Palladium-Catalyzed Double-Isocyanide Insertion via Oxidative N–O Cleavage of Acetyl Oximes: Syntheses of 2<i>H</i>-Pyrrol-2-imines
作者:Gopal Chandru Senadi、Ting-Yi Lu、Ganesh Kumar Dhandabani、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.7b00208
日期:2017.3.3
The palladium-catalyzedreaction of acetyl oximes with isocyanides was developed for the synthesis of 2H-pyrrol-2-imines. The key steps were (i) generation of an enamido-palladium(II) species, (ii) migratory double-isocyanide insertion, and (iii) cyclization. The scope of the synthesis of some 2H-pyrrol-2-imines was extended to the synthesis 1H-pyrrole-2,3-dione/1H-benzo[g]indole-2,3-dione derivatives
开发了钯肟基乙酰肟与异氰酸酯的反应,用于合成2 H-吡咯-2-亚胺。关键步骤是(i)生成烯胺基钯(II)物种;(ii)迁移性双异氰酸酯插入;以及(iii)环化。某些2 H-吡咯-2-亚胺的合成范围通过酸水解在1 H-吡咯-2,3-二酮/ 1 H-苯并[ g ]吲哚-2,3-二酮衍生物上得到扩展。顺序一锅法。
A copper-based catalytic system has been developed to enable formal [3 + 1 + 2] annulations of ketoxime acetates, aldehydes, and cyanamides. This protocol offers a new strategy for the synthesis of highly substituted 2-aminopyrimidine compounds, and more importantly, pyrimidines have now been included in the N-heterocycle family constructed using O-acyl ketoximes as N–C–C synthons.