Highly Enantioselective Hydrogenation of Quinoline and Pyridine Derivatives with Iridium-(P-Phos) Catalyst
作者:Wei-Jun Tang、Jing Tan、Li-Jin Xu、Kim-Hung Lam、Qing-Hua Fan、Albert S. C. Chan
DOI:10.1002/adsc.200900870
日期:——
3′‐bipyridine] and iodine (I2) for the asymmetrichydrogenation of 2,6‐substituted quinolines and trisubstituted pyridines [2‐substituted 7,8‐dihydroquinolin‐5(6H)‐one derivatives] is reported. The catalyst worked efficiently to hydrogenate a series of quinoline derivatives to provide chiral 1,2,3,4‐tetrahydroquinolines in high yields and up to 96% ee. The hydrogenation was carried out at high S/C (substrate
Highly Stereoselective Formal [3 + 3] Cycloaddition Reactions of Chiral Vinylogous Amides with α,β-Unsaturated Iminiums
作者:Heather M. Sklenicka、Richard P. Hsung、Lin-Li Wei、Michael J. McLaughlin、Aleksey I. Gerasyuto、Shane J. Degen
DOI:10.1021/ol000049+
日期:2000.4.1
[formula: see text] Highly stereoselective formal [3 + 3] cycloaddition reactions of chiral vinylogous amides with alpha, beta-unsaturated iminiums are described. A mechanistic model is proposed to rationalize the observed stereoselectivity. The 6 pi-electron electrocyclic ring closure appears to be reversible, and a preferredrotation of the alkenyl group, one of the three 2 pi-components, during the ring
Iridium-catalyzed asymmetric hydrogenation of pyridine derivatives, 7,8-dihydro-quinolin-5(6H)-ones
作者:Xiao-Bing Wang、Wei Zeng、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2008.05.138
日期:2008.8
[Ir(COD)Cl]2/MeO-Biphep/I2 catalyst system is highly effective for asymmetrichydrogenation of pyridine derivatives 7,8-dihydro-quinolin-5(6H)-ones with high enantioselectivities (up to 97% ee).
[Ir(COD)Cl] 2 / MeO-Biphep / I 2催化剂体系对不对称氢化吡啶衍生物7,8-二氢喹啉-5(6 H)-具有高对映选择性(至多97%ee)非常有效)。
Organocatalytic Enantioselective Reduction of Pyridines