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
Asymmetric synthesis via axially dissymmetric molecules. 7. Synthetic applications of the enantioselective reduction by binaphthol-modified lithium aluminum hydride reagents
作者:R. Noyori、I. Tomino、M. Yamada、M. Nishizawa
DOI:10.1021/ja00334a042
日期:1984.10
La reaction est applicable a une variete decomposescarbonyles insatures de structures diverses tels que, cetones aromatiques, cetones acetyleniques, cetones ethyleniques et aldehydes. L'utilite est illustree parla synthese fortement stereocontrolee d'intermediaires de prostaglandines, de quelques pheromones d'insectes, d'alcools terpeniques primaires chiraux, de phenyloxiranne optiquement actif
La 反应 est 适用一个 une variete de composes carbonyles insatures destructures different tels que, cetones aromatiques, cetones acetyleniques, cetones ethyleniques et aldehydes。L'utilite est illustree par la synthese fortement Stereocontrolee d'intermediaires de prostaglandines, de quelques pheromones d'insectes, d'alcools terpeniques primaires chiraux, de phenyloxiranne optiquement actif...
Novel pyrazole functionalized phthalocyanines and their first row transition metal complexes
作者:Daniel Dehe、Christian Lothschütz、Werner R. Thiel
DOI:10.1039/b9nj00485h
日期:——
Pyrazole functionalized phthalodinitriles derived from 4,5-dichlorophthalonitrile by SnAr reactions were used as precursors for the synthesis of phthalocyanines substituted with pyrazolyl groups in the 2,3,9,10,16,17,23,24-positions. The phthalocyanines were characterized by means of MALDI-TOF MS, IR, NMR and UV-Vis spectroscopy. The corresponding first row transition metalcomplexes with Mn(III),
A Facile Preparation of <i>e</i><i>xo</i>-Cyclic Conjugated Dienes Fused to Lactams or Lactones via Intramolecular Coupling of Acetylenes and Their Behavior in Diels−Alder Reactions
作者:Hirokazu Urabe、Ryota Nakajima、Fumie Sato
DOI:10.1021/ol0065221
日期:2000.11.1
[reaction: see text] Treatment of bis-acetylenic amides or esters 3 with (eta(2)-propene)Ti(O-i-Pr)(2) generates functionalized titanacyclopentadienes which, upon hydrolytic workup, give exo, exo-cyclic conjugated dienes 4 in good yields. Someregio- and stereochemicalaspects of their Diels-Alderreaction with dienophiles are also disclosed.