A New Synthesis of Benzo[f]isoindole-4,9-diones by Radical Alkylation and Bromomethylation of 1,4-Naphthoquinones
作者:Jurgen Deblander、Sam Van Aeken、Jan Jacobs、Norbert De Kimpe、Kourosch Abbaspour Tehrani
DOI:10.1002/ejoc.200900562
日期:2009.10
of 1-alkylbenzo[f]isoindole-4,9-diones by bromomethylation and subsequent N-deprotection. Further functionalization by N-alkylation and bromination resulted in completely and asymmetrically substituted benzo[f]isoindole-4,9-diones. The second synthesis is based on a reductive amination of 3-(bromomethyl)-1,4-dimethoxynaphthalene-2-carbaldehyde and subsequent oxidation. (© Wiley-VCH Verlag GmbH & Co.
已开发出两种取代苯并[f]异吲哚-4,9-二酮的合成路线。一种策略依赖于通过 Kochi-Anderson 氧化脱羧方法从 1,4-萘醌和 N-三氟乙酰基-α-氨基酸开始合成 N-三氟乙酰基保护的 2-(1-氨基烷基)-1,4-萘醌。此外,已证明 2-(1-氨基烷基)-1,4-萘醌是通过溴甲基化和随后的 N-脱保护合成 1-烷基苯并[f]异吲哚-4,9-二酮的合适前体。通过 N-烷基化和溴化进一步官能化导致完全和不对称取代的苯并[f]异吲哚-4,9-二酮。第二个合成基于 3-(溴甲基)-1,4-二甲氧基萘-2-甲醛的还原胺化和随后的氧化。(© Wiley-VCH Verlag GmbH & Co. KGaA,