Nickel mediated flash isomerization: A new approach to 1,4-but-1-ene diol derivatives
作者:Corrado Malanga、Andrea Urso、Luciano Lardicci
DOI:10.1016/0040-4039(94)02414-7
日期:1995.2
Fast isomerization of cis 1,4-but-2-endiol derivatives (1) to 1,4-but-1-endiol derivatives (2) was carried out in mild conditions. The activity of the proposed Ni-hydride species is closely correlated with the nature of the protecting groups of the alcoholic functions of 1, which are also responsible for the regio and stereo chemical aspects of the reaction.
Nickel mediated double bond formation from vic-dibromides and ethyl magnesium bromide
作者:Corrado Malanga、Laura A. Aronica、Luciano Lardicci
DOI:10.1016/0040-4039(95)01988-t
日期:1995.12
vic-dibromides are quantitatively convened into alkenes by using a catalytic amount of NidppeCl2, in the presence of two molar equivalents of EtMgBr in THF. Stereochemical aspects of the reaction are given.
A modular approach to the synthesis of 2,3,4-trisubstituted tetrahydrofurans
作者:Christopher G. Nasveschuk、Nathan T. Jui、Tomislav Rovis
DOI:10.1039/b605438b
日期:——
A highly diastereoselective Lewis acid-mediated [1,3] rearrangement of 1,3-dioxepins is the key step along a modular route to 2,3,4-trisubstituted tetrahydrofurans.
Stereochemistry of hexachlorocyclopentadiene [4+2]-cycloaddition to 2-substituted 4,7-dihydro-1,3-dioxepins
作者:Roman S. Pavelyev、Ruzalia M. Vafina、Olga A. Lodochnikova、Albina S. Galiullina、Ekaterina I. Romanova、Konstantin V. Balakin、Yurii G. Shtyrlin
DOI:10.1016/j.tetlet.2016.07.023
日期:2016.8
Experimental investigation of hexachlorocyclopentadiene [4+2]-cycloaddition to 2-substituted 4,7-dihydro-1,3-dioxepins revealed an atypical stereochemical effect. Clear experimental evidence was obtained that more bulky C2 substituents favour the thermodynamically and sterically less favourable endo-isomers. The possible reasons for such behaviour are secondary interactions of the highest occupied