Rapid Access to Amino-Substituted Quinoline, (Di)Benzofuran, and Carbazole Heterocycles through an Aminobenzannulation Reaction
作者:Martin Tiano、Philippe Belmont
DOI:10.1021/jo800249f
日期:2008.6.1
quinolines, dibenzofurans, and carbazoles. The precursors are heterocycles bearing a methyl ketone group ortho to an internal alkyne. They are commercially available or can be obtained in three to four classical and efficient reactions: Vilsmeier−Haack, Sonogashira (diversity point), Grignard, and Ley’s oxidation. Upon aminobenzannulation reaction—classical conditions being pyrrolidine neat or in a solvent
An approach to the synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups
作者:Andrii I. Subota、Sergey V. Ryabukhin、Alina O. Gorlova、Oleksandr O. Grygorenko、Dmitriy M. Volochnyuk
DOI:10.1016/j.jfluchem.2019.05.006
日期:2019.8
synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups was proposed. The method was based on the DAST-mediated nucleophilic fluorination of easily available 2-bromopyridin-3-yl alcohols and ketones affording 2-bromo-3-(1-fluoroalkyl)pyridines and 2-bromo-3-(1,1-difluoroalkyl)pyridines, respectively, followed by catalytic hydrogenation. The hydrogenation step was studied with common
Approach to 5-substituted 6,7,8,9-tetrahydro-5 H -pyrido[3,2- c ]azepines
作者:Andrii I. Subota、Oleksiy S. Artamonov、Alina Gorlova、Dmitriy M. Volochnyuk、Oleksandr O. Grygorenko
DOI:10.1016/j.tetlet.2017.04.030
日期:2017.5
An approach to 5-substituted 6,7,8,9-tetrahydro-5H-pyrido[3,2-c]azepines via the cyclization of 1-(2-(3-azidopropyl)pyridin-3-yl)alkanones under Staudinger–aza-Wittig reaction conditions is described. The overall reaction sequence includes eight steps and allows for the preparation of gram quantities of the title products. In some cases, the formation of 5,7,8,9-tetrahydrooxepino[4,3-b]pyridine derivatives
通过在1-(2-(3-叠氮基丙基)吡啶-3-基)烷酮下环化5-取代的6,7,8,9-四氢-5 H-吡啶并[3,2- c ] a庚烷的方法描述了Staudinger-aza-Wittig反应条件。整个反应过程包括八个步骤,可以制备克量的标题产物。在某些情况下,观察到了5,7,8,9-四氢氧哌啶[4,3- b ]吡啶衍生物的形成。
Phosphine- and water-promoted pentannulative aldol reaction
作者:Bishnupada Satpathi、Lona Dutta、S. S. V. Ramasastry
DOI:10.1039/c8ob03106a
日期:——
intramolecular aldolreaction for the synthesis of an unusual class of cyclopentanoids is described. The reaction of α-substituted dienones tethered with ketones in the presence of tributylphosphine and water provided aldols. The role of water was realised to be crucial for this transformation. Furthermore, isotopic labeling experiments provided vital information about the reaction mechanism.
One-Pot Asymmetric Synthesis of Alkylidene 1-Alkylindan-1-ols Using Brønsted Acid and Palladium Catalysis
作者:Réka J. Faggyas、Ewen D. D. Calder、Claire Wilson、Andrew Sutherland
DOI:10.1021/acs.joc.7b02287
日期:2017.11.3
2-bromoaryl ketones has been developed for the asymmetric synthesis of 3-methyleneindanes bearing a tertiary alcohol center. Brønsted acid-catalyzed allylboration with a chiral BINOL derivative was followed by a palladium-catalyzed Mizoroki–Heck cyclization, resulting in selective formation of the exo-alkene. This novel protocol provides a concise and scalable approach to 1-alkyl-3-methyleneindan-1-ols