Dhanaji R. Naikwadi、Amravati S. Singh、Ankush V. Biradar
DOI:10.1016/j.mcat.2021.111912
日期:2021.10
of phosphorus over the material. The synthesized solid acid catalyst was utilized for condensation of diols with acetoacetic esters in solvent-free conditions to synthesize fine chemicals. The present approach not only circumvented the one-step protection and other products but more fascinatingly provided trans-esterification of acetoacetic esters with diols and n-alcohols. The catalyst was successfully
reactivity of achiral and enantiomerically pure acylketene acetals are described. The key reactions of these substrates involve facile conjugate hydroboration and organolithium addition. Enantiomerically pure acylketene acetals were employed to generate a homochiral β-keto ketal through a highly diastereoselective lithium enolate quench. This β-keto ketal, which was also prepared through a desymmetrization
A one-pot two-step protocol for the synthesis of 2-acetyl-1H-pyrroles from N-propargylic β-enaminones was described. When treated with zincchloride in refluxing chloroform, N-propargylic β-enaminones produced in situ 2-methylene-2,3-dihydro-1,4-oxazepines, which, upon further refluxing in methanol with zincchloride, afforded 2-acetyl-1H-pyrroles. The process was found to be general for a wide variety
Silylenolether-Funktionalisierung, 3. Mitt. Regioselektive Acylierung von Trimethylsilylenolethern mit 2-Alkoxy-1,3-dioxolanen ? Synthese von ?- und ?-gesch�tzten Dicarbonylverbindungen
作者:Eyup Akg�n、Ulf Pindur
DOI:10.1007/bf00799167
日期:1984.5
Conjugate hydroboration-reduction and organolithium additions to acylketene acetals. Synthesis of monoprotected β-dicarbonyls