scholarly journals Aldol Addition-Cyclization Reaction Cascade on a Platform of Chiral Ni(II) Complex of Glycine Schiff Base

2021 ◽  
Vol 16 (1) ◽  
pp. 3-9
Author(s):  
Yupiao Zou ◽  
Zizhen Yin ◽  
Haibo Mei ◽  
Hiroyuki Konno ◽  
Hiroki Moriwaki ◽  
...  
Keyword(s):  
Schiff Base ◽  
Cyclization Reaction ◽  
New Type ◽  
Subsequent Cyclization ◽  
Aldol Addition

Using platform of a new type of chiral Ni(II) complex of glycine Schiff base we designed addition-cyclization reaction cascade to explore aspects of kinetic/thermodynamic formation of the corresponding (S)(2S,3S)/(S)(2S,3R) diastereomers. It was found that the final lactone products reflect the thermodynamic stereocontrol due to much greater rates of the reversible aldol addition vs. subsequent cyclization step. The observed 4/1 (S)(2S,3S)/(S)(2S,3R) diastereoselectivity in the reactions of new type of (S)-Ni(II) complexes constitute an improvement over the previously reported 1.7/1 ratio.

Synthesis, Crystal Structures, and Nonlinear Optical (NLO) Properties of New Schiff-Base Nickel(II) Complexes. Toward a New Type of Molecular Switch?

2005 ◽  
Vol 44 (6) ◽  
pp. 1973-1982 ◽  
Author(s):  
Jean Pierre Costes ◽  
Jean François Lamère ◽  
Christine Lepetit ◽  
Pascal G. Lacroix ◽  
Françoise Dahan ◽  
...  
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Nonlinear Optical ◽  
Molecular Switch ◽  
Nlo Properties ◽  
New Type

A coumarin chalcone ratiometric fluorescent probe for hydrazine based on deprotection, addition and subsequent cyclization mechanism

2019 ◽  
Vol 55 (99) ◽  
pp. 14980-14983 ◽  
Author(s):  
Miaomiao Xing ◽  
Kangnan Wang ◽  
Xiangwen Wu ◽  
Shuyue Ma ◽  
Duxia Cao ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Fluorescent Probe ◽  
Levulinic Acid ◽  
Terminal Group ◽  
Cyclization Reaction ◽  
Chalcone Derivative ◽  
Subsequent Cyclization ◽  
Ratiometric Fluorescent Probe

A coumarin chalcone derivative with a levulinic acid terminal group acts as a ratiometric fluorescent probe for hydrazine based on deprotection, addition and a subsequent cyclization reaction mechanism.

A lanthanide(iii) dodecanuclear structure with a acylhydrazone Schiff-base ligand: slow magnetic relaxation and magnetocaloric effects

CrystEngComm ◽  
2020 ◽  
Vol 22 (44) ◽  
pp. 7623-7627
Author(s):  
Wei Wang ◽  
Jing Zhang ◽  
Ji-Hai Zhao ◽  
Yuan-Chun He ◽  
Meng-Ting Li ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Magnetic Relaxation ◽  
Synthesis Process ◽  
Magnetic Dynamics ◽  
Slow Magnetic Relaxation ◽  
New Type

In the complex synthesis process, the design of new type structures of lanthanide clusters with high nuclearity provides an opportunity to understand the nature of magnetic dynamics.

Enantioselective intramolecular cyclization of alkynyl esters catalyzed by a chiral Brønsted base

2016 ◽  
Vol 52 (33) ◽  
pp. 5726-5729 ◽  
Author(s):  
Azusa Kondoh ◽  
Hoa Thi Quynh Tran ◽  
Kyoko Kimura ◽  
Masahiro Terada
Keyword(s):  
Schiff Base ◽  
Intramolecular Cyclization ◽  
Cyclization Reaction ◽  
Base Catalyst ◽  
Chiral Schiff Base ◽  
Brønsted Base

An enantioselective intramolecular cyclization reaction of alkynyl esters was developed, which employs a Brønsted base catalyst generated in situ from a chiral Schiff base and t-BuOK.

scholarly journals Synthesis and Cytotoxicity Study of Some Acetylisatins and Diazobiphenyls

