Synthesis of 2-Amino 3-Substituted Quinazolin-4(3H)-one DerivativesviaIodine-Mediated Guanidinylation of Pbf-Activated Thiourea
摘要:
2‐Amino 3‐substituted‐quinazolin‐4(3H)‐one derivatives were synthesized from Pbf‐isothiocyanate and methyl anthranilate. The construction of the guanidine‐containing quinazolinone heterocyclic skeleton was achieved using Pbf‐activated thiourea treated with primary amines via iodine‐mediated guanidinylation. The desired compounds were obtained after Pbf cleavage by trifluoroacetic acid.
An efficient one pot synthesis of 2-amino quinazolin-4(3 H )-one derivative via MCR strategy
作者:V. Narayana Murthy、Satish P. Nikumbh、S. Praveen Kumar、L. Vaikunta Rao、Akula Raghunadh
DOI:10.1016/j.tetlet.2015.08.040
日期:2015.10
multi-component reaction strategy was developed for the construction of important building blocks, 2-amino 3-substituted quinazolinone derivatives from isatoic anhydride and amine with electrophilic cyanating compound, N-cyano-4-methyl-N-phenylbenzenesulfonamide (NCTS). The quinazolinone synthesis proceeds via a sequential series of reactions such as nucleophilic attack of the amine group on the carbonyl group
the Dimroth rearrangement in aqueous ethanolic sodium hydroxide gave exclusively the regioisomers, 2-(N-arylamino)quinazolin-4-ones. The regioselective synthesis of N-aryl-substituted 2-aminoquinazolin-4-ones can be further applied to the synthesis of benzimidazo[2,1-b]quinazolin-12-ones.
在对-TsOH存在下,在t- BuOH中,在回流下,邻氨基苯甲酸甲酯与N-芳基氰酰胺的反应主要得到3-芳基喹唑啉-4-酮。相比之下,相同的反应物与TMSCl在60°C的t- BuOH中反应,然后在乙醇氢氧化钠水溶液中进行Dimroth重排,仅得到区域异构体2-(N-芳基氨基)喹唑啉-4-酮。N-芳基取代的2-氨基喹唑啉-4-酮的区域选择性合成可以进一步应用于苯并咪唑并[2,1- b ]喹唑啉-12-酮的合成。
Pyridyl Glycosyl Triazole/CuI-Mediated Domino/Tandem Synthesis of Quinazolinones
作者:Sumit K. Singh、Sunil Kumar、Mangal S. Yadav、Vinod K. Tiwari
DOI:10.1021/acs.joc.2c01951
日期:2022.11.18
The glycosyl 1,2,3-triazoles are expediently accessible from readily available sugar-derived glycosyl azide by utilizing modular CuAAC “ClickChemistry”, and the resulting glycohybrid skeleton possesses efficient metal-coordinating centers that support a wide range of metal-mediated efficient catalysis in various imperative organic transformations. Here, we designed and developed pyridyl glycosyl triazoles