Regioselective synthesis of 1- and 4-tetralones from heteroaryl-3-cyclobutanols
作者:Philipp Natho、Annie B. Rouse、Jake L. Greenfield、Lewis A.T. Allen、Andrew J.P. White、Zeyu Yang、Philip J. Parsons
DOI:10.1016/j.tet.2020.131636
日期:2020.11
Herein we describe the first transition-metal-free ring expansion of four-membered rings to 1-tetralones from 3-substituted heteroaromatic compounds, and the first example of an oxetanol ring expansion to an oxa-tetralone. We also experimentally investigate the mechanism of the silver-mediated ring expansion and elucidate the active oxidant in these systems using electrochemical techniques.
Regioselective Electrochemical Cyclobutanol Ring Expansion to 1‐Tetralones
作者:Alessia Petti、Philipp Natho、Kevin Lam、Philip J. Parsons
DOI:10.1002/ejoc.202001535
日期:2021.2.5
A new electrochemical approach to the oxidative ringexpansion of functionalized cyclobutanols is reported. Aryl and heteroaryl 1‐tetralones are synthesized under mild and cost‐efficient conditions. The newly designed methodology proves to be tolerant of a good range of functional groups and its application to larger scale syntheses is shown to be feasible.
An initial structure-activity relationship study of the novel necroptosis inhibitor Nec-21 was described. Any changes of the tetracyclic scaffold were detrimental for the activity. Introduction of a substituent to 7 or 8 position (e.g., cyano or methoxy group, respectively), would increase the activity. The 7 and 8-position disubstituted compound 17b was 35-fold as potent as the lead, while EC50 reached 14 nM. (C) 2013 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of 1- and 4-Hydroxytetrahydrocarbazoles through Asymmetric Transfer Hydrogenation
作者:Erkan Ertürk、Ömer Dilek、Süleyman Patir
DOI:10.1055/s-0037-1610351
日期:2019.1
the corresponding 1- and 4-oxotetrahydrocarbazoles through asymmetrictransferhydrogenation by using the commercially available Noyori–Ikariya ruthenium catalyst. The immediate use of the freshly prepared catalyst and the use of a HCO2H–DABCO (11:6) mixture as the hydrogen source are crucial for achieving high activity and enantioselectivity. In this way, a tetrahydrocarbazole heterocycle fused to a
Access to Diverse Oxygen Heterocycles via Oxidative Rearrangement of Benzylic Tertiary Alcohols
作者:Brandon T. Kelley、Jennifer C. Walters、Sarah E. Wengryniuk
DOI:10.1021/acs.orglett.6b00672
日期:2016.4.15
A facile method for the synthesis of challenging medium-sized cyclic ethers has been developed via a novel oxidative rearrangement of benzylic tertiaryalcohols. The reaction provides access to cyclic acetals with diverse substitution at both C2 and the aromatic ring. The unique reactivity is enabled by poly(cationic) hypervalent iodine reagents and represents the first synthetic application of this