咪唑和1,2,4-三嗪之间的分子内逆电子需求的Diels-Alder反应由三亚甲基系链从咪唑N1位置连接到三嗪C3,从而以极好的收率进行生产1,2,3,4-四氢-1,5-萘啶。该反应通过环加成反应进行,随后损失氮气,然后逐步损失腈。使用四亚甲基系链的类似分子内环加成反应也以可接受的收率得到了2,3,4,5-四氢-1 H-吡啶并[3,2- b ]氮杂。微波辐射也可以促进产生四氢-1,5-萘啶的反应。
1,2,3,4-Tetrahydro-1,5-naphthyridines and related heterocyclic scaffolds: exploration of suitable chemistry for library development
作者:Grace H.C. Woo、Aaron B. Beeler、John K. Snyder
DOI:10.1016/j.tet.2007.04.003
日期:2007.6
The chemistry of 1,2,3,4-tetrahydro-1,5-naphthyridines and 2,3,4,5-tetrahydro-1H-pyrido[3,2-b] azepines has been explored with the goal of discovering reactions at N1 suitable for library development. Epoxide openings, Pd-catalyzed N-arylations, DEPBT-promoted acylations, and urea formation through the reaction with isocyanates were all successful. The epoxide opening chemistry using homochiral epichlorohydrin followed by epoxide reclosure and a second nucleophilic opening led to the preparation of a small 24-membered library. (C) 2007 Elsevier Ltd. All rights reserved.