The first regio-, diastereo-, and enantioselective direct Michaelreaction of β,γ-unsaturated ketones with nitroolefins is enabled by Brønsted base/hydrogen-bonding bifunctional catalysis. A squaramide-substituted tertiary amine catalyzes the reaction of a broad range of β,γ-unsaturated ketones to proceed at the α-site exclusively, giving rise to adducts with two consecutive tertiary carbon stereocenters
[EN] SUBSTITUTED 3-ALKYL AND 3-ALKENYL AZETIDINE DERIVATIVES<br/>[FR] DERIVES 3-ALKYLE ET 3-ALCENYLE AZETIDINE SUBSTITUES
申请人:MERCK & CO INC
公开号:WO2005000809A1
公开(公告)日:2005-01-06
Novel compounds of the structural formula (I) are antagonists and/or inverse agonists of the Cannabinoid-1 (CB1) receptor and are useful in the treatment, prevention and suppression of diseases mediated by the CB1 receptor. The compounds of the present invention are useful as centrally acting drugs in the treatment of psychosis, memory deficits, cognitive disorders, migraine, neuropathy, neuro-inflammatory disorders including multiple sclerosis and Guillain-Barre syndrome and the inflammatory sequelae of viral encephalitis, cerebral vascular accidents, and head trauma, anxiety disorders, stress, epilepsy, Parkinson’s disease, movement disorders, and schizophrenia. The compounds are also useful for the treatment of substance abuse disorders, the treatment of obesity or eating disorders, as well as the treatment of asthma, constipation, chronic intestinal pseudo-obstruction, and cirrhosis of the liver.
Cross-couplingreactions between α,β-unsaturated carbonyl compounds and aromatic aldehydes have been achieved in tetrahydrofuran (THF) at 25 °C under N2 using a catalytic amount of InCl3 (0.05 molar amount to the substrate) in the presence of both chlorotrimethylsilane (TMSCl) and aluminum foil (Al). These reactions provide the corresponding β,γ-unsaturated ketones in moderate yields, together with
Metal‐Free Photochemical Olefin Isomerization of Unsaturated Ketones via 1,5‐Hydrogen Atom Transfer
作者:Rajendran Manikandan、Ravindra S. Phatake、N. Gabriel Lemcoff
DOI:10.1002/chem.202200634
日期:2022.5.19
Bring on the Light: An efficient photochemical metal/catalyst-free system has been uncovered for the selective one-bond olefin migration of unsaturated ketones. Diverse substrate scope, functional group tolerance and its application for dehomologation and one-carbon selective olefin migration processes in linear alkenes highlights the usefulness of this method.