Synthesis of substituted pyrroles using a silver-catalysed reaction between isocyanoacetates/benzyl isocyanides and chromones
作者:Xueyu Qi、Haoyue Xiang、Yuhong Yang、Chunhao Yang
DOI:10.1039/c5ra21915a
日期:——
A novel synthetic strategy to construct substituted-pyrroles has been developed through silver-catalysed cycloadditions of isocyanides with chromones.
已经开发出一种新的合成策略,通过银催化的异氰酸酯与色酮的环加成反应来构建取代吡咯。
Benzol-Derivate aus 4-Pyronen: Über die Reaktion von 3,5-Diacetyl- und 3,5-Diethoxycarbonyl-4-pyronen mit sek. Aminen
作者:Fritz Eiden、Ernst-Günther Teupe、Hans Peter Leister
DOI:10.1002/ardp.19813140411
日期:——
Bei der Reaktion der 3,5‐Diacetyl‐ bzw. Diethoxycarbonyl‐pyrone 1a bzw. 1b mit sek. Aminen entstanden die Diacetyl‐ bzw. Diethoxycarbonyl‐aminophenole 4a–4m sowie in doppelter Umsetzung 21. 4g und 21 ließen sich in die Chromon‐Derivate 10 bzw. 22 überführen. 10 reagierte mit Hydrazinen zu den Pyrazolyl‐Derivaten 15a und 15b. Bei der Hydrolyse von 4k entstanden u. a. die Aminophenole 18a und 18b.
Helical Multi‐Coordination Anion‐Binding Catalysts for the Highly Enantioselective Dearomatization of Pyrylium Derivatives
作者:Theresa Fischer、Julia Bamberger、Melania Gómez‐Martínez、Dariusz G. Piekarski、Olga García Mancheño
DOI:10.1002/anie.201812031
日期:2019.3.4
A general and highlyenantioselective synthesis of oxygen heterocycles from readily available in situ generated pyrylium derivatives has been realized by embracing a multi-coordination approach with helical anion-binding tetrakistriazole catalysts. The high activity of the tetrakistriazole (TetraTri) catalysts, with distinct confined anion-binding pockets, allows for remarkably low catalyst loadings
EIDEN F.; TEUPE E.-G.; LEISTER H. P., ARCH. PHARM., 1981, 314, NO 4, 347-385
作者:EIDEN F.、 TEUPE E.-G.、 LEISTER H. P.
DOI:——
日期:——
Palladium-Catalyzed Asymmetric Conjugate Addition of Arylboronic Acids to Heterocyclic Acceptors
作者:Jeffrey C. Holder、Alexander N. Marziale、Michele Gatti、Bin Mao、Brian M. Stoltz
DOI:10.1002/chem.201203643
日期:2013.1.2
Flava Flavanone: Asymmetricconjugateadditions to chromones and 4‐quinolones are reported utilizing a single catalyst system formed in situ from Pd(OCOCF3)2 and (S)‐tBuPyOX. Notably, these reactions are performed in wet solvent under ambient atmosphere, and employ readily available arylboronicacids as the nucleophile, thus providing ready access to these asymmetric heterocycles (see scheme).