Hetero-Diels–Alder reaction of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with arylsulfonylcyanides. Synthesis and antimicrobial activity of 4-hydroxy-2-(arylsulfonyl)pyridines
摘要:
Hetero-Diels-Alder reactions of 1,3-bis(silyloxy)-1,3-butadienes with arylsulfonylcyanides afforded a variety of 4-hydroxy-2-(arylsulfonyl) pyridines. Several derivatives show antimicrobial activity against Gram-positive bacteria. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of 4-hydroxy- and 2,4-dihydroxy-homophthalates by [4+2] cycloaddition of 1,3-bis(silyloxy)-1,3-butadienes with dimethyl allene-1,3-dicarboxylate
作者:Ibrar Hussain、Mirza A. Yawer、Bettina Appel、Muhammad Sher、Ahmed Mahal、Alexander Villinger、Christine Fischer、Peter Langer
DOI:10.1016/j.tet.2008.05.118
日期:2008.8
The reaction of 1,3-bis(trimethylsiloxy)-1,3-butadienes with dimethyl allene-1,3-dicarboxylate provides a convenient and regioselective approach to a variety of functionalized 4-hydroxy- and 2,4-dihydroxy-homophthalates.
Substituted 3,5-dioxopimelic acid diesters, stable 1,3,5,7-tetracarbonyl derivatives, were prepared by condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with methyl malonyl chloride. The influence of the substituents and the solvent on the keto–enoltautomerization of these compounds was investigated by NMR spectroscopy. For the parent compound, the experimental findings were compared with
The (4+2) cycloaddition of 1-ethoxy-2-fluoro-1,3- bis(trimethylsilyloxy)-1,3-diene with dimethyl acetylenedicarbox- ylate (DMAD) afforded dimethyl 4-fluoro-3,5-dihydroxyphthalate. Site-selectiveSuzuki-Miyaurareactions of its bis(triflate) provide a convenient approach to 3,5-diaryl-4-fluorophthalates.
Synthesis of Highly Functionalized Biaryls by Condensation of 2-Fluoro-1,3-bis(silyloxy) 1,3-Dienes with 3-Cyanochromones and Subsequent Domino “Retro-Michael/Aldol/Fragmentation”
The Me3SiOTf-mediated condensation of 1-ethoxy-2-fluoro-1,3-bis(trimethylsilyloxy) 1,3-dienes with 3-cyanochromones afforded 3-cyano-2-(4-ethoxy-3-fluoro-2,4-dioxobutyl)-chroman-4-ones. Their reaction with triethylamine afforded fluorinated azaxanthones or biaryls. The product distribution depends on the structure of the diene. The formation of the biaryls can be explained by an unprecedented domino "retro-Michael/aldol/fragmentation" reaction.