2161-40-2Relevant academic research and scientific papers
THE EFFECT ON THE BASE STRENGTHS OF TROPONE AND 2-ALKOXYTROPONES OF ?-COMPLEXATION WITH A Cr(CO)3 GROUP
Lal, Kasturi,Leckey, Nigel T.,Watts, William E.
, p. 193 - 198 (1983)
?-Complexation of tropone and its 2-methoxy and 2-ethoxy derivatives with a Cr(CO)3 group causes an increase in the ketonic base strength by 1.7 +/- 0.3 pK units.
Fungicidal activity of β-thujaplicin analogues
Baya, Mounir,Soulounganga, Patrice,Gelhaye, Eric,Grardin, Philippe
, p. 833 - 838 (2001)
The fungicidal activity of analogues of β-thujaplicin, a natural product responsible for the durability of heartwood of several cupressaceous trees, was investigated in vitro on the growth of different white and brown rot fungi involved in wood biodegradation, Coriolus versicolor, Phanerochaete chrysosporium, Poria placenta and Gloephyllum trabeum. The study shows that 2-hydroxycyclohepta-2,4,6-trienone (tropolone), easily prepared according to a literature procedure, possesses interesting fungicidal activity when compared to β-thujaplicin, azaconazole, tebuconazole and copper oxine, which suggests this compound should be examined further as a potential biocide for wood preservation.
Electrochemical methoxylation of 1,2,3-trisubstituted azulenes
Chen, Arh-Hwang
, p. 35 - 39 (1999)
1,2,3-Trisubstituted azulene analogs 6a and 6b easily underwent methoxylation in position 4 or 6 of an azulene ring via an electrochemical oxidation. It is a simple, convenient and selective method for introducing a methoxy group into a 7-membered ring of azulene analogs when compared with traditional chemical methods. It could be useful in preparing 2,4- and 2,6-azuloquinone analogs.
Tropolonyl ethers of saccharides and cyclitol derivatives
Houte, Henri,Valnot, Jean-Yves,Piettre, Serge R.
, p. 9217 - 9220 (2002)
Mitsunobu coupling between tropolones and saccharide or cyclitol derivatives featuring primary or secondary alcohol functions provides for the first time an easy, general and efficient access to the corresponding tropolonyl ethers. Selective deprotection of the carbohydrate or cyclitol units demonstrates that naked saccharides and cyclitols bearing a tropolonyl ether moiety may be prepared by this route.
AMBIPHILIC REACTIVITY OF 1,1-DIMETHOXYACETONE
Murray, Desmond H.,Albizati, Kim F.
, p. 4109 - 4112 (1990)
Trialkylsilyloxyallyl cations 2 with a ?-donating methoxy substituent at the allylic termini are generated from nonhalogenated substrates via treatment of 5b-e with Lewis acids. 2 undergoes stereo- and regioselective cycloaddition with furans yielding 2-methoxy-8-oxabicyclooct-6-en-3-ones.Cycloadduct 7 is converted to 2-methoxytropone 14 and thus represents an efficient entry into tropolonoid systems.
HINOKITIOL ANALOGUES, METHODS OF PREPARING AND PHARMACEUTICAL COMPOSITIONS THEREOF
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Page/Page column 211, (2019/11/04)
Disclosed are analogues of hinokitiol, methods for preparing them, and pharmaceutical compositions thereof. Also disclosed are methods for their use in treating iron-related diseases.
Protonation behaviour of 2-phenyl-1,3-diazaazulene derivatives
Sun, Peili,Rao, Danling,Zhang, Pu,Qin, Yujun,Guo, Zhi-Xin
, p. 731 - 739 (2018/01/09)
Three 2-phenyl-1,3-diazaazulene derivatives were synthesized and their protonation behaviours were investigated systematically via UV–vis absorption titration and 1H NMR titration, as well as theoretical calculations. One of them exhibited a monoprotonation process while the others displayed prominent halochromic diprotonation responses. Interestingly, upon protonation of 2-phenyl-1,3-diazaazulene derivatives, the coplanarity and conjugation of the 16-π-conjugated backbones were well kept, while the electronic structures were controllably adjusted. The response mechanism of 1,3-diazaazulene derivatives towards acid is through the attachment of acid proton to the nitrogen atom in the diazaazulene ring, resulting in the change of the hybridization of protonated-N from sp2 to sp3, which differed from that of the well-known azulene (analogue of 1,3-diazaazulene, protonation at carbon atom). This work would provide a new insight into the protonation research of the organic functional molecules.
Synthesis, crystal structure and photophysical properties of 1,4-bis(1,3-diazaazulen-2-yl)benzene: A new π building block.
Sun, Peili,Zhang, Zongyao,Luo, Hongxia,Zhang, Pu,Qin, Yujun,Guo, Zhi-Xin
, p. 171 - 176 (2018/02/14)
A dimerized 1,3-diazaazulene derivative, namely 1,4-bis(1,3-diazaazulen-2-yl)benzene [or 2,2′-(1,4-phenylene)bis(1,3-diazaazulene)], C22H14N4, (I), has been synthesized successfully through the condensation reaction betwee
Thiocarbonyl Ylide Chemistry Enables a Concise Synthesis of (±)-Hippolachnin A
Winter, Nils,Trauner, Dirk
supporting information, p. 11706 - 11709 (2017/09/08)
Hippolachnin A (1) is an antifungal polyketide that bristles with ethyl groups mounted onto a caged heterotricyclic core. It has shown potent activity against Cryptococcus neoformans, a yeast that can affect immunocompromised patients as an opportunistic pathogen. Herein we describe a concise, diversifiable, and scalable synthesis of (±)-hippolachnin A (1). It features a powerful photochemical opening step, a diastereoselective addition of an ethyl cuprate and an unusual strategy to install two additional ethyl groups that makes use of a thiocarbonyl ylide generated in situ.
COMPOSITIONS AND METHODS FOR INHIBITING INFLUENZA RNA POLYMERASE PA ENDONUCLEASE
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Paragraph 0584, (2017/09/27)
There are provided inter alia metalloenzyme inhibitors, such as inhibitors of influenza A RNA dependent RNA polymerase PA subunit endonuclease, and methods of synthesis and use of the same.
