Synthesis of Enantioenriched 2-Alkyl Piperidine Derivatives through Asymmetric Reduction of Pyridinium Salts
作者:Bo Qu、Hari P. R. Mangunuru、Xudong Wei、Keith R. Fandrick、Jean-Nicolas Desrosiers、Joshua D. Sieber、Dmitry Kurouski、Nizar Haddad、Lalith P. Samankumara、Heewon Lee、Jolaine Savoie、Shengli Ma、Nelu Grinberg、Max Sarvestani、Nathan K. Yee、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/acs.orglett.6b02401
日期:2016.10.7
An Ir-catalyzed enantioselective hydrogenation of 2-alkyl-pyridines has been developed using ligand MeO-BoQPhos. High levels of enantioselectivities up to 93:7 er were obtained. The resulting enantioenriched piperidines can be readily converted into biologically interesting molecules such as the fused tricyclic structures 5, 6, and 7 in 99:1 er, providing a novel, concise synthetic route to this family
使用配体 MeO-BoQPhos 开发了 Ir 催化的 2-烷基-吡啶对映选择性氢化。获得了高达 93:7 er 的高水平对映选择性。所得的对映体富集的哌啶可以很容易地转化为生物学上感兴趣的分子,例如99:1的稠合三环结构5、6和7,为该类手性含哌啶化合物提供了一种新颖、简洁的合成路线。
Palladium-Catalyzed Regio-, Diastereo-, and Enantioselective Benzylic Allylation of 2-Substituted Pyridines
作者:Barry M. Trost、David A. Thaisrivongs
DOI:10.1021/ja904441a
日期:2009.9.2
We report a new method for the highly regio-, diastereo-, and enantioselective palladium-catalyzed allylic alkylation of 2-substituted pyridines that allows for the formation of homoallylic stereocenters containing alkyl, aryl, heteroaryl, and nitrogen substituents. When the reaction is conducted with asymmetric acyclic electrophiles, both linear and branched products may be obtained exclusively by