Synthesis of functionalised furans and pyrroles through annulation reactions of 4-pentynones
作者:Antonio Arcadi、Elisabetta Rossi
DOI:10.1016/s0040-4020(98)00953-3
日期:1998.12
A new approach to 4-pentynones through palladium-catalysed coupling reaction of the ready available 2-propynyl ketones with aryl iodides and/or vinyl triflates is proposed. Annulation reactions of both 2-propynyl ketones and 4-pentynones gave functionalised furans using potassium tert-butoxide in DMF and functionalised pyrroles in the presence of benzylamine or ammonia, respectively in good to high
提出了一种新的4-戊炔酮通过钯催化的2-丙炔基酮与芳基碘化物和/或乙烯基三氟甲磺酸酯的偶联反应的新方法。使用叔丁醇钾在DMF中的官能化呋喃和苄基胺或氨存在下的官能化吡咯分别进行2-丙炔基酮和4-戊炔酮的环化反应,收率良好或高收率。该方法已被扩展的17制备β -hydroxyandrost -4-烯并[3,2- b ] - (5-甲基)呋喃和17 β -hydroxyandrost -4-烯并[3,2- b](1-苄基-5-甲基)吡咯。当将4-戊炔酮用甲醇钠的甲醇溶液处理时,观察到不同的反应模式。还显示了在一种2-pentyn-1,6-dione的情况下反应介质对环化反应结果的影响(异环化vs.碳环化)。