Controlled Synthesis of α-Allenic Ester and Spiro Ketone Derivatives from Tailored α-Substituted Cycloalkanones Through Cascade Reactions: Exploring the Possible Reaction Pathways by Means of Semiempirical MO Calculations
作者:Antonio J. Mota、Aurélie Klein、Florence Wendling、Alain Dedieu、Michel Miesch
DOI:10.1002/ejoc.200500339
日期:2005.10
(or) spiro ketones have been obtained through a cascade reaction when acetylenic ω-keto esters were treated with tetra-n-butylammonium fluoride (TBAF). The isolated products can be modulated by using different starting materials (i.e. varying ring size, spacer length) and reaction times. The results indicate that these reactions take place under kinetic control. In line with this, a semiempirical study
当炔烃ω-酮酯用四正丁基氟化铵(TBAF)处理时,通过级联反应获得了功能化的双环亲电丙二烯和(或)螺酮。可以通过使用不同的起始材料(即不同的环大小、间隔长度)和反应时间来调节分离的产物。结果表明这些反应在动力学控制下发生。与此一致,进行了半经验研究以确定优选的反应途径和优选的双环丙二烯衍生物的顺式/反式构象。在理论和实验结果之间发现了极好的相关性,整个过程极大地取决于 HF 分子的存在。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)