Synthesis and some spectral characteristics of bicyclic phosphate, GABA antagonists.
作者:Yoshihisa OZOE、Morifusa ETO
DOI:10.1271/bbb1961.46.411
日期:——
Bicyclic phosphates (BPs), GABA antagonists, were prepared by reaction of the corresponding triols with phosphoryl chloride. The triols were obtained by one of the following methods: (a) the Tollens condensation of an aldehyde possessing α-hydrogen atoms with formaldehyde; (b) the basecatalyzed hydroxymethylation of alkylmalonates or α-alkylacetoacetates with paraformaldehyde, followed by reduction; (c) the reduction of diethyl pivaloylmalonate; or (d) the halogenation of pentaerythritol. Some BPs were also derived by modification of the functional groups of BP homologs. The 1H-NMR spectra of 4-substituted BPs showed a characteristic doublet peak due to the endocyclic methylene protons, the shift position of which was affected by the electronic nature of the bridgehead substituent. The mass spectra of the PBs were characterized by peaks due to the loss of CH2O from the ring.
Metal-Containing Ionic Liquids as Efficient Catalysts for Hydroxymethylation in Water
作者:Katharina Bica、Peter Gaertner
DOI:10.1002/ejoc.200800323
日期:2008.7
The iron-containing ionicliquid butylmethylimidazolium tetrachloroferrate (bmim-FeCl4) proved to be an efficient and recyclable catalyst for the hydroxymethylation of β-keto esters using aqueous formaldehyde and a low catalyst loading of up to 0.1 mol-% without co-solvents or additional surfactants. An useful and high-yielding approach to hydroxymethylated keto esters as well as to 3-disubstitued
This study introduces a novel hydroxymethylation method using DMSO. A wide range of 1,3-dicarbonyls underwent hydroxymethylation efficiently to afford the corresponding hydroxylated products in yields ranging from 73 % to 98 % under basic conditions, with formaldehyde generated from DMSO decomposition catalyzed by oxalyl chloride and hydrochloric acid in 1,4-dioxane. This method offers a more efficient