首页> 外文期刊>Chemistry: A European journal >Synthesis of Functionalized 2-Alkylidenetetrahydrofurans by Cyclization of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with Epoxides
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Synthesis of Functionalized 2-Alkylidenetetrahydrofurans by Cyclization of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with Epoxides

机译:1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯与环氧环化合成功能化的2-亚烷基四氢呋喃

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摘要

The Lewis acid mediated cyclization of epoxides with 1,3-bis(trimethylsilyloxy)-1,3-butadienes, electroneutral equivalents of 1,3-dicarbonyl dianions, results in the formatin of 2-alkylidenetrahydrofurans with a great variety of sustitution patterns and functional groups. This includes the synthesis of 2,3-'-bifuranylidenes and 7-oxabicyclo[4.3.0]nonanes. The cycliation of dienes with functinalized epoxides containing base-babile groups procees with good chemoselectivity. In all reactions, good regio-and and E diastereoseletivities are observed. Based on the stereoselectivities observed for reactions of 1,2-disubstituted epoxides, a working hypothesis for the mechanism of the reaction is suggested.
机译:Lewis酸介导的1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯,1,3-二羰基二价电子中性当量的环氧化物的环化反应导致2-亚烷基二氢呋喃的甲壳素具有多种取代模式和功能组。这包括2,3 -'-双呋喃基亚烷基和7-氧杂双环[4.3.0]壬烷的合成。用具有碱-基团的官能化环氧化物环化二烯,具有良好的化学选择性。在所有反应中,均观察到良好的区域和E非对映选择性。基于观察到的1,2-二取代环氧化物反应的立体选择性,提出了反应机理的可行假设。

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