Regio- and Stereoselective Double Addition of Anionic C-Nucleophiles to Cobalt-Stabilized Acetylenedicarbaldehyde
作者:Christine Sui-Seng、Michèle Soleilhavoup、Luc Maurette、Christine Tedeschi、Bruno Donnadieu、Remi Chauvin
DOI:10.1002/ejoc.200200593
日期:2003.5
Gorgues’ acetylenedicarbaldehyde is an appealing, highly functional C4 synthon, which can be stabilized by η2 complexation to a Co2(CO)6 unit. In contrast to the homologous dibenzoylacetylene complex, it can be used as a normal, doubly electrophilic, non-conjugated γ-dicarbonyl substrate toward alkyl-, aryl-, and alkynyllithium compounds or magnesium bromides; these anionic C-nucleophiles do not predominantly
尽管本质上不稳定,Gorgues 的乙炔二甲醛是一种吸引人的、功能强大的 C4 合成子,它可以通过与 Co2(CO)6 单元的 η2 络合来稳定。与同源二苯甲酰基乙炔络合物相比,它可以用作正常的双亲电非共轭 γ-二羰基底物,用于生成烷基-、芳基-和炔基锂化合物或溴化镁;这些阴离子 C-亲核试剂并不主要攻击金属羰基中心。1,4-二烷基-和1,4-二苯基丁-2-炔-1,4-二醇产物具有显着的meso/dl非对映选择性(4-66% de),这可以通过基于以下的简单模型来解释X 射线衍射数据和 MM 计算。烷基溴化镁和芳基溴化镁反应物比它们的锂对应物更具选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA,