Results 11 to 20 of about 10,845 (167)

Catalytic Asymmetric Synthesis of gem‐Dicyano‐Spirocyclopropyl Oxindoles by N‐9‐Anth‐PyBidine‐Co(OAc)2: Advantage of Three‐Component Coupling Approach

ChemistryEurope
A chiral N‐9‐Anth‐PyBidine‐Co(OAc)2 complex catalyzed the kinetically controlled asymmetric Michael/alkylation reaction of 3‐chlorooxindoles with alkylidenemalononitriles to give gem‐dicyano‐spirocyclopropyl oxindoles in a highly diastereo‐ and ...
Takaaki Saito, Ren Miyasaka, Kazumasa Kon, Yuri Takagi, Takayoshi Arai   +4 more
doaj   +2 more sources

The Synthesis of Single Enantiomers of α-Mycolic Acids of Mycobacterium­ tuberculosis and Related Organisms, with Alternative­ Cyclopropane Stereochemistries

SynOpen, 2017
We report the synthesis of three stereoisomers of a mycolic acid from Mycobacterium tuberculosis containing a di-cis-cyclopropane and of two stereoisomers of a mycolic acid containing a proximal trans-cyclopropane and a distal cis-cyclopropane.
Chioma Don Lawson, Max Maza-Iglesias, Muthana M. Sirhan, Jumaa R. Al Dulayymi, Mark S. Baird   +4 more
doaj   +1 more source

Antiviral Cyclopropane Acids from Deep-Sea-Derived Fungus Aspergillus sydowii

Marine Drugs, 2022
Four novel monocyclic cyclopropane acids, namely, sydocyclopropanes A–D (1–4), along with one known congener hamavellone B (5), were isolated from the Aspergillus sydowii MCCC 3A00324 fungus, which was isolated from the deep-sea sediment.
Siwen Niu, Shuhuan Huang, Bihong Hong, Qixi Huang, Xiupian Liu, Zongze Shao, Gaiyun Zhang   +6 more
doaj   +1 more source

Oxidative radical ring-opening/cyclization of cyclopropane derivatives

Beilstein Journal of Organic Chemistry, 2019
The ring-opening/cyclization of cyclopropane derivatives has drawn great attention in the past several decades. In this review, recent efforts in the development of oxidative radical ring-opening/cyclization of cyclopropane derivatives, including ...
Yu Liu, Qiao-Lin Wang, Zan Chen, Cong-Shan Zhou, Bi-Quan Xiong, Pan-Liang Zhang, Chang-An Yang, Quan Zhou   +7 more
doaj   +1 more source

3,4,5,6,7,8,9-Heptachlorophenaleno[1,9-bc]pyrazole

Molbank, 2009
Treatment of perchloro-7H-cyclopropano[a]acenaphthylene 1 with hydrazine hydrate in DMF at ca. 80 °C gives the new 3,4,5,6,7,8,9-heptachlorophenaleno[1,9-bc]pyrazole 2 in 69% yield. This compound is the first example of a phenalene fused pyrazole.
Polina K. Demetriadou, Panayiotis A. Koutentis   +1 more
doaj   +1 more source

On the Discorhabdins Leading to the Aleutianamine Ring System: A One‐Step in Situ Transformation Characterized Through Computational and Experimental Studies and Its Implications on Biosynthesis, Synthesis, and Pharmacology

Angewandte Chemie, EarlyView.
The thiocarbenium ion rearrangement of 3‐dihydrodisorhabdin B greatly increases the recovery of aleutianamine from Latrunculia spp., a pyrroloiminoquinone natural product with potent activity against drug‐resistant cancers, collected from the deep‐ocean along the Aleutian Islands.
Cody F. Dickinson, Abhay Potluri, Alison M. Bland, Samuel M. Flipse, George S. Hanna, Ryan T. Wagner, Keith D. Robertson, Thai H. Ho, Daniel J. Sprague, Gerald R. Hoff, Robert P. Stone, Marcus A. Tius, Dean J. Tantillo, Mark T. Hamann   +13 more
wiley   +2 more sources

Um estudo teórico de propriedades moleculares em complexos de hidrogênio trimoleculares C2H4···2HF, C2H2···2HF e C3h6···2HF A theoretical study of molecular properties of C2H4···2HF, C2H2···2HF AND C3H6···2HF trimolecular hydrogen-bonded complexes

Química Nova, 2008
We present a theoretical study of molecular properties in C2H4···2HF, C2H2···2HF and C3H6···2HF trimolecular hydrogen-bonded complexes. From B3LYP/6-311++G(d,p) calculations, the most important structural deformations are related to the C=C (C2H4), C ...
Boaz G. Oliveira, Regiane C. M. U. Araújo, Flávia S. Pereira, Emmanuela F. Lima, Washington L. V. Silva, Antônio B. Carvalho, Mozart N. Ramos   +6 more
doaj   +1 more source

Synthesis of New Spiro-Cyclopropanes Prepared by Non-Stabilized Diazoalkane Exhibiting an Extremely High Insecticidal Activity

Molecules, 2022
The synthesis of new insecticidal gem-dimethyspiro-cyclopropanes derived from pyrrolidine-2,3-dione have been described, and their biological effect against different insect species has been evaluated.
Naoufel Ben Hamadi, Ahlem Guesmi
doaj   +1 more source

Crystal structure of cis-2-(2-carboxycyclopropyl)glycine (CCG-III) monohydrate

Acta Crystallographica Section E: Crystallographic Communications, 2015
The title compound, C6H9NO4·H2O [systematic name: (αR,1R,2S)-rel-α-amino-2-carboxycyclopropaneacetic acid monohydrate], crystallizes with two organic molecules and two water molecules in the asymmetric unit.
Sergey Lindeman, Nathaniel J. Wallock, William A. Donaldson   +2 more
doaj   +1 more source

New Anti-Infective Preparations of Naphthyloxypropargylpiperidine Series

Eurasian Chemico-Technological Journal, 2017
1-Alkyl-4-(3-naphthyloxyprop-1-ynyl)piperidine-4-ols have been obtained by the condensation of 1-alkyl-pipieridin-4-ones with 1- and 2-naphthoxypropines by the Favorsky method in absolute diethylether, in the presence of powered technical KОН, under ...
F. M. Sadyrbayeva, G. S. Akhmetova, K. D. Praliyev, H. Osman, N. V. Korotetskaya   +4 more
doaj   +1 more source