作者:Stefan Michlik、Rhett Kempe
DOI:10.1038/nchem.1547
日期:2013.2
The pyrrole heterocycle is a prominent chemical motif and is found widely in natural products, drugs, catalysts and advanced materials. Here we introduce a sustainable iridium-catalysed pyrrole synthesis in which secondary alcohols and amino alcohols are deoxygenated and linked selectively via the formation of CâN and CâC bonds. Two equivalents of hydrogen gas are eliminated in the course of the reaction, and alcohols based entirely on renewable resources can be used as starting materials. The catalytic synthesis protocol tolerates a large variety of functional groups, which includes olefins, chlorides, bromides, organometallic moieties, amines and hydroxyl groups. We have developed a catalyst that operates efficiently under mild conditions. Pyrroles are a highly important class of compounds with a wide variety of applications in biochemistry, pharmacy and materials science. Here, an iridium-catalysed synthesis of pyrroles is described, starting from renewable resources, alcohols that may be derived from lignocellulosic feedstocks and amino alcohols. The reaction proceeds by a condensation reaction that liberates two equivalents of hydrogen gas.
吡咯杂环是一种突出的化学基元,广泛存在于天然产物、药物、催化剂和先进材料中。本文介绍了一种可持续的铱催化吡咯合成方法,该方法通过形成C–N和C–C键,选择性地对二级醇和氨基醇进行脱氧耦合。反应过程中消除了两当量的氢气,并且可以完全使用可再生资源衍生的醇作为起始原料。催化合成方案能够耐受多种官能团,包括烯烃、氯化物、溴化物、有机金属基团、胺和羟基等。我们开发了一种在温和条件下高效运作的催化剂。吡咯是一类具有广泛应用的重要化合物,涉及生物化学、药物学和材料科学等领域。本文描述了一种从可再生资源出发,铱催化的吡咯合成方法,起始原料为来自木质纤维素原料的醇和氨基醇。该反应通过缩合反应释放两当量的氢气。