Rapid and Easy Access to (E)-1,3-Enynes, 1,3-Diynes and Allenes Starting from Propargylic Acetals, Exploiting the Different Reactivity of Lithium and Mixed Lithium–Potassium Organometallic Reagents
作者:Marco Blangetti、Annamaria Deagostino、Helèna Rosso、Cristina Prandi、Chiara Zavattaro、Paolo Venturello
DOI:10.1002/ejoc.200700520
日期:2007.12
The treatment of propargylic acetals with various lithium and mixed lithium–potassium Schlosser reagents, has allowed a one-pot synthesis of (E)-1,3-enynes, 1,3-diynes and allenes, depending on the reaction conditions and the selected base. Various reaction conditions were investigated in order to control the selectivity of the reactions and to obtain pure products. The metallation–elimination sequence
用各种锂和混合锂钾 Schlosser 试剂处理炔丙缩醛,根据反应条件和选择的不同,可以一锅合成 (E)-1,3-烯炔、1,3-二炔和丙二烯。根据。为了控制反应的选择性并获得纯产物,研究了各种反应条件。在合适的亲电子试剂存在下,金属化-消除序列为官能化 (E)-共轭烯炔、二炔和丙二烯提供了线性途径。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)