Intramolecular cycloadditions of nitrones derived from optically active 1-alkenyl-2-imidazolecarbaldehydes: regio- and diastereoselectivity
摘要:
Enantiopure polyfunctionalized imidazo[1,2-a]pyridines and pyrrolo[1,2-a]imidazoles, two classes of heterocyclic compounds including anti-inflammatories and glycosidase inhibitors, were synthesized starting from natural alpha-aminoacids and exploiting an intramolecular nitrone cycloaddition as the key step. The regiochemistry of the cycloaddition, which determines the product distribution, was markedly dependent on the R substituent and, therefore, submitted to a theoretical study by means of ab initio and MP2 calculations. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of the chiral (8S)-7-aza-1,3(E),9-decatriene system from natural .alpha.-amino acids and its intramolecular Diels-Alder reaction directed toward chiral trans-hydroisoquinolones
Design, synthesis, and SAR of macrocyclic tertiary carbinamine BACE-1 inhibitors
作者:Stacey R. Lindsley、Keith P. Moore、Hemaka A. Rajapakse、Harold G. Selnick、Mary Beth Young、Hong Zhu、Sanjeev Munshi、Lawrence Kuo、Georgia B. McGaughey、Dennis Colussi、Ming-Chih Crouthamel、Ming-Tain Lai、Beth Pietrak、Eric A. Price、Sethu Sankaranarayanan、Adam J. Simon、Guy R. Seabrook、Daria J. Hazuda、Nicole T. Pudvah、Jerome H. Hochman、Samuel L. Graham、Joseph P. Vacca、Philippe G. Nantermet
DOI:10.1016/j.bmcl.2007.04.072
日期:2007.7
and synthesis of tertiary carbinamine macrocyclic inhibitors of the beta-secretase (BACE-1) enzyme. These macrocyclic inhibitors, some of which incorporate novel P2 substituents, display a 2- to 100-fold increase in potency relative to the previously described acyclicanalogs while affording greater stability.
Direct, Enantioselective Iridium-Catalyzed Allylic Amination of Racemic Allylic Alcohols
作者:Marc Lafrance、Markus Roggen、Erick M. Carreira
DOI:10.1002/anie.201108287
日期:2012.4.2
The direct route: Iridium‐catalyzed direct conversion of branched allylicalcohols into enantioenriched branched primary allylic amines is highly regio‐ and enantioselective (see scheme; coe=cyclooctene).
A new stereoselective synthesis of chiral γ-functionalized (E)-allylic amines
作者:Gianna Reginato、Alessandro Mordini、Flavia Messina、Alessandro Degl'Innocenti、Giovanni Poli
DOI:10.1016/0040-4020(96)00617-5
日期:1996.8
Chiral t-Boc protected propargylic amines have been obtained starting from aminoaldehydes derived from natural aminoacids. Stannylcupration of these substrates affords an easy regio- and stereocontrolled route to the corresponding γ-stannylated (E)-allylamines which are useful intermediates for the synthesis of the corresponding γ-funtionalized allylic systems.
Stereoselective Copper-Catalyzed Intramolecular Alkene Aminooxygenation: Effects of Substrate and Ligand Structure on Selectivity
作者:Monissa C. Paderes、Sherry R. Chemler
DOI:10.1002/ejoc.201100444
日期:2011.7
A new protocol for diastereoselective copper-catalyzed intra-molecular alkene aminooxygenation, which provides methyleneoxy-functionalized disubstituted pyrrolidines and five-membered cyclic ureas from the corresponding γ-alkenyl sulfonamides and N-allylureas, is reported. In addition, some success was achieved in enantioselective desymmetrizations reactions. We discovered that the level of enantioselectivity
报道了一种非对映选择性铜催化分子内烯烃氨基氧化的新方案,该方案从相应的 γ-烯基磺酰胺和 N-烯丙基脲中提供亚甲氧基官能化的二取代吡咯烷和五元环脲。此外,对映选择性去对称化反应也取得了一些成功。我们发现对映选择性和非对映选择性的水平可以通过选择铜 (II) 配体和底物 N 取代基来调节。