A Conia‐Ene‐Type Cyclization under Basic Conditions Enables an Efficient Synthesis of (−)‐Lycoposerramine R
作者:Felix W. W. Hartrampf、Takayuki Furukawa、Dirk Trauner
DOI:10.1002/anie.201610021
日期:2017.1.16
An enantioselective total synthesis of the Lycopodium alkaloid lycoposerramine R is presented. It relies on a base‐mediated cyclization that resembles the Conia‐ene reaction of ynones and gold‐catalyzed variants thereof. Thus, hydrindanones and other functionalized ring systems bearing an exocyclic alkene can be rapidly accessed at room temperature without noble metal catalysis or substrate preactivation
Zur Aufklärung der absoluten Konfigurationvon Terpinenol-(4) wurde (−)-Terpinenol-(4) über das (+)-Carvomenthol mit dem (−)-Limonen verbunden. Das (−)-Terpinenol-(4) besitzt daher die (4R)-Konfiguration. Für das (+)-Terpinenol-(4) wurde auf indirektem Wege die (4S)-Konfiguration ermittelt.
Reactions of (R)-4-Menthen-3-one with Aluminum and Boron-Containing Hydrides
作者:G. Yu. Ishmuratov、E. R. Latypova、V. S. Tukhvatshin、A. A. Smol’nikov、R. R. Muslukhov、N. M. Ishmuratova、R. F. Talipov
DOI:10.1007/s10600-013-0443-1
日期:2013.1
It was shown that the most effective and stereospecific hydride reductant for (R)-4-menthen-3-one to (1R,3R)-menthen-3-ol was i-Bu2AlH whereas the complex BH3·THF, which exhibited the same properties relative to the substrate carbonyl, was a regiospecific but relatively non-stereospecific hydroborating reagent of its double bond.
(R)-4-menthen-3-one in the synthesis of (3S)-methylundecand (2S)-methyldec-1-ylbromides, key synthons for (S,S,S)-diprionylacetate
作者:E. R. Latypova、A. V. Bannova、R. R. Muslukhov、M. A. Shutova、R. F. Talipov、G. Yu. Ishmuratov
DOI:10.1007/s10600-010-9619-0
日期:2010.7
New capabilities for the synthetic use of (R)-4-menthen-3-one were demonstrated using as examples (3S)-methylundec- and (2S)-methyldec-1-ylbromides, key synthons for (S,S,S)-diprionylacetate (sex pheromone of pine sawflies of genera Diprion and Neodiprion).