88089-41-2Relevant academic research and scientific papers
Cycloaddition of Pyridinium Methylides with Electron-Deficient Olefins and Silica-Gel Mediated Elimination of Pyridines from the Cycloadducts: A New Method of Alkylation or Hydroalkylidenation of Olefins
Tsuge, Otohiko,Kanemasa, Shuji,Takenaka, Shigeori
, p. 1489 - 1496 (2007/10/02)
Pyridinium methylides bearing an anion-stabilizing substituent at the ylide carbon react with a variety of olefins carrying two electron-withdrawing groups at the both carbons such as N-substituted maleimides, a citraconimide, dimethyl maleate, dimethyl f
Stereochemical Study on 1,3-Dipolar Cycloaddition Reactions of Heteroaromatic N-Ylides with Symmetrically Substituted cis and trans Olefins
Tsuge, Otohiko,Kanemasa, Shuji,Takenaka, Shigeori
, p. 3137 - 3157 (2007/10/02)
Stereochemistry of the cycloadditions of twenty-four heteroaromatic N-ylides with several symmetrically substituted cis and trans olefins has been investigated.Cyclic and acyclic cis olefins cycloadd to the anti form of the ylides in a highly endo-selective manner giving almost quantitative yields of stereospecific endo 3+2 cycloadducts.N-Ylides stabilized with a substituent of carbonyl type react with trans olefins to form mostly two stereoisomeric 3+2 cycloadducts to the anti form of the ylides.In most cases, they undergo the stereospecific interconversion through a retro cycloaddition process, the isomer ratios and the easiness of transfromation depending upon the nature and size of substituents on the five-membered ring which has been built up in the cycloaddition step.On the other hand, N-ylides stabilized with a substituent of noncarbonyl type react with trans olefins to give stereospecific and stereoselective 3+2 cycloadducts as single isomers which are assigned as the cycloadducts to the syn form of the ylides.
STEREOSELECTIVE HYDROALKYLIDENATION OF OLEFIN WITH PYRIDINIUM METHYLIDES
Tsuge, Otohiko,Kanemasa, Shuji,Takenaka, Shigeori,Kuraoka, Satoru
, p. 465 - 468 (2007/10/02)
Acid-catalyzed elimination of pyridine from the stereoselective cycloadducts between electron-deficient olefins and pyridinium methylides with ylide-stabilizing substituents offers a new type of C-C bond formation.
STEREOSELECTIVE CYCLOADDITION REACTION OF PYRIDINIUM AND THIAZOLIUM METHYLIDES TO ELECTRON-DEFICIENT OLEFINIC DIPOLAROPHILES
Tsuge, Otohiko,Kanemasa, Shuji,Takenaka, Shigeori
, p. 1907 - 1912 (2007/10/02)
The cycloaddition reaction of pyridinium and thiazolium methylides to electron-deficient olefinic dipolarophiles has been found to take place through an endo approach of the anti-ylides to the dipolarophiles affording the stereoselective cycloaddu
