Stereoselective Synthesis of Polysubstituted Alkenes through a Phosphine-Mediated Three-Component System of Aldehydes, α-Halo Carbonyl Compounds, and Terminal Alkenes
作者:Da-Neng Liu、Shi-Kai Tian
DOI:10.1002/chem.200900177
日期:2009.4.27
mediate the one‐pot Wittig reaction of aldehydes with α‐halo carbonylcompounds for the synthesis of 1,2‐disubstituted and trisubstituted alkenes in an excellent stereoselective fashion. Furthermore, the first one‐pot, three‐component reaction of aldehydes, α‐halo acetates, and terminalalkenes has been developed in the presence of PPh3 to produce trisubstituted alkenes with excellent E selectivity (see
Reaktionen von vinylketonen mit stabilisierten phosphoniumyliden
作者:Hans Jürgen Bestmann、Andreas Groß
DOI:10.1016/s0040-4039(97)01043-5
日期:1997.7
Acylphosphoniumylids 1 react with vinylketones 2 under formation of 1-acyl-4-oxoylids 3. in the reaction of carboalkoxytriphenylphosphoranes 4 with 2 two reaction pathways occur. Ln polar solvents again a Michael-addition gives the phosphoranes 6, whereas in nonpolar solvents a quasimethathesis-reaction leads to acrylic esters 9 and the acylphosphoranes 1. By O-1(2) 3 and 6 are oxidized to give the tricarbonyl-compounds 10 resp. 11. (C) 1997 Published by Elsevier Science Ltd.
Formation of Four-Membered Rings Using the Intramolecular Wittig Reaction: Convenient Generation of Functionalised Butadienes
作者:R. Alan Aitken、Mark E. Balkovich、Hans Jürgen Bestmann、Oliver Clem、Scott E. Gibson、Thomas Röder