I<sub>2</sub>-mediated coupling of quinazolinone enamines with 2-aminopyridines: a new strategy to access spiroquinazolinones
作者:Jingxi Fang、Zhentao Pan、Tong Liu、Yingbo Rao、Huajiang Jiang、Yongmin Ma
DOI:10.1039/d3ob00083d
日期:——
A novel metal-free and mild strategy for the construction of spiroquinazolinone iodides and imidazo[1,2-a]pyridine via an umpolung strategy mediated by molecular iodine is described.
Metal-free construction of dihydropyrazino[2,3-<i>b</i>]indoles from 2-aminoacetophenones, isocyanates and 1,2-diamines
作者:Jingxi Fang、Jiayao Fang、Yingbo Rao、Huanyi Qiu、Zhentao Pan、Yongmin Ma
DOI:10.1039/d3ob01967e
日期:——
A Brønsted acid/iodine co-mediated approach to construct dihydropyrazino[2,3-b]indoles in 2-MeTHF as a green solvent at room temperature was established. A wide range of diversely substituted dihydropyrazino[2,3-b]indoles (42 examples, 61–85% yields) were synthesized under mild conditions, even on a gram scale. This protocol features organocatalysts, an eco-friendly solvent, mild conditions, readily
建立了在室温下以 2-MeTHF 作为绿色溶剂构建二氢吡嗪并[2,3- b ]吲哚的布朗斯台德酸/碘共介方法。在温和条件下合成了多种不同取代的二氢吡嗪并[2,3- b ]吲哚(42 个实例,产率 61-85%),甚至是克级的。该方案具有有机催化剂、环保溶剂、条件温和、底物易于获取、底物范围广泛和操作简单等特点。
Efficient access to spiro[quinazoline-thiophen](thi)ones via acetic acid mediated [3 + 2] annulation of quinazolin(thi)one enamines with dithianediol