Oxidation of Aliphatic 2,2‐Dichloroalkanals by HNO3 in CH2Cl2: An Easy and Eco‐friendly Route to the Corresponding 2,2‐Dichloroalkanoic Acids
摘要:
A simple, economically convenient, and eco-compatible procedure for the oxidation of 2,2-dichloroalkanals to the corresponding alkanoic acids has been set up, employing HNO3 in CH2Cl2, in the presence of NaNO2 as catalyst.
The enantioselective aminocatalytic α-chlorination of aldehydes is a challenging reaction because of its tendency to proceed through neutral intermediates in unselective pathways. Herein we report the rational shift to a highly selective reaction pathway involving charged intermediates using hexafluoroisopropanol as solvent. This change in mechanism has enabled us to match and improve upon the yields
Novel Boronic Acid Mannich Reactions of α,α-Dichloro- and α,α,ω-Trichloroaldehydes with Arylboronic Acids
作者:Kourosch Abbaspour Tehrani、Sara Stas
DOI:10.1055/s-2007-965880
日期:2007.2
A novel variation of the boronicacid Mannich (BAM) reaction is described, in which α,α-dichloro- and α,α,ω-trichloroal-dehydes, morpholine, and arylboronicacids are used. During this one-pot reaction in refluxing toluene, 1 -phenyl- 1-morpholinoalkan-2-ones form in moderate yields. The dichloromethylene group is formally converted into a ketone functionality and as such acts as a masked carbonyl