Synthesis and reactivity of N-sugar-maleimides: an access to novel highly substituted enantiopure pyrazolines

New fluoro triazol porphyrin-cellulose: synthesis, characterization and antibacterial activity

“…Synthesis of the azide surface‐modified cellulose Cotton‐N 3 (4), was conducted according to literature procedures with some modifications . A total of 400‐mg Cotton‐Tos was suspended in 20 ml of DMF ( N , N ‐dimethylformamide), followed by careful addition of 400 mg of sodium azide.…”

Synthesis of Novel Pyrazole–sucrose Derivatives by 1,3‐dipolar Cycloaddition

“…Yield (50%), yellow oil., Rf = 0.22 (cyclohexane/AcOEt 3:7). 1 ((((3aR,5R,5aS,8aS,8bR)-2,2,7,7tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4 0 ,5 0 -d…”

“…Yield (50%), yellow oil., Rf = 0.19 (cyclohexane/AcOEt 3:7). 1 H NMR (300 MHz,CDCl 3 ) δ7.67-6.90 (AA 0 BB 0 , J AA 0 BB 0 = 9 Hz, 4H, H arom ), 6 3-(4-Chlorophenyl)-5-((((3aR,5R,5aS,8aS,8bR)-2,2,7,7tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4 0 ,5 0 -d] pyran-5-yl)…”

“…The 1,3‐dipolar cycloaddition reaction has found extensive application in the preparation of carbohydrate derivatives. This method, developed by Huisgen, has become an important tool in organic synthesis . Pyrazoles have found wide application in organic synthesis as well as in medicine, agriculture, and industry .…”

Asymmetric Cycloaddition: An Efficient Synthesis of Enantiopure Isoxazolines Substituted with Carbohydrate Analogues

“…It was observed that maleimidosugar can react in the [3 + 2] cycloaddition with aromatic nitrile, affording isoxazolines. The cycloaddition of N ‐sugar‐maleimide in the presence of MgBr 2 afforded isoxazolines with high diasterioselectivities .…”