Double Conjugate Addition of Dithiols to Propargylic Carbonyl Systems To Generate Protected 1,3-Dicarbonyl Compounds
作者:Helen F. Sneddon、Alexandra van den Heuvel、Anna K. H. Hirsch、Richard A. Booth、David M. Shaw、Matthew J. Gaunt、Steven V. Ley
DOI:10.1021/jo052514s
日期:2006.3.31
methoxide to a wide variety of propargylic carbonyl containing compounds. The products of these reactions are differentiated, 1,3-dicarbonyl systems useful for various synthesis programs. By judicious use of hydroxylated substrates tandem cyclization occurs to afford tetrahydropyran lactols or, in the case of hydroxy-substituted propargylic esters, lactones. The corresponding amino-substituted propargylic
Double Michael addition of dithiols to acetylenic carbonyl compounds under the influence of molecular sieve and dimethyl sulfoxide
作者:Tomoko Kakinuma、Takeshi Oriyama
DOI:10.1016/j.tetlet.2009.11.002
日期:2010.1
Double Michael addition of dithiols such as 1,3-propanedithiol and 1,2-ethanedithiol to α,β-acetylenic carbonyl compounds in the presence of molecular sieve and dimethyl sulfoxide proceeds very smoothly to afford the corresponding β-keto 1,3-dithianes and β-keto 1,3-dithiolanes, respectively, in good to high yields.
Development of β-keto 1,3-dithianes as versatile intermediates for organic synthesis
作者:Matthew J. Gaunt、Helen F. Sneddon、Peter R. Hewitt、Paolo Orsini、David F. Hook、Steven V. Ley.
DOI:10.1039/b208982c
日期:——
β-Keto 1,3-dithianes can be generated by the double conjugate addition of dithiols to propargylic ketones, esters and aldehydes in excellent yields. As masked 1,3-dicarbonyl systems these substrates can be converted to a range of functionalised oxygen-containing heterocycles that can be used in natural product synthesis.
On the synthesis of β-keto-1,3-dithianes from conjugated ynones catalyzed by magnesium oxide
作者:Chunli Xu、Jonathan K. Bartley、Dan I. Enache、David W. Knight、Matthew Lunn、Martin Lok、Graham J. Hutchings
DOI:10.1016/j.tetlet.2008.02.030
日期:2008.4
Mao was used for the first time as a heterogeneous basic catalyst to synthesize beta-keto-1,3-dithianes, potentially useful synthetic intermediates, from conjugated ynones and ynoates. (C) 2008 Elsevier Ltd. All rights reserved.