Lithium Aldol Reactions of α-Chloroaldehydes Provide Versatile Building Blocks for Natural Product Synthesis
作者:Robert Britton、Shira Halperin、Baldip Kang
DOI:10.1055/s-0030-1260032
日期:2011.6
The lithium aldol reaction of α-chloroaldehydes provides 1,2-anti-configured β-ketochlorohydrins. The scope of this reaction is demonstrated as well as its application to the synthesis of the C4-C15 segment of haterumalide NA.
Highly diastereoselective synthesis of substituted epichlorohydrins and regioselective preparation of allyl alcohols using chloro or iodomethyllithium
作者:JoséM. Concellón、Luján Llavona、Pablo L. Bernad
DOI:10.1016/0040-4020(95)90943-q
日期:1995.5
Substituted epichlorohydrins 3 or 6 are obtained from α-bromo or α-chlorocarbonyl compounds (1 or 4) and chloro or iodomethyllithium, respectively. Starting from α-bromocarbonyl compounds 1 or acyclic α-chloro ketones the reaction takes place with total diastereoselectivity. Treatment of epichlorohydrins 3 or 6 with lithium iodide affords the same substituted allyl alcohols 7 in a regioselective manner
Highly enantioselective [4 + 2] cyclization of chloroaldehydes and 1-azadienes catalyzed by N-heterocyclic carbenes
作者:Teng-Yue Jian、Li-Hui Sun、Song Ye
DOI:10.1039/c2cc35273g
日期:——
Highly functionalized dihydropyridinones were synthesized via the N-heterocyclic carbene-catalyzed enantioselective [4 + 2] annulation of alpha-chloroaldehydes and azadienes. Hydrogenation of the resulted dihydropyridinones afforded the corresponding piperidinones with high enantiopurity.
(<i>S</i>)-2-Pentyl (<i>R</i>)-3-Hydroxyhexanoate, a Banana Volatile and Its Olfactory Recognition by the Common Fruit Fly, <i>Drosophila melanogaster</i>
The volatile organic compounds emitted from ripening bananas that elicit an antennal response from the common fruit fly, Drosophila melanogaster, were analyzed by a combination of gas chromatographic−electroantennographic detection, mass spectrometry, and 1H NMR spectroscopy. These analyses revealed that the headspace of ripening bananas contains a number of EAD-active components including the new
结合了气相色谱-电电图,质谱和1 H NMR光谱分析了成熟香蕉发出的挥发性有机化合物,这些香蕉引起了普通果蝇果蝇的触角反应。这些分析表明,成熟香蕉的顶部空间包含许多EAD活性成分,包括新的酯(S)-2-戊基(R)-3-羟基己酸酯,其结构分配已通过化学合成得到证实。