Rhodium-Catalyzed Enantioselective Intramolecular Hydroacylation of Trisubstituted Alkenes
作者:Kirsten F. Johnson、Eugene A. Schneider、Brian P. Schumacher、Arkady Ellern、Joseph D. Scanlon、Levi M. Stanley
DOI:10.1002/chem.201603880
日期:2016.10.24
We report the first examples of transition metal‐catalyzedenantioselective alkene hydroacylations with 1,1,2‐trisubstituted alkenes. DFT and mechanistic studies are consistent with a reaction pathway for these rhodium‐catalyzed processes including intramolecular alkene hydroacylation and α‐epimerization to generate highly enantioenriched, polycyclic architectures. This reaction sequence enables the
New polycyclic indanylimidazoles with alpha2 adrenergic activity
申请人:——
公开号:US20020013356A1
公开(公告)日:2002-01-31
A compound of formula I
1
wherein R
1
to R
3
, —A—, m and t are as defined in claim
1,
or a pharmaceutically acceptable salt or ester thereof, useful as an alpha2 adrenergic agent.
describe a catalytic asymmetric iminium ion cyclization reaction of simple 2-alkenylbenzaldimines using a BINOL-derived chiral N-triflyl phosphoramide. The corresponding 1-aminoindenes and tetracyclic 1-aminoindanes are formed in good yields and high enantioselectivities. Further, the chemical utility of the obtained enantiopure 1-aminoindene is demonstrated for the asymmetric synthesis of (S)-rasagiline
我们描述了使用 BINOL 衍生的手性N-三氟甲基磷酰胺的简单 2-烯基苯甲醛二亚胺的催化不对称亚胺离子环化反应。相应的 1-氨基茚和四环 1-氨基茚以良好的产率和高对映选择性形成。此外,所获得的对映体纯 1-氨基茚的化学效用被证明用于 ( S )-雷沙吉兰的不对称合成。
A one pot in situ combined Shapiro-Suzuki reaction
作者:Marco S Passafaro、Brian A Keay
DOI:10.1016/0040-4039(95)02210-4
日期:1996.1
The Shapiro and Suzuki reactions have been combined in situ to provide aryl-alkenes in moderate to good yields without the isolation of boron containing intermediates.
Vinyl azides in heterocyclic synthesis. Part 4. Thermal and photochemical decomposition of azidocinnamates containing ortho-cycloalkenyl substituents
作者:Christopher J. Moody、Graham J. Warrellow
DOI:10.1039/p19860001123
日期:——
Thermolysis of azidocinnamates containing ortho-cycloalkenyl substituents leads to isoquinolines and benzazepines formed by interception of the azide, or derived vinylnitrene, by the neighbouring double bond, the stability of the azide varying with the ring size of the cyclic alkene substituent. The cycloheptenyl (1a) and cyclopentenyl (1c) azidesdecompose at room temperature by intramolecular cycloaddition