A one-pot I2-mediated annulation reaction of substrates containing diamino groups and aldehydes has been developed viaoxidativeC–Nbondformation. This general and environmentally benign synthetic approach provides facile access to a variety of 1,3-diazaheterocyclic compounds, including quinazolinones, benzimidazoles, and cyclic amidines.
A highly efficient heterogeneous copper-catalyzed cascade reaction of 2-halobenzoic acids and amidines leading to quinazolinones
作者:Wen He、Hong Zhao、Ruiya Yao、Mingzhong Cai
DOI:10.1039/c4ra09379h
日期:——
The heterogeneous cascade reaction of 2-halobenzoic acids and amidines was achieved in DMF at 60 °C in the presence of 10 mol% of MCM-41-immobilized tridentate nitrogen copper(I) complex [MCM-41-3N–CuI] using Cs2CO3 as base, yielding a variety of quinazolinone derivatives in good to excellent yields. This heterogeneous copper catalyst can be easily prepared from commercially available and inexpensive
2-卤代苯甲酸和am的级联反应是在60°C的DMF中,使用Cs在10 mol%的MCM-41固定的三齿氮铜(I)络合物[MCM-41-3N–CuI]存在下完成的以2 CO 3为碱,以良好或优异的产率生成各种喹唑啉酮衍生物。这种多相铜催化剂可以容易地由市售和廉价的试剂制备,并通过对反应溶液的简单过滤来回收,并且在不降低活性的情况下重复使用至少10次。
<i>ortho</i>-Naphthoquinone-catalyzed aerobic oxidation of amines to fused pyrimidin-4(3<i>H</i>)-ones: a convergent synthetic route to bouchardatine and sildenafil
作者:Kyeongha Kim、Hun Young Kim、Kyungsoo Oh
DOI:10.1039/d0ra06820a
日期:——
A facile access to fusedpyrimidin-4(3H)-one derivatives has been established by using the metal-free ortho-naphthoquinone-catalyzed aerobic cross-coupling reactions of amines. The utilization of two readily available amines allowed a direct coupling strategy to quinazolinone natural product, bouchardatine, as well as sildenafil (Viagra™) in a highly convergent manner.
通过使用无金属邻萘醌催化的胺有氧交叉偶联反应,已经建立了一种容易获得稠合 pyrimidin-4(3 H )-one 衍生物的方法。利用两种容易获得的胺,可以以高度收敛的方式直接偶联喹唑啉酮天然产物布沙达汀和西地那非 (Viagra™)。
Direct Use of Benzylic Alcohols for Multicomponent Synthesis of 2‐Aryl Quinazolinones Utilizing the π‐Benzylpalladium(II) System in Water
We demonstrate the direct use of benzylic alcohols for a multicomponent reaction of readily available isatoic anhydrides with amines in water, which is a synthetic route for the direct construction of a series of 2-aryl quinazolinones. This one-pot synthetic method involves the dehydrative N-benzylation of in situ generated anthranilamides followed by an amide-directed benzylic C−H amination process