Silver‐Catalyzed Sequential Cascade Reaction of Isocyanides with 1‐(2‐Ethynyl‐phenyl)‐prop‐2‐yn‐1‐ol: Access to Benzo[
<i>b</i>
]fluorenes and Benzofuran‐Pyrroles
作者:Jian‐Quan Liu、Xinyi Chen、Xuanyu Shen、Yihan Wang、Xiang‐Shan Wang、Xihe Bi
DOI:10.1002/adsc.201801344
日期:2019.4
A silver‐catalyzed cycloaromatization of 1‐(2‐ethynyl‐phenyl)‐prop‐2‐yn‐1‐ol with isocyanides efficiently provides benzo[b]fluorene and benzofuran‐pyrrole derivatives through a modular cascade reaction that includes a nucleophilic attack on the diyne substrate. A C−C cross‐coupling/oxygen transportation/Diels‐Alder/hydrogen shift/isomerization cascade mechanistic pathway is proposed.
银与异氰酸酯催化的1-(2-乙炔基-苯基)-丙-2-炔-1-醇的芳环芳香化反应可通过模块级联反应有效地提供苯并[ b ]芴和苯并呋喃-吡咯衍生物,包括对苯并的亲核攻击。二炔底物。提出了AC-C交叉偶联/氧迁移/ Diels-Alder /氢转移/异构化级联机制途径。
Silver Triflate Catalyzed Synthesis of Isoquinolino[2,1-a]quinazolino[3,2-c]quinazoline Derivatives via Alkyne Hydroamination
作者:Wan-Chen Pan、Mei-Mei Zhang、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1055/s-0037-1611808
日期:2019.8
only quinazoline cyclization, but also the intramolecular hydroamination of alkyne for the synthesis of 6-aryl-17H,18aH-isoquinolino[2,1-a]quinazolino[3,2-c]quinazolin-17-one derivatives in high yields. Using 2-(2-aminophenyl)quinazolin-4(3H)-one and 2-(2-phenylethynyl)benzaldehyde as the reactants, silver triflate (AgOTf) was proved to be an efficient catalyst to promote not only quinazoline cyclization
抽象的 使用2-(2-氨基苯基)喹唑啉-4(3 H)-一和2-(2-苯基乙炔基)苯甲醛作为反应物,三氟甲磺酸银(AgOTf)被证明是一种有效的催化剂,不仅可以促进喹唑啉环化,而且可以促进喹唑啉环化。还可以进行炔烃的分子内加氢胺化反应,以高产率合成6-芳基-17 H,18a H-异喹啉代[2,1- a ]喹唑啉代[3,2 - c ]喹唑啉-17-一衍生物。 使用2-(2-氨基苯基)喹唑啉-4(3 H)-一和2-(2-苯基乙炔基)苯甲醛作为反应物,三氟甲磺酸银(AgOTf)被证明是一种有效的催化剂,不仅可以促进喹唑啉环化,而且可以促进喹唑啉环化。还可以进行炔烃的分子内加氢胺化反应,以高产率合成6-芳基-17 H,18a H-异喹啉代[2,1- a ]喹唑啉代[3,2 - c ]喹唑啉-17-一衍生物。
A concise synthesis of 10-benzoyl-3,4-dihydroanthracen-1(2<i>H</i>)-one derivatives catalyzed by TfOH under metal-free conditions
作者:Hao Wu、Hua-Dong Chen、Jian-Quan Liu、Qiu-Yan Li、Xiang-Shan Wang
DOI:10.1080/00397911.2021.1912355
日期:2021.6.18
Abstract TfOH was proved to be an efficient catalyst to promote the intra-molecular cyclization, Diels-Alder reaction, deprotonation and dehydration, and provided a concise synthesis of 10-benzoyl-3,4-dihydroanthracen-1(2H)-ones in good yields from a reaction of 2-(phenylethynyl) benzaldehyde and cyclohexane-1,3-dione. It underwent in high regioselectivity when center asymmetrical 4,4-dimethylcyclohexane-1
A Cascade synthesis of 11
<i>bH</i>
‐Imidazo[1,2‐
<i>c</i>
]isoquinolino[2,1‐
<i>a</i>
]quinazoline derivatives catalyzed by AgOTf
作者:Hao Wu、Yi‐Chun Wang、Tuan‐Jie Li、Jian‐Quan Liu、Xiang‐Shan Wang
DOI:10.1002/jhet.3940
日期:2020.5
A cascade reaction of 2‐alkynylbenzaldehydes and 2‐(4,5‐diphenyl‐1H‐imidazol‐2‐yl)aniline was treated in DMF catalyzed by AgOTf leading to 6,13,14‐triaryl‐11bH‐imidazo[1,2‐c] isoquinolino[2,1‐a]quinazolines in high yields. This Domino reaction included condensation, cyclization, and acetylenic hydroamination under mild conditions to build fused pentacyclic heterocycle with three new bonds and two new
2- alkynylbenzaldehydes和2-(4,5-二苯基-1-甲级联反应ħ -咪唑-2-基)苯胺在DMF处理催化通过的AgOTf导致6,13,14三芳基11 BH咪唑并[1,2 ,2− c ]异喹啉代[2,1− a ]喹唑啉,高产。该多米诺反应包括在温和条件下的缩合,环化和炔属加氢胺化反应,以形成具有三个新键和两个新环的稠合五环杂环。
An efficient synthesis of 6‐arylpyrazolo[4′,3′:4,5]pyrimido[2,1‐a] isoquinolin‐8(9
<i>H</i>
)‐one derivatives catalyzed by AgOTf
作者:Wan‐Chen Pan、Tuan‐Jie Li、Jian‐Quan Liu、Xiang‐Shan Wang
DOI:10.1002/jhet.4428
日期:2022.5
A new AgOTf-catalyzed domino reaction of 2-alkynylbenzaldehyde and 4-amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide has been reported via a sequential condensation, cyclization, and acetylenic hydroamination process. The developed protocol provides an efficient and modular access to a range of new fused tetracyclic heterocycle 6-aryl-9-methyl-11-propyl pyrazolo[4′,3′:4,5]pyrimido[2,1-a]isoquinolin-8(9H)-ones
已经报道了一种新的 AgOTf 催化的 2-炔基苯甲醛和 4-氨基-1-甲基-3-丙基-1 H-吡唑-5-甲酰胺的多米诺反应,通过顺序缩合、环化和炔烃加氢胺化过程。所开发的协议提供了对一系列新稠合四环杂环 6-aryl-9-methyl-11-丙基吡唑并[4',3':4,5]嘧啶并[2,1- a ]异喹啉- 8(9 H )-具有两个新环的高产率。