Polymerizations by 1,3-Dipolar Cycloaddition Reactions. VI. Syntheses of Polyurethans with Isoxazoline or Isoxazole Linkages
نویسندگان
چکیده
منابع مشابه
Rhodium(II)-Catalyzed 1,3-Dipolar Cycloaddition Reactions
The rhodium(II)-catalyzed formation of 1,3-dipoles has played a major role in facilitating the use of the dipolar cycloaddition reaction in modern organic synthesis. This is apparent from the increasing number of applications of this chemistry for the construction of heterocyclic and natural product ring systems. This chapter initially focuses on those aspects of rhodium(II) catalysis that cont...
متن کاملSynthesis and 1,3-Dipolar Cycloaddition Reactions of Chiral Maleimides
New routes to the synthesis of various novel chiral maleimides are described. The oxabicyclic anhydride 2 readily available exo-Diels-Alder adduct of furan and maleic anhydride was used as a vehicle, which in turn reacted with hydrochlorides of amino acids 3a-f in the presence of Et3N with release of furan to give the requisite novel chiral imides 4a-f in good to moderate yields. The stereosele...
متن کامل1,3-dipolar cycloaddition reactions of N-methyl-substituted tricyclic imides.
The [3+2] cycloadditions of N-methyl derivatives of unsaturated imides with various nitrile oxides to yield new bridged isoxazoline derivatives with potential biological activity is described.
متن کاملSynthesis and Biological Evaluation of Novel Hybrid Molecules Containing Purine, Coumarin and Isoxazoline or Isoxazole Moieties
Introduction The 1,3-dipolar cycloaddition reactions of nitrile oxides formed in situ (in the presence of NCS and Et3N) from the oximes of (purin-9-yl)acetaldehyde or (coumarinyloxy)acetaldehyde with allyloxycoumarins or 9-allylpurines, respectively resulted in 3,5-disubstituted isoxazolines. The similar reactions of propargyloxycoumarins or 9-propargylpurines led to 3,5-disubstituted isoxazole...
متن کامل1,3-Dipolar Cycloaddition Reaction of Nitrile Oxides to Isatin Imines
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1968
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.41.1654