Reverse Aromatic Cope Rearrangement of 2-Allyl-3-alkylideneindolines Driven by Olefination of 2-Allylindolin-3-ones: Synthesis of α-Allyl-3-indole Acetate Derivatives
作者:Tomomi Kawasaki、Yoshinori Nonaka、Kazuaki Watanabe、Atsuyo Ogawa、Kazuhiro Higuchi、Romi Terashima、Kouhei Masuda、Masanori Sakamoto
DOI:10.1021/jo0014921
日期:2001.2.1
The reverse aromatic Cope rearrangement of 2-allyl-3-alkylideneindolines obtained by Horner-Wadsworth-Emmons olefination of 2-allylindolin-3-ones was performed. When 2-allylindolin-3-ones were treated with phosphonium ylides in refluxing toluene, domino Wittig reaction and reverse aromatic Cope rearrangement took place to give alpha-allyl-3-indole acetate derivatives in good yields. The aromatization
进行了通过2-allylindolin-3-one的Horner-Wadsworth-Emmons烯化反应获得的2-allyl-3-亚烷基二氢吲哚的反向芳香族Cope重排。当在回流的甲苯中用磷鎓的叶立德对2-烯丙基--3-烯丙基进行处理时,发生多米诺骨牌Wittig反应和反向芳族Cope重排,从而以高收率得到了α-烯丙基-3-吲哚乙酸酯衍生物。作为Cope重排中的新驱动力的芳构化优选于与作为众所周知的驱动力的羰基和氰基的缀合以及烷基取代模式。