N-Phosphano nitrogen-containing five-membered aromatic chiral α-sulfoxides as new chiral ligands in asymmetric palladium-catalyzed allylic alkylation: stereoelectronic effects of the substituents on the aromatic rings
摘要:
New chiral ligands, N-diphenylphosphano nitrogen-containing five-membered aromatic compounds bearing chiral sulfinyl groups as the sole chiral source has been developed. The structure of a palladium intermediate derived from the new chiral sulfoxide ligand was determined as a palladium complex with a five-membered chelate ring formed by coordination of the phosphano group and the sulfinyl sulfur atom involved. The stereoelectronic effects of substituents on the aromatic rings are discussed. (C) 2004 Elsevier Ltd. All rights reserved.
Cyanation of indoles with benzyl cyanide as the cyanide anion surrogate
作者:Lianpeng Zhang、Qiaodong Wen、Jisong Jin、Chen Wang、Ping Lu、Yanguang Wang
DOI:10.1016/j.tet.2013.03.089
日期:2013.5
A copper-mediated direct cyanation of indoles with benzyl cyanide as the cyanideanion surrogate has been achieved. The cascade reaction furnished 3-cyanoindoles under mild reaction conditions in good to excellent yields with various functional groups tolerance.
Reduction of 1-pyrrolyl and 1-indolyl carbamates to hemiaminals
作者:He-Chu Hsu、Duen-Ren Hou
DOI:10.1016/j.tetlet.2009.10.025
日期:2009.12
Hemiaminals of pyrroles and indoles have been prepared from the lithiumaluminum hydride reduction of 1-pyrrolyl and 1-indolyl carbamates with good yields (67–82%). These carbamates are more reactive than aliphatic amides and carbamates under the LAH reduction, but less reactive than esters.
Development of two processes for the synthesis of bridged azabicyclic systems: intermolecular radical addition–homoallylic rearrangements leading to 2-azanorborn-5-enes and neophyl-type radical rearrangements to 2-azabenzonorbornanes
作者:David M. Hodgson、Magnus W. P. Bebbington、Paul Willis
DOI:10.1039/b306717n
日期:——
Radical thiol additions to 7-azanorbornadienes give 7-thio-substituted 2-azanorbornenes and Barton deoxygenations of 7-azabenzonorbornanols give 2-azabenzonorbornanes. The processes both involve novel nitrogen-directed radicalrearrangements. The kinetics and mechanisms of the reactions are also discussed.
2-Azabenzonorbornanes from 7-Azabenzonorbornanols by a Nitrogen-Directed Neophyl-Type Radical Rearrangement
作者:David M. Hodgson、Magnus W. P. Bebbington、Paul Willis
DOI:10.1021/ol027039o
日期:2002.11.1
[reaction: see text] Barton deoxygenation of 7-azabenzonorbornanols leads to a synthetically useful neophyl-like rearrangement to give 2-azabenzonorbornane derivatives in 64-90% yields.
Structure–Activity Relationship Studies of Trisubstituted Isoxazoles as Selective Allosteric Ligands for the Retinoic-Acid-Receptor-Related Orphan Receptor γt
作者:Femke A. Meijer、Annet O.W.M. Saris、Richard G. Doveston、Guido J.M. Oerlemans、Rens M.J.M. de Vries、Bente A. Somsen、Anke Unger、Bert Klebl、Christian Ottmann、Peter J. Cossar、Luc Brunsveld
DOI:10.1021/acs.jmedchem.1c00475
日期:2021.7.8
drawbacks associated with orthosteric modulators. Recently, trisubstitutedisoxazoles were identified as a novel class of allosteric RORγt inverse agonists. This chemotype offers new opportunities for optimization into selective and efficacious allosteric drug-like molecules. Here, we explore the structure–activity relationship profile of the isoxazole series utilizing a combination of structure-based design