Anomeric oxygen to carbon rearrangements of alkynyl tributylstannane derivatives of furanyl (γ)- and pyranyl (δ)-lactols
作者:Marianne F. Buffet、Darren J. Dixon、Steven V. Ley、Dominic J. Reynolds、R. Ian Storer
DOI:10.1039/b316858a
日期:——
Tetrahydropyran and tetrahydrofuran containing natural products, drugs and agrochemicals often possess carbonâcarbon bonds adjacent to the heteroatom. Consequently, new methods for the construction of anomeric carbonâcarbon bonds are of considerable importance. We have devised a new strategy to access these systems that requires the treatment of O-glycoside alkynyl tributylstannane derivatives of furanyl and pyranyl lactols with Lewis acid to effect oxygen to carbon rearrangements. This leads to the formation of the corresponding carbon linked alkynol products that can be further manipulated to produce key structural motifs and building blocks for the assembly of complex molecules.
Surveying approaches to the formation of carbon–carbon bonds between a pyran and an adjacent ring
作者:Jeffrey D. Frein、Tomislav Rovis
DOI:10.1016/j.tet.2006.02.042
日期:2006.5
We have examined several methods for the stereoselective formation of carbon-carbonbonds between contiguous rings where a stereogenic center is already present. The approaches investigated were a [1,3] oxygen to carbon rearrangement of cyclic vinyl acetals, an intermolecular enolsilane addition into an in situ generated oxocarbenium ion, an intramolecular conjugate addition of tethered alkoxy enones
Diastereoselective oxygen to carbon rearrangements of anomerically linked enol ethers and the total synthesis of (+)-(S,S )-(cis-6-methyltetrahydropyran-2-yl)acetic acid, a component of civet
作者:Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1039/b001243m
日期:——
range of enol ethers, linked via their oxygen atom to the anomeric centre of a pyran ring system, was shown to undergo oxygen to carbon rearrangement upon treatment with a Lewisacid to give the corresponding 2-carbon substituted products. At low temperature, trimethylsilyl trifluoromethanesulfonate catalysed rearrangements of anomerically linked 6-substituted tetrahydropyranyl enol ethers gave selectively
Diastereoselective Anomeric Oxygen to Carbon Rearrangements of Silyl Enol Ether Derivatives of Lactols
作者:Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1055/s-1998-1867
日期:1998.10
Lewis acid promoted oxygen to carbon rearrangement of anomerically linked silyl enol ethers gives a new and diastereoselective route to the corresponding 2-α-hydroxyketone substituted products.
Anomeric Oxygen to Carbon Rearrangements of Alkynyl Tributylstannane Derivatives of Lactols
作者:Marianne F. Buffet、Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1055/s-1998-1866
日期:1998.10
Treatment of alkynyl tributylstannane tetrahydropyranyl and tetrahydrofuranyl ether derivatives with boron trifluoride etherate effects an efficient anomeric oxygen to carbon rearrangement leading to the corresponding carbon-linked alkynol products.