The present invention relates to a process for the preparation of cis-2-(2-methylprop-1-enyl)-4-methyltetrahydropyran comprising the catalytic hydrogenation of 2-(2-methylprop-1-enyl)-4-methylenetetrahydropyran in the presence of hydrogen and a heterogeneous catalyst comprising ruthenium on a support and subsequently bringing the compounds obtained in this way into contact with a strongly acidic cation exchanger.
The present invention relates to a process for the preparation of a composition enriched in cis-2-(2-methylprop-1-enyl)-4-methyltetrahydropyran, comprising the catalytic hydrogenation of 2-(2-methylprop-1-enyl)-4-methylenetetrahydropyran in the presence of hydrogen and a heterogeneous catalyst comprising ruthenium.
Sequential Ru−Pd Catalysis: A Two-Catalyst One-Pot Protocol for the Synthesis of N- and O-Heterocycles
作者:Barry M. Trost、Michelle R. Machacek、Brian D. Faulk
DOI:10.1021/ja060812g
日期:2006.5.1
differs between the use of amine versus alcohol nucleophiles. The method also affords heterocyclic products that are synthetically useful intermediates. Through the Z-vinylsilane a variety of stereodefined trisubstituted olefin products can be accessed including several all-carbon motifs. Finally, the utility of these heterocyclic products in total synthesis is demonstrated through concise syntheses
Stereoselective synthesis of opticallyactive rose oxide (1) by KHSO4 and Pd–BINAP-catalyzed cyclization of (3R)- and (3S)-3,7-dimethyl-6,7-octadien-1-ol (5) is described. One-pot synthesis of the (3R)- and (3S)-allenyl alcohol 5 from (3R)- and (3S)-citronellol (2) (98% ee) is also described. Furthermore, the odor properties of the four diastereomers of 1 are reported.
The eight stereoisomeric sesquirose oxides 9 to 16 were prepared from the fouropticallyactive rose oxides 1 to 4. The spectral data, optical rotations and the olfactive properties of 9 to 16 are given.