Total Synthesis of the Antibiotic Kendomycin by Macrocyclization using Photo-Fries Rearrangement and Ring-Closing Metathesis
作者:Thomas Magauer、Harry J. Martin、Johann Mulzer
DOI:10.1002/anie.200900522
日期:2009.8.3
Crossing swords: Two novel approaches to the antibiotic kendomycin are described. Salient features are complex Claisen–Ireland rearrangements and macrocyclizations by ring‐closing metathesis (RCM) and a photo‐Friesrearrangement (see retrosynthesis scheme).
Ring-Closing Metathesis and Photo-Fries Reaction for the Construction of the Ansamycin Antibiotic Kendomycin: Development of a Protecting Group Free Oxidative Endgame
作者:Thomas Magauer、Harryâ J. Martin、Johann Mulzer
DOI:10.1002/chem.200902226
日期:2010.1.11
total syntheses of the ansa‐polyketide (−)‐kendomycin (1) are described. The syntheses benefit from the use of readily available and cheap starting materials. Highly complex diastereoselective Claisen–Ireland rearrangements were used to introduce the (E)‐double bond and the C16‐Me group. The ring closure of the strained ansa macrocycle was achieved by ring‐closing metathesis and a highly efficient combination
Synthesis of all the six components of the female-produced contact sex pheromone of the German cockroach, Blattella germanica (L.)
作者:Kenji Mori
DOI:10.1016/j.tet.2008.02.040
日期:2008.4
All of the following six components of the female sexpheromone of the Germancockroach, Blattella germanica (L.) were synthesized: (3S,11S)-3,11-dimethyl-2-nonacosanone (1), its 29-hydroxy derivative 2, its 29-oxo derivative 3, (3S,11S)-3,11-dimethyl-2-heptacosanone (4), its 27-hydroxy derivative 5, and its 27-oxo derivative 6. Both the enantiomers of citronellal were employed as the chiral sources
The racemate and both enantiomers of patchouli alcohol have been synthesized by stereocontrolled routes. The olfactive properties of the patchouli alcohols prepared are reported.
Relevance of oxyanion stereochemistry to chirality transfer in anionic oxy-Cope rearrangements
作者:Leo A. Paquette、George D. Maynard
DOI:10.1021/ja00039a011
日期:1992.6
undergo anionic oxy-Coperearrangement under the exclusice control of oxyanion orientation with a 58-64% preference for equatorial oxygen. Six semicyclic dienols have also been synthesized where the preferred oxyanion-driven sigmatropic rearrangement pathway is obligatorily pitted against π-facial biases offered by 4-tert-butylcyclohexenyl, norbornenyl, and camphenyl rings. These rearrangements therefore