Sequential substitution/ring cleavage/addition reaction of 1-(cyclohex-1-enyl)-piperidine and -pyrrolidine with chloropyruvates for the efficient synthesis of substituted 4,5,6,7-tetrahydro-1H-indole derivatives
作者:Vakhid A. Mamedov、Elena A. Hafizova、Anastasiya I. Zamaletdinova、Il'dar Kh. Rizvanov、Alla B. Mirgorodskaya、Lucia Ya. Zakharova、Shamil K. Latypov、Oleg G. Sinyashin
DOI:10.1016/j.tet.2015.10.004
日期:2015.12
Sequential substitution/ring cleavage/addition reaction of 1-(cyclohex-1-enyl)-piperidine and -pyrrolidine with chloropyruvates has been accomplished for the synthesis of various polysubstituted 4,5,6,7-tetrahydroindoles. This one-pot, general and highly regioselective method avoids harsh conditions and expensive catalysts. It proceeds with high atom-efficiency and shows a broad substrate scope and
1-(环己-1-烯基)-哌啶和-吡咯烷与氯丙酮酸酯的顺序取代/环裂解/加成反应已经完成,用于合成各种多取代的4,5,6,7-四氢吲哚。这种一锅,一般和高度选择性方法避免了苛刻的条件和昂贵的催化剂。它以高原子效率进行,并显示出广泛的底物范围和官能团耐受性,使其成为制备各种四氢吲哚衍生物的高度实用的方法。以高收率合成了17个四氢吲哚家族,这表明该反应的一般特征。具有各种取代基的四氢吲哚衍生物中的10个成功地转化成相应的吲哚。该方法允许接近在氮原子上(通过烯胺的变化)和在C2,C3位上(通过丙酮酸酯的变化,包括溴代芳基和氯烷基衍生物)带有ω-卤代-(主要是氯-)丁基和戊基取代基的吲哚。该反应可与烯胺合成结合使用,从而提供一种实用的三组分杂环化方法,以从环己酮,吡咯烷和芳基氯丙酮酸酯生产4,5,6,7-四氢吲哚。