Synthesis of a Novel Type of 2,3′-BIMs via Platinum-Catalysed Reaction of Indolylallenes with Indoles
作者:Lisa Cooper、José Miguel Alonso、Louise Eagling、Helen Newson、Sachini Herath、Christopher Thomson、Andrew Lister、Catherine Howsham、Brian Cox、María Paz Muñoz
DOI:10.1002/chem.201705417
日期:2018.4.20
Optimisation, scope and mechanism of the platinum-catalysed addition of indoles to indolylallenes is reported here to give 2,3'-BIMs with a novel core structure very relevant for pharmaceutical industry. The reaction is modulated by the electronic properties of the substituents on both indoles, with the 2,3'-BIMs favoured when electron donating groups are present. Although simple at first, a complex
本文报道了铂催化吲哚与吲哚联烯加成的优化、范围和机制,以产生具有与制药工业非常相关的新型核心结构的 2,3'-BIM。该反应受到两个吲哚上取代基的电子性质的调节,当存在给电子基团时,2,3'-BIMs 受到青睐。虽然一开始很简单,但已经发现了一个复杂的机制,可以解释这些系统与铂和其他金属(例如金)相比的不同行为。详细的标记研究表明,Pt 催化的吲哚基联烯的 6-endo-trig 环化是反应的第一步,并且两个环状乙烯基-铂中间体通过铂卡宾达到平衡,作为催化循环的关键中间体第二次亲核攻击和 BIM 的形成。