Iron-Catalyzed, Hydrogen-Mediated Reductive Cyclization of 1,6-Enynes and Diynes: Evidence for Bis(imino)pyridine Ligand Participation
作者:Kevin T. Sylvester、Paul J. Chirik
DOI:10.1021/ja902478p
日期:2009.7.1
The bis(imino)pyridine iron dinitrogen complex (((i)Pr)PDI)Fe(N(2))(2) catalyzes the hydrogen-mediated reductivecyclization of enynes and diynes with turnover frequencies comparable to those of established precious metal catalysts. Amino, oxygenated, and carbon-based substrates are readily cyclized to the corresponding hetero- and carbocycles with 5 mol % iron and 4 atm H(2) at 23 degrees C. Stoichiometric
Enantioselective Biocatalytic Oxidative Desymmetrization of Substituted Pyrrolidines
作者:Valentin Köhler、Kevin R. Bailey、Anass Znabet、James Raftery、Madeleine Helliwell、Nicholas J. Turner
DOI:10.1002/anie.200906655
日期:2010.3.15
Made up out of air: The highly enantioselectiveoxidation of 3,4‐substituted meso‐pyrrolidines to Δ1‐pyrrolines is reported. The reaction is catalyzed by monoamine oxidase from Aspergillus niger (MAO‐N D5) and utilizes molecular oxygen from air as the stoichiometric oxidant. The corresponding Δ1‐pyrrolines serve as useful building blocks for the synthesis of L‐proline analogues and α‐amino nitriles
Asymmetric desymmetrization of meso-pyrrolidine derivatives by enantiotopic selective CH hydroxylation using (salen)manganese(III) complexes
作者:T. Punniyamurthy、Tsutomu Katsuki
DOI:10.1016/s0040-4020(99)00518-9
日期:1999.7
Chiral (salen)manganese(III) complexes 1 catalyzed the asymmetric desymmetrization of N-protectedmeso-pyrrolidine derivatives 3, 6–8, 15 and 18 by enantiotopicselective C-H oxidation in the presence of terminal oxidant iodosylbenzene. The oxidation occurred chemoselectively at the carbon α to the nitrogen atom to afford optically active hydroxypyrrolidine derivatives 9, 11, 13, 16, 19 and 21 that
The present invention relates to heterocyclic compounds useful for antagonizing angiotensin II Type 2 (AT2) receptor. More particularly the invention relates to pyrrolidine and azetidine compounds, compositions containing them and their use in methods of treating or preventing disorders or diseases associated with AT2 receptor function including neuropathic pain, inflammatory pain, conditions associated with neuronal hypersensitivity, impaired nerve conduction velocity, cell proliferation disorders, disorders associated with an imbalance between bone resorption and bone formation and disorders associated with aberrant nerve regeneration.
本发明涉及可用于拮抗血管紧张素 II 2 型(AT2)受体的杂环化合物。更具体地说,本发明涉及吡咯烷和氮杂环丁烷化合物、含有它们的组合物及其在治疗或预防与 AT2 受体功能有关的紊乱或疾病的方法中的用途,这些紊乱或疾病包括神经性疼痛、炎症性疼痛、与神经元超敏性有关的病症、神经传导速度受损、细胞增殖紊乱、与骨吸收和骨形成失衡有关的紊乱以及与神经再生异常有关的紊乱。
Zirconocene-promoted stereoselective bicyclization of 1,6- and 1,7-dienes to produce trans-zirconabicyclo[3.3.0]octanes and cis-zirconabicyclo[4.3.0]nonanes
作者:Christophe J Rousset、Douglas R Swanson、Frédéric Lamaty、Ei-ichi Negishi