نتایج جستجو برای: intramolecular reaction
تعداد نتایج: 423005 فیلتر نتایج به سال:
A Barbier reaction-Heck arylation sequence from α-bromomethylbutenolide to fused tri and tetracyclic lactones has been developed. The first step involving a Barbier reaction enabled installing ortho-bromoaromatics in α-ylidene γ-lactones. The latter substrates were subjected to intramolecular Heck reaction conditions which selectively afforded 6,5,5 or 6,6,5 fused ring systems depending on the ...
Abstract. We report herein the synthesis of [7,5]-fused bicyclic acetals, also named furooxepines through a gold(I)-catalyzed domino reaction. During this transformation, two molecules homopropargyl alcohol react together, in sequence including an intramolecular hydroalkoxylation, condensation, 1,6-enyne cycloisomerization, acetalization and isomerization. This reaction allow formation three bo...
reactions of n-isocyaniminotriphenylphosphorane with cyclopentanone have been studied in the presence of aromatic carboxylic acids and primary amines, proceeds smoothly at room temperature under neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives by an intramolecular aza-wittig cyclization in ch2cl2 in excellent yields. the structures of the products were deduced from...
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