Réactivité photochimique des dialkylamino-2 cyclohexène-2 ones et des sels d'ammonium correspondants
作者:J.C. Arnould、J. Cossy、J.P. Pete
DOI:10.1016/s0040-4020(01)97941-4
日期:——
Photolysis of 2-dialkylamino-2-cyclohexenones leads to α-ketoazetidines. The reactivity of 3-methyl-2-dialkylamino-2-cyclohexenones and the effect of the nature of the dialkylamino groups on the photocyclization are discussed. Photolysis of the corresponding ammonium salts in hydroxylic solvents led only to adduct formation.
The title heterocycles rearrange into a mixture of diastereoisomeric hexahydro-1(2H)-pentalenone derivatives, which undergo nucleophiliceliminativeringfission by methanol to give 1-amino-2-nitroalkylated cyclopentancarboxylic esters. The X-ray structure determination of hexahydro-2-methyl-2-nitro-3-phenyl-6a- (1-piperidinyl) -1 (2H)-pentalenone – (2α, 3α, 3aα, 6aα) is also reported.
Probing Trends in Enantioinduction via Substrate Design: Palladium-Catalyzed Decarboxylative Allylic Alkylation of α-Enaminones
作者:Douglas C. Duquette、Alexander Q. Cusumano、Louise Lefoulon、Jared T. Moore、Brian M. Stoltz
DOI:10.1021/acs.orglett.0c01441
日期:2020.7.2
Herein, we report the palladium-catalyzeddecarboxylativeasymmetricallylicalkylation of α-enaminones. In addition to serving as valuable synthetic building blocks, we exploit the α-enaminone scaffold and its derivatives as probes to highlight structural and electronic factors that govern enantioselectivity in this asymmetricalkylation reaction. Utilizing the (S)-t-BuPHOX ligand in a variety of
Verfahren zur Herstellung von 2-Piperidino-3-hydroxyl-amino-cyclohexanonoximen
申请人:BASF Aktiengesellschaft
公开号:EP0001105A1
公开(公告)日:1979-03-21
2-Piperidino-3- hydroxylamino-cyclohexanonoxime, Verfahren zur Herstellung von 2-Piperidino-3- hydroxylamino - cyclohexanonoximen der Formel
worin die einzelnen Rest R gleich oder verschieden sein können und jeweils ein Wasserstoffatom, einen aliphatischen, cycloaliphatischen, araliphatischen oder aromatischen Rest bedeuten darüber hinaus zwei benachbarte Reste R auch zusammen mit den beiden benachbarten Kohlenstoffatomen Glieder eines Ringes bezeichnen können, durch Umsetzung von den entsprechenden 2-Piperidino-cyclohexen, -(2)-onen mit Hydroxylamin.
Die Verbindungen I stellen Komplexbildner für Schwermetallionen dar, sie sind Ausgangsstoffe für die Herstellung von Triaminen, die als alkalische Katalysatoren, Zusätze zu Epoxidharzen und als Ausgangsstoffe für die Synthese von Farbstoffen und Arzneimittel dienen.
2-哌啶基-3-羟基氨基-环己酮肟,式 2-哌啶基-3-羟基氨基-环己酮肟的制备工艺
通过相应的 2-哌啶基-环己烯-(2)-酮与羟胺反应,制备式 2-哌啶基-3-羟基氨基环己酮肟的工艺,其中各个基 R 可以相同或不同,并且各自表示一个氢原子、一个脂族基、环脂族基、芳香族基,此外,相邻的两个基 R 也可以与相邻的两个碳原子一起表示一个环的成员。
化合物 I 是重金属离子的络合剂,也是生产三胺的起始原料,可用作碱性催化剂、环氧树脂的添加剂以及合成染料和药物的起始原料。
Reactions of enaminones with 1-nitroolefins. Scope and limitations of a polyquinane synthesis
作者:John W. Huffman、Melanie M. Cooper、Barnabe B. Miburo、William T. Pennington
DOI:10.1016/s0040-4020(01)80490-7
日期:1992.1
The reaction of several 2-aminocyclohex-2-en-1-ones with cyclic nitroolefins has been explored as a possible synthetic approach to polyquinanes. 2-Pyrrolidino, 2-piperidino and 2-morpholinocyclohex-2-en-1-one react with 1-nitrocyclopentene to provide substituted triquinanes. Reactions involving 5,5-dimethyl-2-morpholinocyclohex-2-en-1-one were unsuccessful as were those using 4,4-dimethyl-1-nitrocyclopentene. 5-Methyl-2-morpholinocyclohex-2-en-1-one and 1-nitrocyclopentene provide the corresponding triquinane, plus a by-product in which the amino substituent has been lost. The reactions of other selected nitroolefins have been carried out, and the products are described. The results of these reactions are rationalized in terms of an inverse electron demand Diels-Alder reaction to afford an intermediate oxazine N-oxide, which then undergoes further transformations to afford the observed products.