Long chain phenols. Part 17. The synthesis of 5-[(Z)-pentadec-8-enyl]resorcinol, ‘cardol monoene,’ and of 5-[(ZZ)-pentadec-8,11-dienyl]-resorcinol dimethyl ether, ‘cardol diene’ dimethyl ether
作者:Christopher J. Baylis、Stanley W. D. Odle、John H. P. Tyman
DOI:10.1039/p19810000132
日期:——
the bromide and alkylation of lithio-oct-1-yne gave 5-(pentadec-8-ynyl)resorcinol dimethyl ether which was selectively converted into the 8-(Z)-alkene. Demethylation with lithium iodide gave 5-[(Z)-pentadec-8-enyl]resorcinol which was identical to ‘cardol monoene’. Reaction of 7-(3,5-dimethoxyphenyl)heptyl bromide with the lithium derivative of OH-protected propargyl alcohol, gave after acidic treatment
Efficient procedures have been developed for the stereospecific reduction by alkali metals of disubstituted acetylenes with long carbon chains. Acetylenes containing two or more (isolated) triple bonds are reduced considerably more easily than are monoynes.
Die Strukturdynamik von Pentadienylmetall-Verbindungen mit endständiger Alkyl-Gruppe: zugleich «stereoselektive» und «stereodefensive» Synthese eines natürlichen Riechstoffes
作者:Herbert Bosshardt、Manfred Schlosser
DOI:10.1002/hlca.19800630832
日期:1980.12.10
Structural Dynamics of Pentadienyl Metal-Compounds Bearing a Terminal Alkyl Substituent: Both ‘Stereoselective’ and ‘Stereodefensive’ Synthesis of a Natural Perfume.
Ligand-Switchable Directing Effects of Tethered Alkenes in Nickel-Catalyzed Additions to Alkynes
作者:Karen M. Miller、Timothy F. Jamison
DOI:10.1021/ja0446799
日期:2004.12.1
Nickel-catalyzed reductive couplings of aldehydes with alkynes that contain tethered olefins are described, in which the degree and sense of regioselectivity are controlled by the length of the tether and the presence or absence of an additive. When the alkyne and alkene are separated by four bonds, very high (>95:5) regioselectivities are observed. Use of a monodentate phosphine as an additive leads
A series of 1,4-enynes was prepared and the compounds metalated with butyllithium in ether. The formation of the mono- and dilithio derivatives was studied by PMR and UV. Protonation of the dilithio compounds gave vinylallenes, 1,3- and 1,4-enynes. Isomerisation of the 1,4-enynes in DMSO using dimsylsodium gave vinylacetylenes from compounds containing a terminal double bond and vinylallenes from those