Unexpected Reaction of Dimethyl Acetylenedicarboxylate with in Situ Generated Arylketenes Catalyzed by 1-Methylimidazole

2005 ◽  
Vol 7 (11) ◽  
pp. 2125-2127 ◽  
Author(s):  
Hanfeng Ding ◽  
Cheng Ma ◽  
Yewei Yang ◽  
Yanguang Wang
Keyword(s):  
Dimethyl Acetylenedicarboxylate ◽  
Unexpected Reaction

A [3+2] cycloaddition reaction for the synthesis of spiro[indoline-3,3′-pyrrolidines] and evaluation of cytotoxicity towards cancer cells

2019 ◽  
Vol 43 (23) ◽  
pp. 8903-8910 ◽  
Author(s):  
Ying Huang ◽  
Yi-Xin Huang ◽  
Jing Sun ◽  
Chao-Guo Yan
Keyword(s):  
Cancer Cells ◽  
Cycloaddition Reaction ◽  
Azomethine Ylides ◽  
Dimethyl Acetylenedicarboxylate ◽  
New Type

A new type of azomethine ylides, which was in situ generated by the reaction of ethyl glycinate hydrochloride and dimethyl acetylenedicarboxylate, reacted with 3-phenacylideneoxindoline-2-ones in ethanol to give polysubstituted spiro[indoline-3,3′-pyrrolidines] in good yields.

scholarly journals Reaction of Acyl Chlorides withIn SituFormed Zinc Selenolates: Synthesis of SelenoestersversusRing-Opening Reaction of Tetrahydrofuran

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Gemma Bellino ◽  
Marialaura Scisciani ◽  
Jaqueline Pinto Vargas ◽  
Luca Sancineto ◽  
Luana Bagnoli ◽  
...  
Keyword(s):  
Acyl Chlorides ◽  
Unexpected Reaction

Attempting to apply thein situproduction of PhSeZnSePh to the synthesis of selenoesters, an unexpected reaction involving the solvent (tetrahydrofuran) was observed and studied. We reported here some evidences about the mechanism and the possibility to control the chemoselectivity of this new reaction that afforded the formation of interesting selenoderivatives in which the selenium moiety and the carboxylic one are spaced by four carbon units.

scholarly journals Photosensitizer-Promoted Photoaddition Reactions of α-Silyl Group Containing N-Alkyl Glycinates to Dimethyl Acetylenedicarboxylate (DMAD)

2019 ◽  
Author(s):  
Suk Hyun Lim ◽  
Dae Won Cho
Keyword(s):  
Azomethine Ylides ◽  
Reaction Pathways ◽  
Secondary Amines ◽  
Dimethyl Acetylenedicarboxylate ◽  
Competitive Reaction ◽  
Silyl Group ◽  
Product Distributions ◽  
Structural Nature ◽  
Alkyl Glycinates

Photosensitizer-promoted photoaddition reactions of N-α-trimethylsilyl-N-alkylglycinates with DMAD were conducted to explore the scope of glycinate substrates and how product distributions can be influenced by structural nature of glycinates. The results show that two competitive reaction pathways are involved, in which one route is cycloaddition of in situ formed azomethine ylides to DMAD to generate pyrroles and the other is Michael addition of in situ generated secondary amines to DMAD to produce enamino-esters. Importantly, product distributions patterns are dependent on structural nature of glycinates and kinds of photosensitizers. Especially, photoaddition reaction of cyclic glycinate took place chemoselectively to produce pyrrole adduct.

1,3-Dipolar Cycloaddition Reactions of the Ylide Derived from 6-Phenacyl-benzo[f][1,7]naphthyridinium Bromide

1999 ◽  
Vol 52 (2) ◽  
pp. 149 ◽  
Author(s):  
Grazyna Matusiak
Keyword(s):  
Maleic Anhydride ◽  
Methyl Methacrylate ◽  
Methacrylic Acid ◽  
Basic Medium ◽  
Dipolar Cycloaddition ◽  
Cycloaddition Reactions ◽  
Dimethyl Acetylenedicarboxylate ◽  
Methyl Vinyl ◽  
Acid Methyl

The 1,3-dipolar cycloaddition reactions of 4,6-diazaphenanthrene 6-phenacylide formed in situ from the quaternary 6-phenacylbenzo[f][1,7]naphthyridinium bromide in basic medium were examined; methacrylic acid, methyl methacrylate, butyl vinyl ether, methyl vinyl ketone, maleic anhydride and dimethyl acetylenedicarboxylate were used as the dipolarophiles.

An Unexpected Reaction Between 6,7-Dimethoxy-2H-1,3-benzothiazine and Dimethyl Acetylenedicarboxylate

2005 ◽  
Vol 137 (2) ◽  
pp. 231-234 ◽  
Author(s):  
Lajos Fodor ◽  
Gábor Bernáth ◽  
Pál Sohár ◽  
Diether Gröschl ◽  
Herbert Meier
Keyword(s):  
Dimethyl Acetylenedicarboxylate ◽  
Unexpected Reaction

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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