[4 + 1] annulation reaction of cyclic pyridinium ylides with in situ generated azoalkenes for the construction of spirocyclic skeletons

2020 ◽  
Vol 18 (10) ◽  
pp. 1886-1891 ◽  
Author(s):  
Bao-Xue Quan ◽  
Jun-Rui Zhuo ◽  
Jian-Qiang Zhao ◽  
Ming-Liang Zhang ◽  
Ming-Qiang Zhou ◽  
...  
Keyword(s):  
Pyridinium Ylides ◽  
Spirocyclic Compounds

Two new kinds of cyclic pyridinium ylides have been firstly designed and used in reactions with in situ generated azoalkenes to access spirocyclic compounds via a [4 + 1] annulation process.

Catalyst free Synthesis of Highly Functionalized Indolizines from In Situ Generated Pyridinium Ylides via One‐Pot Multicomponent Reaction

2019 ◽  
Vol 4 (13) ◽  
pp. 3717-3721 ◽  
Author(s):  
Vediyappan Ramesh ◽  
Natarajan Savitha Devi ◽  
Marappan Velusamy ◽  
Sivakumar Shanmugam
Keyword(s):  
Multicomponent Reaction ◽  
One Pot ◽  
Catalyst Free ◽  
Pyridinium Ylides

Cu(OAc)2–Et3N mediated oxidative coupling of α-azido ketones with pyridinium ylides: utilizing in situ generated imines for regioselective synthesis of imidazo[1,2-a]pyridines

2015 ◽  
Vol 51 (52) ◽  
pp. 10475-10478 ◽  
Author(s):  
Ahmed Kamal ◽  
Chada Narsimha Reddy ◽  
Malasala Satyaveni ◽  
D. Chandrasekhar ◽  
Jagadeesh Babu Nanubolu ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Regioselective Synthesis ◽  
One Pot ◽  
Pyridinium Ylides

Imidazo[1,2-a]pyridines are synthesized via Cu(OAc)2–Et3N mediated one-pot coupling of pyridines, α-bromo ketones and α-azido ketones.

Copper-mediated oxidative [3 + 2]-annulation of nitroalkenes and pyridinium ylides: general access to functionalized indolizines and efficient synthesis of 1-fluoroindolizines

2019 ◽  
Vol 17 (6) ◽  
pp. 1442-1454 ◽  
Author(s):  
Vladimir A. Motornov ◽  
Andrey A. Tabolin ◽  
Yulia V. Nelyubina ◽  
Valentine G. Nenajdenko ◽  
Sema L. Ioffe
Keyword(s):  
Efficient Synthesis ◽  
Pyridinium Ylides

Novel 1-fluoroindolizines were obtained via copper(ii)-mediated oxidative [3 + 2]-annulation of in situ generated pyridinium ylides and fluoronitroalkenes.

ChemInform Abstract: Cu(OAc)2-Et3N Mediated Oxidative Coupling of α-Azido Ketones with Pyridinium Ylides: Utilizing in situ Generated Imines for Regioselective Synthesis of Imidazo[1,2-a]pyridines.

ChemInform ◽  
2015 ◽  
Vol 46 (44) ◽  
pp. no-no
Author(s):  
Ahmed Kamal ◽  
Chada Narsimha Reddy ◽  
Malasala Satyaveni ◽  
D. Chandrasekhar ◽  
Jagadeesh Babu Nanubolu ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Regioselective Synthesis ◽  
Pyridinium Ylides

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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