Concise Synthesis of Dictyoquinazol A via a Dimerisation–Cyclocondensation Sequence
摘要:
A two-step total synthesis of the neuroprotective alkaloid, dictyoquinazol A, has been achieved. The brevity of this synthesis was enabled by exploiting the hidden symmetry of the target molecule. Several structural analogues were also prepared using a similar strategy. These results provide a platform for future structure-activity relationship studies in the quest for a novel treatment for stroke.
Sustainable methine sources for the synthesis of heterocycles under metal- and peroxide-free conditions
作者:Gopal Chandru Senadi、Vishal Suresh Kudale、Jeh-Jeng Wang
DOI:10.1039/c8gc03839b
日期:——
identified as sustainable methine sources for synthesizing quinazolinone and benzimidazole derivatives using a combination of TsOH·H2O/O2 and appropriate bis-nucleophiles for the first time. Deuterium labeling studies clearly proved that the C2 hydrogen of the synthesized heterocycles came from the methine source. These unique reaction conditions were successfully applied to the synthesis of echinozolinone
首次将TsOH·H 2 O / O 2和适当的双亲核试剂组合使用,将醇和醚确定为可持续的次甲基来源,用于合成喹唑啉酮和苯并咪唑衍生物。氘标记研究清楚地证明了合成杂环的C 2氢来自次甲基。这些独特的反应条件已成功地用于合成棘金龙酮(2e'),2f'(rutaecarpine和(±)evodiamine的常见前体)和二咪唑(6d)。该方法的显着特征包括低毒性,使用商业原料作为底物,成本低,对官能团的耐受性强以及对多种双亲核起始原料的适用性。
Furan-2-carbaldehydes as C1 building blocks for the synthesis of quinazolin-4(3<i>H</i>)-ones <i>via</i> ligand-free photocatalytic C–C bond cleavage
作者:Wenjia Yu、Xianwei Zhang、Bingjie Qin、Qiyang Wang、Xuhong Ren、Xinhua He
DOI:10.1039/c8gc00079d
日期:——
efficient green C1 building blocks to synthesize bioactive quinazolin-4(3H)-ones by ligand-free photocatalytic C–C bondcleavage. Notably, protection of hydroxyl, carboxyl, amide, or secondary amino groups is not required. Mechanisticstudies suggest that conjugated N,O-tridentate copper complexes act as novel photoinitiators under visible light.
Recyclable Palladium-Catalyzed Carbonylative Coupling of 2-Iodoanilines, Trimethyl Orthoformate, and Amines: A Practical Synthesis of Quinazolin-4(3H)-ones
作者:Mingzhong Cai、Jianying Li、Zebiao Zhou、Gang Xie
DOI:10.1055/s-0040-1719924
日期:2022.8
An efficient heterogeneous palladium-catalyzedcarbonylative annulation of 2-iodoanilines, trimethyl orthoformate, and amines has been developed. The reaction proceeds smoothly in toluene at 110 °C using N,N-diisopropylethylamine (DiPEA) as base and 2 mol% of MCM-41-anchored bidentate phosphine palladium complex [MCM-41-2P-Pd(OAc)2] as catalyst under 10 bar of carbon monoxide and provides a general
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
Rhodium(III)-Catalyzed Annulation Synthesis of Difluorinated Quinazolinone Derivatives Using an Amide Carbonyl as the Directing Group
作者:Wen Luo、Chao Zhang、Lin Dong
DOI:10.1021/acs.joc.3c02596
日期:2024.7.5
The use of amide carbonylgroups of substrates as weakly coordinating directinggroups has received a significant amount of attention. Recently, difluoromethylene alkynes have been successfully used in fluorination reactions, resulting in the preparation of various fluorine-containing compounds. This work describes a [4+2] annulation method for creating a range of fluorinated quinolino[2,1-b]quinazolinone
使用底物的酰胺羰基作为弱配位导向基团已受到广泛关注。近年来,二氟亚甲基炔已成功用于氟化反应,从而制备了各种含氟化合物。这项工作描述了一种 [4+2] 成环方法,用于制备一系列氟化喹啉并[2,1- b ]喹唑啉酮衍生物。该衍生物是通过 Rh(III) 催化的 3-苯基喹唑啉酮和偕二氟亚甲基炔的级联环化形成的。