1970 ◽  
Vol 9 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Mohammad Mamun Hossain ◽  
Sakanta Kumar Shaha ◽  
Foysal Aziz ◽  
Rahat Khan ◽  
Md Mahabub Hossain
Keyword(s):  
Schiff Base ◽  
Key Words ◽  
Brine Shrimp ◽  
Heterocyclic Compounds ◽  
Cytotoxic Effect ◽  
Cyclization Reaction ◽  
Ring Cleavage ◽  
Anticancer Activities ◽  
Brine Shrimp Lethality ◽  
Anti Inflammatory

Nitrogenous heterocyclic compounds, oxindoles especially isatins and related heterocyles have excellent antifungal, anti-inflammatory, antimicrobial and anticancer activities. Oxindoles keto lactams (1-3) were synthesized according to modified Sandmayer method and their N-acetylated compounds (4-6) gave diazo-biphenyls (7-10) through ring cleavage and consequent cyclization reaction. Bis-amide (11), and Schiff-base (12) were synthesized from oxindoles respectively. The investigation of cytotoxicity of the synthesized compounds was carried out against brine shrimp lethality bioassay. In our present investigation some of the synthesized compounds such as halogen substituted acetylisatins (4-6) and the ring extended diazo-biphenyls, (7-10) have been shown to exhibit strong cytotoxic effect. Key words: diazo-biphenyls; oxindoles; cytotoxicity; brine shrimp DOI: 10.3329/dujps.v9i1.7423Dhaka Univ. J. Pharm. Sci. 9(1): 1-6, 2010 (June)

Syntheses, crystal structures, magnetochemistry and catechol oxidase activity of a tetracopper(ii) compound and a new type of dicopper(ii)-based 1D coordination polymer

2017 ◽  
Vol 41 (11) ◽  
pp. 4689-4701 ◽  
Author(s):  
Leena Mandal ◽  
Shuvankar Mandal ◽  
Sasankasekhar Mohanta
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Oxidase Activity ◽  
Catechol Oxidase ◽  
Tetranuclear Cluster ◽  
One Dimensional ◽  
1D Coordination Polymer ◽  
New Type

One phenoxo–hydroxo bridged tetranuclear cluster and one phenoxo-µ1,1-azido-µ1,3-azido bridged one-dimensional coordination polymer of copper(ii) derived from a Schiff base ligand are described.

Schiff-base -ate derivatives with main group metals: generation of a tripodal aluminate metalloligand

2018 ◽  
Vol 47 (18) ◽  
pp. 6499-6506 ◽  
Author(s):  
Francisco M. García-Valle ◽  
Vanessa Tabernero ◽  
Tomás Cuenca ◽  
Jesús Cano ◽  
Marta E. G. Mosquera
Keyword(s):  
Schiff Base ◽  
Alkali Metal ◽  
Strong Influence ◽  
Main Group ◽  
Final Outcome ◽  
Main Group Metals ◽  
New Type

A new type of -ate derivatives is described, where the alkali metal exerts a strong influence on the final outcome.

scholarly journals Template Synthesis of New Type of Macrocyclic Molecule Derived from Pyridine-2, 6-decarboxaldehyde and 1,2-bis(2-Aminoethoxy) Ethane

2011 ◽  
Vol 35 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Md Mahbubul Alam
Keyword(s):  
Schiff Base ◽  
Template Synthesis ◽  
Metal Source ◽  
Metal Free ◽  
Esi Ms ◽  
Template Condensation ◽  
New Type ◽  
Academy Of Sciences

The cyclic (2+2) template condensation of pyridine-2,6-dicarboxaldehyde with 1,2-bis(2- aminoethoxy) ethane using Pb(SCN)2 as the metal source gave dinuclear lead (II) complex, Pb2L1(SCN)4 (1), where L1 is tetra-Schiff-base macrocycle. Treatment of 1 with NaBH4 in methanol gave a metal-free reduced macrocycle L2 which has been characterized by 1HNMR and ESI-MS spectroscopy.DOI: http://dx.doi.org/10.3329/jbas.v35i1.7971Journal of Bangladesh Academy of Sciences, Vol.35, No.1, 61-65, 2011

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