Hydroalumination of selenoacetylenes: a versatile generation and reactions of α-aluminate vinyl selenide intermediates in the highly regio and stereoselective synthesis of telluro(seleno)ketene acetals
作者:Palimécio G. Guerrero、Miguel J. Dabdoub、Adriano C.M. Baroni
DOI:10.1016/j.tetlet.2008.04.072
日期:2008.6
(Z)-butylseleno vinyl alanates intermediates which were captured with C4H9TeBr furnishing the (E)-telluro(seleno)ketene acetals exclusively. The isomers with opposite stereochemistry (Z)-telluro(seleno)ketene acetals were obtained by the reduction of phenylseleno acetylenes with lithium di-(isobutyl)-n-butyl aluminate hydride (Zweifel’s reagent) followed by reaction of (E)-phenylseleno vinyl alanates intermediates
丁基硒炔乙炔与DIBAL-H的氢铝化反应,然后添加原位生成的(Z)-丁基硒代乙烯基丙二酸酯中间体,用C 4 H 9 TeBr捕获的正丁基锂,专门提供(E)-碲基(硒代)乙烯酮缩醛。通过用二(异丁基)-正丁基铝酸氢化铝锂(Zweifel试剂)还原苯基硒基乙炔,然后使(E)-苯基硒基乙烯基化合物反应,可获得具有相反立体化学(Z)-碲(硒基)乙烯酮缩醛的异构体用C 4 H 9 TeBr丙酸酯中间体。