A new approach to monoprotected 1,4-benzodiazepines via a one-pot N-deprotection/reductive cyclization procedure
作者:Tobias Alexander Popp、Edgar Uhl、Duc Nghia Ong、Sebastian Dittrich、Franz Bracher
DOI:10.1016/j.tet.2016.02.019
日期:2016.3
deprotection and an intramolecular reductive N-alkylation. A consecutive methylation at N-1 can be accomplished by adding 1,3,5-trioxane to the reaction mixture. The resulting N4-monoprotected 1,4-benzodiazepines are versatile building blocks for the synthesis of variously substituted drug candidates.
本文介绍了一种从N -Boc保护的2-氨基苄醇和N-糖基保护的2-氨基乙醛二甲基乙缩醛开始的2,3,4,5-四氢-1 H -1,4-苯并二氮杂卓的新方法。在Mitsunobu条件下连接两个构件之后,用三乙基硅烷和三氟乙酸完成一锅环化。该转化涉及Boc脱保护和分子内还原性N-烷基化。通过在反应混合物中加入1,3,5-三恶烷可以实现N-1处的连续甲基化。所得的N4-单保护的1,4-苯并二氮杂pine是用于合成各种取代的候选药物的通用结构单元。