Structural characterization of strained oxacycles by 13C NMR spectroscopy
作者:Martín J. Riveira、Agustina La-Venia、Mirta P. Mischne
DOI:10.3998/ark.5550190.0012.714
日期:——
The H and C NMR data of a series of epoxyand epidioxy-bridged tetrahydropyran derivatives containing the same basic carbon skeleton, are reported. C NMRspectroscopy was shown to be useful for structural determination of both substructures allowing facile distinction of otherwise similar compounds.
报道了一系列含有相同基本碳骨架的环氧基和表二氧基桥连四氢吡喃衍生物的 H 和 C NMR 数据。C NMR 光谱被证明可用于确定两种亚结构的结构,从而可以轻松区分其他相似的化合物。
New Strategy for the Construction of Epoxy-Bridged Tetrahydropyran Frameworks from Trioxane Precursors: Application to a Concise Synthesis of a Riesling Acetal
作者:Martín J. Riveira、Agustina La-Venia、Mirta P. Mischne
DOI:10.1021/jo8017928
日期:2008.11.7
A simple one-pot method to prepare dioxabicyclo[2.2.1] heptane derivatives, from readily available 1,2,4-trioxane frameworks, under catalytic hydrogenation conditions over a platinum surface is reported. The overall transformation involves the hydrogenation of the double bond and a ring contraction rearrangement that presumably proceeds via a hydrogenolytic cleavage of the O-O bond and subsequent intramolecular ketalization. The strategy was successfully applied to the synthesis of a Riesling acetal.
Structure and synthesis of two novel ionone-type compounds identified in quince brandy (Cydonia oblonga Mil.)
Twonew ionone-type compounds (1 and 2) were isolated fromquince brandy (Cydoniaoblonga Mil.) and their structures deduced from spectroscopic data and confirmed by synthesis. 13C-, 1H-NMR and MS data as well as olfactive properties of 1 and 2 are given.