Chemoselective acylation of some oxidofunctionalised organolithium compounds
作者:Miguel Yus、Joaquı́n Gomis
DOI:10.1016/s0040-4020(03)00758-0
日期:2003.6
Once oxidofunctionalised organolithium compounds 1 (easily prepared by reductive ring opening of isochroman and phthalan by DTBB-catalysedlithiation) were transmetallated with ZnBr2/CuCN·2LiCl and reacted successively with a carboxylic acid anhydride and an acyl chloride in THF at 0°C, the corresponding differently acylated compounds 4 were obtained after hydrolysis with water. The anhydride performed
Reductive Ring Opening of Oxygen-Containing Benzo-Fused Heterocycles by an Arene-Catalysed Lithiation
作者:Miguel Yus、Benjamín Moreno、Francisco Foubelo
DOI:10.1055/s-2004-815971
日期:——
The reductive ring opening of phthalan and isochroman in a 8 mmol scale process, using a small excess of lithium (1.35 equiv) and a substoichiometric amount of DTBB (3 mol%), leads to functionalised organolithium compounds, which after reaction with (-)-menthone as electrophile followed by hydrolysis with water, gives the corresponding diols in good yields with high stereoselectivity. Dehydration of these diols leads to the corresponding oxygen-containing heterocycles, which are homologous of the starting heterocycles.