Ring-opening of tertiary cyclopropanols derived from β-diketones
摘要:
The ring-opening reaction of 1,2-di substituted cyclopropanols, prepared from beta-diketones, mediated by Cu(NO3)(2), p-TsOH, and NaOH is reported. The Cu(II)-mediated ring-opening of cyclopropanols gave alpha-methylene-gamma-diketones in good yields. The reaction took place at the less substituted carbon of the cyclopropanols, involving mild conditions and a simple procedure. The reaction induced by p-TsOH in CH2O2 afforded alpha-methyl-gamma-diketones as the major product with minor amounts of 8-diketones. The 2,3,5-tri substituted furans were obtained in high yields when the ring-opening reaction was mediated by p-TsOH in methanol under reflux conditions. In the presence of sodium hydroxide the reaction proceeded smoothly in preference to the formation of beta-diketones, particularly for substrates with an aromatic group on the cyclopropane. (c) 2006 Elsevier Ltd. All rights reserved.
Titanium-Mediated Domino Cross-Coupling/Cyclodehydration and Aldol-Addition/Cyclocondensation: Concise and Regioselective Synthesis of Polysubstituted and Fused Furans
作者:Lu Ren、Juan Luo、Linbo Tan、Qiang Tang
DOI:10.1021/acs.joc.1c02894
日期:2022.3.4
Titanium enolates, in situ-generated from readily available ketones and titanium tetraisopropoxide, undergo domino cross-coupling/cyclodehydration or domino Aldol-addition/cyclocondensation with α-chloroketones to provide synthetically valuable furan derivatives. The domino process tolerates a variety of cyclic and acyclic ketones and chloroketones, producing polysubstituted furans and bi-, tri-, and
The present invention relates to the use of predominantly known pyridyl carboxamide derivatives as nematicides, compositions containing such compounds and methods for the control of nematodes.
Novel heterocyclic amide derivatives and their use as dopamine D3 receptor ligands
申请人:Hendrix A. James
公开号:US20070142351A1
公开(公告)日:2007-06-21
The invention relates to heterocyclic substituted amide derivatives that display selective binding to dopamine D
3
receptors. In another aspect, the invention relates to a method for treating central nervous system disorders associated with the dopamine D
3
receptor activity in a patient in need of such treatment comprising administering to the subject a therapeutically effective amount of said compounds for alleviation of such disorder. The central nervous system disorders that may be treated with these compounds include Psychotic Disorders, Substance Dependence, Substance Abuse, Dyskinetic Disorders (e.g. Parkinson's Disease, Parkinsonism, Neuroleptic-Induced Tardive Dyskinesia, Gilles de la Tourette Syndrome and Huntington's Disease), Dementia, Anxiety Disorders, Sleep Disorders, Circadian Rhythm Disorders and Mood Disorders. The subject invention is also directed towards processes for the preparation of the compounds described herein as well as methods for making and using the compounds as imaging agents for dopamine D
3
receptors.