Concise total syntheses of palominol, dolabellatrienone, β-araneosene, and isoedunol via an enantioselective Diels-Alder macrobicyclization
Concise total syntheses of four members of the dolabellane family of diterpenoid natural products are reported. Key features of the developed route include the first demonstration of an enantioselective, intramolecular Type I Diels-Alder macrobicyclization, the first example of a stereoselective π-allyl Stille coupling reaction involving a farnesyl-derived intermediate, a powerful new reagent for the formation of dithianes with acid-sensitive molecules, and a unique and highly efficient ring-contraction sequence based on a modified Wolff photochemical rearrangement. Copyright
Snyder, Scott A.,Corey
p. 740 - 742
(2007/10/03)
gem-Difluoro Compounds: A Convenient Preparation from Ketones and Aldehydes by Halogen Fluoride Treatment of 1,3-Dithiolanes
gem-Difluoro compounds can be prepared from ketones and aldehydes by formation of the corresponding 1,3-dithiolanes, followed by reaction with 1,3-dibromo-5,5-dimethylhydantoin and pyridinium poly(hydrogenfluoride) (HF-pyridine) in methylene chloride.The
Sondej, Susan C.,Katzenellenbogen, John A.
p. 3508 - 3513
(2007/10/02)
Comparative radioprotective activity of various pentagonal compounds with two heteroatomes
Various heterocyclic compounds with two heteroatomes were synthesized and their potential radioprotective activity was tested. This study shows the interest of phenylthiazolidines derivatives in chemical radioprotection.
Robbe,Fernandez,Dubief,et al.
p. 235 - 243
(2007/10/02)
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