A concise one-pot synthesis of trifluoromethyl-containing 2,6-disubstituted 5,6,7,8-tetrahydroquinolines and 5,6,7,8-tetrahydronaphthyridines
作者:Russell J. Johnson、Donogh J. R. O'Mahony、William T. Edwards、Matthew A. J. Duncton
DOI:10.1039/c2ob27113c
日期:——
5,6,7,8-Tetrahydroquinolines and 5,6,7,8-tetrahydronaphthyridines with appended trifluoromethyl groups are valuable chemotypes in medicinal chemistry due to the presence of a partially-saturated bicyclic ring and metabolically-stable CF3 group. 1H NMR studies were used to optimize the preparation of such compounds, using a three-step/one-pot procedure, to provide novel 2,6-disubstitued derivatives with a tertiary-substituent. Racemic 2,6-disubstituted tetrahydroquinolines were separated by chiral HPLC to provide single enantiomers.
Nickel-Catalyzed Cross-Coupling of Diphenylphosphine with Vinyl Bromides and Chlorides as a Route to Diphenylvinylphosphines
作者:Marina A. Kazankova、Mstilsav O. Shulyupin、Evgeniy A. Chirkov、Irina P. Beletskaya
DOI:10.1055/s-2005-863714
日期:——
An efficient nickel-catalyzed reaction for the phosphination of vinyl bromides and chlorides was developed. The procedure uses a combination of up to 1 mol% of nickel acetylacetonate, triethylamine and dimethylformamide as a solvent. The double bond geometry of the vinyl halides was retained under the reaction conditions.
A Convenient Route for the Synthesis of 2-<i>C</i>-Substituted 2-Deoxyhexoses
作者:Hideyuki Sugimura、Kenji Osumi、Tatsuyuki Koyama
DOI:10.1246/cl.1991.1379
日期:1991.8
A facile method has been developed for the synthesis of 2-C-substituted 2-deoxy-D-glucoses and 2-C-disubstituted 2-deoxy-D-arabino-hexoses using the BF3-catalyzed cyclization between 1-alkenyl ethers and 2,3-O-isopropylidene derivative of aldehydo-D-erythrose.
Stereoselective Total Syntheses of Three <i>Lycopodium</i> Alkaloids, (−)-Magellanine, (+)-Magellaninone, and (+)-Paniculatine, Based on Two Pauson−Khand Reactions
作者:Takashi Kozaka、Naoki Miyakoshi、Chisato Mukai
DOI:10.1021/jo702136b
日期:2007.12.1
The totalsyntheses of (−)-magellanine, (+)-magellaninone, and (+)-paniculatine were completed from diethyl l-tartrate via the common intermediate in a stereoselective manner. The crucial steps in these syntheses involved two intramolecular Pauson−Khand reactions of enynes: the first Pauson−Khand reaction constructed the bicyclo[4.3.0] carbon framework, the corresponding A and B rings of these alkaloids