作者:Lucia Veltri、Roberta Amuso、Marzia Petrilli、Corrado Cuocci、Maria A. Chiacchio、Paola Vitale、Bartolo Gabriele
DOI:10.3390/molecules26082318
日期:——
A straightforward approach to new polycyclic heterocycles, 1H-benzo[4,5]imidazo[1,2-c][1,3]oxazin-1-ones, is presented. It is based on the ZnCl2-promoted deprotective 6-endo-dig heterocyclization of N-Boc-2-alkynylbenzimidazoles under mild conditions (CH2Cl2, 40 °C for 3 h). The zinc center plays a dual role, as it promotes Boc deprotection (with formation of the tert-butyl carbocation, which can be
提出了一种新的多环杂环的简单方法,即1 H-苯并[4,5]咪唑并[1,2- c ] [1,3]恶嗪-1-酮。它是基于的ZnCl 2促进的脱保护6-内-挖的heterocyclization Ñ -Boc-2- alkynylbenzimidazoles温和的条件下(CH 2氯2,40℃下3小时)。锌中心起双重作用,因为它促进Boc脱保护(形成叔叔-丁基碳正离子,可被带有亲核基团的底物捕获)并激活氨基甲酸酯基团朝分子内亲核进攻的三键。代表性产品的结构已通过X射线衍射分析确认。