Results 21 to 30 of about 11,171 (165)

Microbial Transformation of neo-Clerodane Diterpenoid, Scutebarbatine F, by Streptomyces sp. CPCC 205437

Frontiers in Microbiology, 2021
Biotransformation of the neo-clerodane diterpene, scutebarbatine F (1), by Streptomyces sp. CPCC 205437 was investigated for the first time, which led to the isolation of nine new metabolites, scutebarbatine F1–F9 (2–10). Their structures were determined
Dewu Zhang, Xiaoyu Tao, Guowei Gu, Yujia Wang, Wenxia Zhao, Wuli Zhao, Yan Ren, Shengjun Dai, Liyan Yu   +8 more
doaj   +1 more source

Synthesis of spiro quasi[1]catenanes and quasi[1]rotaxanes via a templated backfolding strategy

Nature Communications, 2017
Spiro compounds contain two or more rings linked together through one common atom. Here the authors provide a method to backfold both rings, producing spiro quasi[1]catenanes, via a strategy of temporarily linking the linear intermediates with covalent ...
Luuk Steemers, Martin J. Wanner, Martin Lutz, Henk Hiemstra, Jan H. van Maarseveen   +4 more
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(±)-Peniorthoesters A and B, Two Pairs of Novel Spiro-Orthoester en-antiomers With an Unusual 1,4,6-Trioxaspi-ro[4.5]decane-7-One Unit From Penicillium minioluteum

Frontiers in Chemistry, 2018
(±)-Peniorthoesters A and B (±1 and ±2), two pairs of unprecedented spiro-orthoester enantiomers with a 1,4,6-trioxaspiro[4. 5]decane-7-one unit, were obtained from Penicillium minioluteum. Their structures were determined by spectroscopic methods, X-ray
Xiaorui Liu, Chunmei Chen, Yinyu Zheng, Mi Zhang, Qingyi Tong, Junjun Liu, Qun Zhou, Jianping Wang, Zengwei Luo, Hucheng Zhu, Yonghui Zhang   +10 more
doaj   +1 more source

Spiro Cyclohexadienones from the Reaction of Phenolic Enaminone Derivatives with Hypervalent Iodine Reagents

Molecules, 2000
Phenolic enamino compounds, prepared from 2-(4-hydroxyphenyl)-ethylamine and the corresponding β-keto carbonyl compounds, afford spiro cyclohexadienone derivatives on reaction with hypervalent iodine reagents.
Anastasios Varvoglis, Spyros Spyroudis, Ioannis Papoutsis, Anna Asmanidou   +3 more
doaj   +1 more source

Peniciadametizine A, a Dithiodiketopiperazine with a Unique Spiro[furan-2,7'-pyrazino[1,2-b][1,2]oxazine] Skeleton, and a Related Analogue, Peniciadametizine B, from the Marine Sponge-Derived Fungus Penicillium adametzioides

Marine Drugs, 2015
Peniciadametizine A (1); a new dithiodiketopiperazine derivative possessing a unique spiro[furan-2,7'-pyrazino[1,2-b][1,2]oxazine] skeleton, together with a highly oxygenated new analogue, peniciadametizine B (2); as well as two known compounds ...
Yang Liu, Attila Mándi, Xiao-Ming Li, Ling-Hong Meng, Tibor Kurtán, Bin-Gui Wang   +5 more
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Facile, Regio- and Diastereoselective Synthesis of Spiro-Pyrrolidine and Pyrrolizine Derivatives and Evaluation of Their Antiproliferative Activities

Molecules, 2014
A number of novel spiro-pyrrolidines/pyrrolizines derivatives were synthesized through [3+2]-cycloaddition of azomethine ylides with 3,5-bis[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones 2a–n.
Abdulrahman I. Almansour, Raju Suresh Kumar, Farzana Beevi, Amir Nasrolahi Shirazi, Hasnah Osman, Rusli Ismail, Tan Soo Choon, Brian Sullivan, Kellen McCaffrey, Alaa Nahhas, Keykavous Parang, Mohamed Ashraf Ali   +11 more
doaj   +1 more source

The synthesis of novel spirocyclic N-aryl-substituted 2-thiopyrimidine-4,6-diones

Журнал органічної та фармацевтичної хімії, 2019
A convenient and efficient method for the synthesis of new unsaturated spiro-annulated N-aryl-4,6-dioxopyrimidine-2-thione derivatives has been developed.
N. I. Kobyzhcha, V. M. Holovatiuk, V. V. Rozhkov, V. I. Kashkovsky   +3 more
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CXIX.—The formation and stability of spiro-compounds. Part I. spiro-Compounds from cyclohexane [PDF]

J. Chem. Soc., Trans., 1915
n ...
Beesley, Richard Moore, Ingold, Christopher Kelk, Thorpe, Jocelyn Field   +2 more
openaire   +1 more source

Studies on the Enantioselective Synthesis of E-Ethylidene-bearing Spiro[indolizidine-1,3′-oxindole] Alkaloids

Molecules, 2021
A synthetic route for the enantioselective construction of the tetracyclic spiro[indolizidine-1,3′-oxindole] framework present in a large number of oxindole alkaloids, with a cis H-3/H-15 stereochemistry, a functionalized two-carbon substituent at C-15 ...
Nihan Yayik, Maria Pérez, Elies Molins, Joan Bosch, Mercedes Amat   +4 more
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Synthesis & Characterization of Oxazinan and 5-oxa-7-aza-spiro[2,5] octane from reaction of Dibenzylidene with malonic anhydride and 5-oxa-spiro[2,3] hexane-4,6-dione.

مجلة بغداد للعلوم, 2007
Di Benzylidenes were prepared by condensation of 1,2-diamino benzene with o- hydroxy benzaldehyde. These dibenzylidenes when treated with one equivalent of malonic anhydride or 5-oxo-spiro[2,3]hexane-4,6-dione in dry benzene give 6-membered heterocyclic
Baghdad Science Journal
doaj   +1 more source