Total Synthesis of (<i>S</i>)-(+)-Citreofuran by Ring Closing Alkyne Metathesis
作者:Alois Fürstner、Anne-Sophie Castanet、Karin Radkowski、Christian W. Lehmann
DOI:10.1021/jo026686q
日期:2003.2.1
A concise total synthesis of citreofuran 4 is described, a structurally unique octaketide derivative belonging to the curvularin family. Key steps involve the elaboration of orsellinic acid methyl ester 5 to acid 14, which converts, on attempted formation of the corresponding acid chloride, to the 3-alkoxyisocoumarin derivative 20. This heterocycle can be used as an activated ester to give ketone 21
A new, highly stereoselective approach to pyrrolidines via overall 5-endo-trig cyclisations of homoallylic tosylamides
作者:Andrew D. Jones、David W. Knight
DOI:10.1039/cc9960000915
日期:——
Iodocyclisations of E-homoallylic tosylamides 7 lead to excellent yields of either 2,5-trans-or 2,5-cis-3-iodopyrrolidines (10 or 11), depending upon the reaction conditions.
Acid-promoted reaction of cyclic allylic diols with carbonyl compounds. Stereoselective ring-enlarging tetrahydrofuran annulations
作者:Mark J. Brown、Timothy Harrison、Paul M. Herrinton、Mark H. Hopkins、Kira D. Hutchinson、Larry E. Overman、Pratibha Mishra
DOI:10.1021/ja00014a031
日期:1991.7
high levels of stereocontrol by the title reaction. The scope and limitations of this powerful new method for assembling polycyclic ethers are explored in detail. Conformational analysis of potential oxabicyclo [4.4.0] decanyl, oxabicyclo [4.3.0] nonanyl, and oxabicyclo [4.2.0] octanyl cation intermediates allows the stereochemical outcome of the title reaction to be predicted
alkyne metathesis will always be the little brother of alkene metathesis, it allows problems to be solved that are currently beyond reach of the more famous sibling. This notion is exemplified by the tulearin macrolides, which could only be selectively forged by ring‐closing alkyne metathesis (RCAM)/trans reduction using the latest generation of alkyne metathesis catalysts.
The disclosure relates to anti-cancer compounds derived from nuclear steroid receptor binders, to products containing the same, as well as to methods of their use and preparation.