Consecutive Aminolithiation–Carbolithiation of a Linear Aminoalkene Bearing Terminal Vinyl Sulfide Moiety to Give Hydroindolizine
作者:Yasutomo Yamamoto、Tatsuya Yamaguchi、Atsunori Kaneshige、Aiko Hashimoto、Sachiho Kaibe、Akari Miyawaki、Ken-ichi Yamada、Kiyoshi Tomioka
DOI:10.1055/s-0036-1588522
日期:2017.12
proceeded smoothly using stoichiometric amounts of BuLi. Both aminolithiation and carbolithiation were in equilibrium at room temperature, and the stereochemistry of the cyclization was thermodynamically controlled. At –78 °C the reaction was kinetically controlled and the cyclized product, 1,2-disubstituted octahydroindolizine, was obtained with good diastereoselectivity.
使用化学计量量的 BuLi,带有乙烯基硫化物部分的氨基烯烃的氨基锂化 - 碳锂化串联环化可以顺利进行。氨基锂化和碳锂化在室温下均处于平衡状态,环化的立体化学受热力学控制。在–78 °C 时,反应受到动力学控制,并以良好的非对映选择性获得环化产物 1,2-二取代八氢茚茚。