An Isothiourea-Catalyzed Asymmetric [2,3]-Rearrangement of Allylic Ammonium Ylides
摘要:
Benzotetramisole promotes the catalytic asymmetric [2,,3]-rearrangement of allylic quaternary ammonium salts (either isolated or prepared in situ from p-nitrophenyl bromoacetate and the corresponding allylic amine), generating syn-alpha-amino acid derivatives with excellent diastereo- and enantioselectivity (up to >95:5 dr; up to >99% ee).
Asymmetric copper-catalyzed allylic alkylation between allyl bromides and alkyl Grignard reagents using a P-chiral monophosphorus ligand is described. A range of terminal olefins bearing tertiary or quaternary carbon centers were formed in good branched/linear selectivities and excellent enantioselectivities at copper loadings as low as 0.5 mol %.
made conveniently through condensation of corresponding isatins with N-diphenylmethyl amine, are deprotonated to form azaallyl anions. Allylation and alkylation of this type of intermediates proceed smoothly with diverse C-electrophiles. Acidic work up finishes 3-amino-3-allyl/alkyl oxindoles. The overall transformation equals to an umpolung process at the C3 of isatins.
Iridium‐Catalyzed Enantioselective Hydroarylation of Alkenes through C−H bond Activation: Experiment and Computation
作者:Valmik S. Shinde、Manoj V. Mane、Luigi Cavallo、Magnus Rueping
DOI:10.1002/chem.202001793
日期:2020.7.2
A new catalytic enantioselective hydroarylation of unactivated olefins is developed that provides rapid access to functionalized chiral dihydrobenzofurans with good yields and excellent enantioselectivities. Simple aromatic ketones or amides act as a directing group allowing the regioselective reaction at the more hindered ortho position. Tertiary benzylic stereocenters are obtained directly under
[EN] SMALL MOLECULE NEUROPEPTIDE S ANTAGONISTS FOR THE TREATMENT OF ADDICTIVE DISORDERS, MOOD, ANXIETY AND SLEEP DISORDERS<br/>[FR] ANTAGONISTES À PETITE MOLÉCULE DU NEUROPEPTIDE S DESTINÉS AU TRAITEMENT D'UNE TOXICOMANIE OU DE TROUBLES DE L'HUMEUR, DE L'ANXIÉTÉ ET DU SOMMEIL
申请人:US HEALTH
公开号:WO2011137220A1
公开(公告)日:2011-11-03
Disclosed are compounds of General Formula I: wherein R1, R2, R3, X and Y are described herein, as well as pharmaceutically acceptable salts, solvates, and stereoisomers thereof. Pharmaceutical compositions comprising such compounds, as well as methods of use, and treatment for neuropsychiatric disorders including pain, sleep, mood, anxiety, eating and addictive disorders, are also provided.
Iminoacylation of Alkenes via Photoredox N-Heterocyclic Carbene Catalysis
作者:Yi-Xiong Dong、Chun-Lin Zhang、Zhong-Hua Gao、Song Ye
DOI:10.1021/acs.orglett.3c00006
日期:2023.2.10
alkene-tethered α-imino-oxy acids and acylimidazoles. The corresponding substituted 3,4-dihydro-2H-pyrroles were afforded in moderate to good yields with good to high diastereoselectivities in most cases. The reaction involves the 5-exo-trig radical cyclization of an alkene-tethered iminyl radical and the following coupling with a ketyl radical from acylimidazole under NHC catalysis.