corresponding Mannich products by various dimethyl(methylene)ammonium salts under a range of reaction conditions. The several methods used to form these derivatives are compared. Excellent approaches to aldehyde derivatives involve treating the enol silyl ether of the carbonyl compound with methyllithium and then an iminium salt, or directly adding the iminium salt to the enol silyl ether. Ketones may be
The reaction of aldehyde enol silyl ethers with lead(IV) acetate
作者:George M. Rubottom、Roberto Marrero、John M. Gruber
DOI:10.1016/s0040-4020(01)88584-7
日期:1983.1
The treatment of aldehydeenol silyl ethers 1 with lead(IV) acetate (LTA) using methylene chloride as solvent gives rise to the production of ⇌-acetoxy aldehydes 2 and glycolic ester derivatives 3 or enals 5. Structural variations in 1 are used to explain the divergent trends. When 1 is treated with LTA/KOAc/AcOH, high yields of the corresponding ⇌-acetoxy aldehydes 2 are obtained with the formation
Photocatalytic Synthesis of Acetals and Ketals from Aldehydes and Silylenolethers without the Use of Acids
作者:Desirée Steuernagel、Hans‐Achim Wagenknecht
DOI:10.1002/chem.202203767
日期:2023.3
Use light instead of acids: Silylenolethers derived from aldehydes and ketones as well as aldehydes themselves react efficiently to give acetals in good to excellent yields. The substrate range with respect to both aldehydes and alcohols is broad, and acid- and hydrogen-labile protecting groups are tolerated.