Synthesis and cytotoxic evaluation of some styryl ketones and related compounds
摘要:
A number of 1-aryl-4-methyl-1-penten-3-ones 1 were converted to the corresponding Mannich bases 2 and analogues 3. Attempts to form the azines 4 from several members in series 1 led to the isolation of the corresponding pyrazolines 5 or aryl aldehyde azines 6. Replacement of the isopropyl group of a compound in series 1 by methyl and ethyl functions led to ketones that reacted with hydrazine producing the corresponding azines. The Mannich bases displayed greater activity than the precursor ketones towards murine P388 and L1210 leukemia cells as well as to a panel of human tumour cell lines. Certain of the Mannich bases had selective toxicity towards some human tumour cell lines and others to L1210 cells (in contrast to human T lymphocytes). Several drug-resistant cell lines were shown to be free from cross resistance to a number of the Mannich bases.
Isomerization of oxime derivatives was researched in detail to find out the methods for the syn-anti isomerization of O-substituted oximes. Based on these findings were developed simple methods for the preparation of aza-heterocycles from both stereoisomers of oximes. Quinolines were synthesized from β-aryl ketone oximes by treatment with trifluoroacetic anhydride and 4-chloranil. γ,δ-Unsaturated O-methoxyacetyloximes were transformed to 2H-dihydropyrroles by reaction with methoxy-acetic acid.
Decarboxylative homo-Nazarov cyclizationcatalyzed by a Lewis acid was achieved using a cyclic enol carbonate bearing a cyclopropane moiety as a substrate. Various substrates were converted into the corresponding multi-substituted cyclohexenones in good yields via decarboxylation, followed by 6-membered ring formation involving cyclopropane-ring-opening.
Durch basekatalysierte Reaktion zwischen aromatischen Aldehyden und 3‐Methyl‐2‐butanon in wäßrig‐ethanolischer Lösung bei 70° konnten die 5‐Aryl‐3‐isopropyl‐6,6‐dimethyl‐2‐cyclohexenone 4a‐f dargestellt werden. Benzaldehyd und Butanon reagierten analog; zwei der vier möglichen, in schlechter Ausbeute anfallenden 5‐Aryl‐2‐cyclohexenone 6 waren als Oxime zu isolieren.
Durch basekatalysierte Reaktion zwischenarotischen Aldehyden 和 3-Methyl-2-butanon in wäßrig-ethanolischer Lösung bei 70° konnten die 5-Aryl-3-isopropyl-6,6-dimethyl-2-cyclohexenone 4a-f dargestellt werden Benzaldehyd 和 Butanon reagierten 类似物;zwei der vier möglichen, in schlechter Ausbeute anfallenden 5-Aryl-2-cyclohexenone 6waren als Oxime zu isolieren。
Stereoconvergent Direct Ring Expansion of Cyclopropyl Ketones to Cyclopentanones
作者:Jiru Shao、Yue Fu、Sunewang R. Wang
DOI:10.1021/acs.orglett.3c00025
日期:2023.1.27
Recyclization of the ring-opening species of alkyl cyclopropyl ketones to cyclopentanones, which proceeds through an unfavored 5-endo-trig cyclization predicted by Baldwin’s rules, is elusive. Herein, as assisted by a strong aryl donor and the Thorpe–Ingold strain on a quaternary cyclopropyl center, stereoconvergent direct ringexpansion of cyclopropyl ketones to cyclopentanones promoted by TfOH or BF3·Et2O is