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
Synthesis of Cyclopropyl-Substituted Furans by Brønsted Acid Promoted Cascade Reactions
作者:J. Stephen Clark、Filippo Romiti、Kirsten F. Hogg、Malai Haniti S. A. Hamid、Sven C. Richter、Alistair Boyer、Joanna C. Redman、Louis J. Farrugia
DOI:10.1002/anie.201500625
日期:2015.5.4
Chloroacetic acidpromotes an efficient and diastereoselective intramolecular cascadereaction of electron‐deficient ynenones to deliver products featuring a 2,3,5‐trisubstituted furan bearing a fused cyclopropyl substituent at the 5‐position. Synthetically relevant polycyclic building blocks featuring rings of various sizes and heteroatoms have been synthesized in high yield using this mild acid‐catalyzed
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.
Addition of Dithiols to Bis-Ynones: Development of a Versatile Platform for the Synthesis of Polyketide Natural Products
作者:Helen F. Sneddon、Matthew J. Gaunt、Steven V. Ley
DOI:10.1021/ol034248f
日期:2003.4.1
[reaction: see text] The conjugate addition of dithiols to bis-ynones generates a versatile masked 1,3,5-triketone platform. These functional units are useful intermediates for the synthesis of oxygen-containing heterocycles commonly found in polyketide natural products. The tetrahydropyranyl fragments of the marine macrolides Lyngbouilloside and Callipeltoside A have been synthesized with use of this