The Aza-Prins Reaction of 1,2-Dicarbonyl Compounds with 3-Vinyltetrahydroquinolines: Application to the Synthesis of Polycyclic Spirooxindole Derivatives
作者:Shinichi Saito、Tomohiro Katamura、Rei Tsukazaki、Akito Fujisawa、Yusuke Yoshigoe、Yuichiro Mutoh
DOI:10.1021/acs.joc.1c01785
日期:2021.12.3
aza-Prins reaction of 6,7-dimethoxy-3-vinyl-1,2,3,4-tetrahydroquinoline (1) with 1,2-dicarbonyl compounds proceeded smoothly in the presence of HCl, and the corresponding tricyclic benzazocines were isolated in yields of 20–86%. The reaction proceeded in a stereoselective manner, and the formation of the 2,4-trans isomer was observed. The reaction of 1 with an enantiopure ketoester gave the corresponding tricyclic
6,7-二甲氧基-3-乙烯基-1,2,3,4-四氢喹啉( 1 )与1,2-二羰基化合物的aza-Prins反应在HCl存在下顺利进行,并分离出相应的三环苯并佐辛收益率为 20-86%。反应以立体选择性方式进行,观察到2,4-反式异构体的形成。 1与对映体纯酮酯的反应得到相应的三环苯并佐辛,为非对映异构体的混合物。非对映异构体很容易分离并转化为对映体纯三环苯并佐辛。通过1与靛红衍生物的反应合成了螺吲哚衍生物。