Enantioselective 1,3-Dipolar (5+3) Cycloadditions of Oxidopyrylium Ylides and Vinylcyclopropanes toward 9-Oxabicyclononanes
作者:Yanfeng Gao、Yuanhao Mao、Zhiwei Miao
DOI:10.1021/acs.orglett.2c01037
日期:2022.4.29
We have developed an efficient and mild enantioselective palladium-catalyzed (5+3) cycloaddition of vinylcyclopropanes and oxidopyryliumylides generated in situ from benzopyranones, in the presence of a chiral PHOX ligand. These reactions afford various highly functionalized bridged oxa-[3.3.1]carbocycles with three stereogenic centers that are challenging to synthesize, in moderate to good yields
Quiniou,H.; Lozach,N., Bulletin de la Societe Chimique de France, 1963, p. 1171 - 1175
作者:Quiniou,H.、Lozach,N.
DOI:——
日期:——
Protic Ionic Liquid as Reagent, Catalyst, and Solvent: 1‐Methylimidazolium Thiocyanate
作者:Ivan A. Andreev、Nina K. Ratmanova、André U. Augustin、Olga A. Ivanova、Irina I. Levina、Victor N. Khrustalev、Daniel B. Werz、Igor V. Trushkov
DOI:10.1002/anie.202016593
日期:2021.3.29
ring‐opening of donor‐acceptorcyclopropanes. A wide variety of activated cyclopropanes were found to react with 1‐methylimidazolium thiocyanate under mild metal‐free conditions via unusual nitrogen attack of the ambident thiocyanate ion on the electrophilic center of the three‐membered ring affording pyrrolidine‐2‐thiones bearing donor and acceptor substituents at the C(5) and C(3) atoms, respectively