Carbonylation of alkynols catalyzed by Pd(II)/2-PyPPh 2 dissolved in organic solvents and in ionic liquids: a facile entry to α-methylene γ- and δ-lactones
作者:Crestina S Consorti、Gunter Ebeling、Jaı̈rton Dupont
DOI:10.1016/s0040-4039(01)02309-7
日期:2002.1
The carbonylation of terminal 3-alkyn-1-ols and 1-alkyn-4-ols by Pd(OAc)(2) associated with 2-(diphenylphosphino)pyridine (2-PyPPh2) dissolved in organic solvents or in 1-n-butyl-3-methyl imidazolium ionic liquids affords quantitatively and selectively exo-alpha-methylene gamma- and delta-lactones, respectively. In the case of the reactions performed in ionic liquids (biphasic conditions), the lactones were isolated by simple distillation and the ionic catalyst solution can be reused. (C) 2002 Elsevier Science Ltd. All rights reserved.
BARBIER, MICHEL, HETEROCYCLES, 26,(1987) N 2, 421-425
作者:BARBIER, MICHEL
DOI:——
日期:——
Direct Access to 4-Substituted 3-Isochromanones by the pH Controlled Addition of Aldehydes