A New Chemoselective Base-Mediated Protection/Deprotection Method for Aldehydes
作者:Darren J. Dixon、Mark S. Scott、Chris A. Luckhurst
DOI:10.1055/s-2003-42470
日期:——
wide range of aldehydes was efficiently protected as pyrrole carbinol derivatives by direct addition of lithium pyrrolate in THF at -78 °C. The protection is chemoselective towards aldehydes over ketones and the O-lithiated, O-protonated or O-silylated carbinols may be used to block the aldehyde from nucleophilic and basic reagents at low temperatures. Mild, basic deprotection using DBU, NaOMe or TBAF