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《Comptes Rendus Chimie》2014,17(12):1165-1168
In the course of the Lewis acid-mediated cycloaddition of 1,8-bis(trimethylsilyl)-2,6-octadiene to bis-ketals, we have observed an unprecedented retro-Claisen condensation from the ketalisation of a 3-hydroxy-2,4-pentadione giving rise to a substituted 2,2,3-trimethoxybutane and an anti-Markovnikov stereoselective cycloaddition of the 1,8-bis(trimethylsilyl)-2,6-octadiene to this latter ketal. 相似文献
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Highly functionalized catechol ketals exhibiting either a tert-butyl moiety or a spiro center in position 2 are synthesized by ketalization and functionalized in a sequence of subsequent transformations. By a specific ketalization protocol catechol ketals of enolizable β-keto esters can be prepared. With the succeeding steps these compounds incorporate moieties, which are not compatible and accessible by direct ketalization of catechol. 相似文献
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Jing Zhuang 《Tetrahedron》2009,65(47):9797-1679
A novel one-pot synthesis of aryl α-keto esters was developed through oxidation of aryl-ketones using selenium dioxide, esterification accompanied by ketalization, and hydrolysis. Both aromatics and heteroaromatics gave good yields by this one-pot method. 相似文献
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An efficient ketalization of aldehydes, ketones, and α,β-unsaturated aldehydes using thiazolium salt 1 as a neutral catalyst is described. 相似文献
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