Iodine-Promoted N–H/α,β-C(sp<sup>3</sup>)-Trifunctionalization of <scp>l</scp>-Proline: Access to 3,4-Dihydrobenzo[<i>b</i>][1,7]naphthyridines via Consecutive Decarboxylation/Ring Opening/Dicyclization
作者:Xiao Geng、Can Wang、Peng Zhao、You Zhou、Yan-Dong Wu、An-Xin Wu
DOI:10.1021/acs.orglett.9b01277
日期:2019.7.5
proceeding through an iodine-promoted consecutive decarboxylation/ring-opening/dicyclization process, is achieved. This strategy affords structurally diverse fused N-heterocycles in good yields with a wide substrate scope. Preliminary mechanistic studies indicate that catabolism of l-proline might be involved in this cascade reaction and the in situ generated intermediate 4-aminobutanal was identified
AN-H /α,β-C(SP 3)的-trifunctionalization升-脯氨酸,通过碘促进的连续脱羧/开环/ dicyclization过程继续进行,得以实现。该策略以良好的产率提供了结构多样的稠合N-杂环,具有广泛的底物范围。初步机理研究表明的该分解代谢升-脯氨酸可能参与该级联反应和原位生成的中间4-氨基丁醛被确定为关键中间体。值得注意的是,这种多米诺骨牌策略丰富了多用途1-脯氨酸在稠合杂环的合成中的反应性。