使用光环化作为关键步骤,已经建立了两种合成高法丝素B,C和类似物的途径。第一条路线是基于在Cu(OAc)2中的2-氯-3-酰基-1- [2-(吲哚-3-基)乙基]吲哚和空气饱和丙酮的顺序光环化和光化学脱氢反应。第二步是基于两步反应的,即2-氯-3-酰基-1-[[2-(吲哚-3-基)乙基]吲哚在丙酮中的光环化和DDQ介导的13-酰基脱氢室温下苯中的-6,7-二氢吡啶并[1,2- a ; 3,4- b ']二吲哚。相比之下,用于合成高法丝溶素B,C和类似物的两步法比一锅法更有效。
One-step transformation of the marine alkaloid fascaplysin into homofascaplysins B and B-1. The first syntheses of 3-bromohomofascaplysin B and 3–bromohomofascaplysin B-1
作者:Maxim E. Zhidkov、Maria A. Sidorova、Irina A. Lyakhova
DOI:10.1016/j.tetlet.2018.02.070
日期:2018.4
A method for one-step conversion of the marine alkaloid fascaplysin into homofascaplysins B and B-1 was elaborated. It was also used for the first syntheses of the marine alkaloids 3-bromohomofascaplysin B and 3-bromohomofascaplysin B-1. The best results were demonstrated under the action of microwave irradiation in presents of dihydroquinone as a reducing agent. (C) 2018 Elsevier Ltd. All rights reserved.