Room-Temperature Electrophilic 5-<i>endo</i>-<i>dig</i>Chlorocyclization of Alk-3-yn-1-ones with the Use of Pool Sanitizer: Synthesis of 3-Chlorofurans and 5-Chlorofuropyrimidine Nucleosides
作者:Adam Sniady、Marco S. Morreale、Kraig A. Wheeler、Roman Dembinski
DOI:10.1002/ejoc.200800397
日期:2008.7
chlorocyclization of 1,4-disubstituted alk-3-yn-1-ones (propargylic ketones) with the use of trichloro-s-triazinetrione (trichloroisocyanuric acid, TCCA; 0.4 equiv.) in toluene, at room temperature, in the absence of base, provides 2,5-disubstituted 3-chlorofurans in high yields (79–96 %). The reaction can be accomplished by using commercially available swimming pool sanitizer. Selected 3-chlorofuran was validated
在室温下,使用三氯-s-三嗪三酮(三氯异氰尿酸,TCCA;0.4 当量)对 1,4-二取代的 alk-3-yn-1-ones(炔丙基酮)进行 5-endo-dig 氯环化反应在没有碱的情况下,温度以高产率 (79–96%) 提供 2,5-二取代的 3-氯呋喃。该反应可以通过使用市售的游泳池消毒剂来完成。选定的 3-氯呋喃被验证为 Suzuki-Miyaura 偶联的底物。以类似的方式,5-炔基-2'-脱氧尿苷的氯环化产生 5-氯呋喃嘧啶核苷(76-83%),它是强效抗病毒药物的类似物。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)