Highly efficient and enantioselective hydrogenation of quinolines and pyridines with Ir-Difluorphos catalyst
作者:Weijun Tang、Yawei Sun、Lijin Xu、Tianli Wang、Qinghua Fan、Kim-Hung Lam、Albert S. C. Chan
DOI:10.1039/c002668a
日期:——
resulted in a highly efficient catalyst system for asymmetrichydrogenation of quinolines at quite low catalyst loadings (0.05–0.002 mol%), affording the corresponding products with high enantioselectivities (up to 96%), excellent catalytic activities (TOF up to 3510 h−1) and productivities (TON up to 43000). The same catalyst was also successfully applied to the asymmetrichydrogenation of trisubstituted
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
The highly enantioselective hydrogenation of quinoline derivatives is developed using [Ir(COD)Cl]2/(R)-MeO-Biphep/I2 system, and this methodology has been applied to the asymmetric synthesis of three naturally occurring alkaloids angustureine, galipinine, and cuspareine. This method provided an efficient access to a variety of optically active tetrahydroquinolines with up to 96% ee.
喹啉衍生物的高度对映选择性氢化是使用 [Ir(COD)Cl]2/(R)-MeO-Biphep/I2 系统开发的,该方法已应用于三种天然生物碱 angustureine、galipinine 和葛根素。这种方法可以有效地获得各种具有高达 96% ee 的光学活性四氢喹啉。
Asymmetric Hydrogenation of Quinolines Catalyzed by Iridium with Chiral Ferrocenyloxazoline Derived N,P Ligands
作者:Sheng-Mei Lu、Xiu-Wen Han、Yong-Gui Zhou
DOI:10.1002/adsc.200404017
日期:2004.7
Chiral ferrocenyloxazoline derived N,Pligands are used in the iridium-catalyzed asymmetrichydrogenation of quinolines, and up to 92% ee was obtained. The role of the planar chirality is also studied.
Air-stable Ir-(P-Phos) complex for highly enantioselective hydrogenation of quinolines and their immobilization in poly(ethylene glycol) dimethyl ether (DMPEG)
作者:Lijin Xu、Kim Hung Lam、Jianxin Ji、Jing Wu、Qing-Hua Fan、Wai-Hung Lo、Albert S. C. Chan
DOI:10.1039/b416397d
日期:——
An air-stable catalyst system Ir-(P-Phos) catalyst was found to be highly effective in the asymmetric hydrogenation of quinoline derivatives. The catalyst immobilized in DMPEG was efficiently recovered and reused eight times, retaining reactivity and enantioselectivity.