Reducing-Agent-Free Convergent Synthesis of Hydroxyimino-Decorated Tetracyclic Fused Cinnolines via Rh<sup>III</sup>-Catalyzed Annulation Using Nitroolefins
作者:Pidiyara Karishma、Chikkagundagal K. Mahesha、Sanjay K. Mandal、Rajeev Sakhuja
DOI:10.1021/acs.joc.0c02729
日期:2021.2.5
A mild Rh-catalyzed method was developed for the synthesis of hydroxyimino functionalized indazolo[1,2-a]cinnolines and phthalazino[2,3-a]cinnolines by reductive [4 + 2] annulation between 1-arylindazolones and 2-aryl-2,3-dihydrophthalazine-1,4-diones with varied nitroolefins. The targeted oxime decorated tetracyclic fused cinnolines were synthesized via sequential C–H activation/olefin insertion/reduction
开发了一种温和的Rh催化方法,通过还原1-芳基吲唑酮和2-芳基-[4 + 2]环合反应,合成羟基亚氨基官能化的吲唑并[1,2- a ] cinnolines和邻苯并[2,3- a ] cinnolines。 2,3-二氢酞嗪-1,4-二酮与各种硝基烯烃。在无还原剂的条件下,通过连续的C–H活化/烯烃插入/还原反应,合成了目标肟肟修饰的四环稠合肉桂醛。
Expedient synthesis of new cinnoline diones by Ru-catalyzed regioselective unexpected deoxygenation-oxidative annulation of propargyl alcohols with phthalazinones and pyridazinones
作者:Subramani Rajkumar、S. Antony Savarimuthu、Rajendran Senthil Kumaran、C. M. Nagaraja、Thirumanavelan Gandhi
DOI:10.1039/c5cc09347c
日期:——
Ruthenium-catalyzed simple, cascade and one-pot synthesis of cinnoline-fused diones has been carried out by the C–H activation of phthalazinones/pyridazinones.
钌催化的简单、级联和一锅法合成了咖啉并环化二酮,通过对邻苯二酮/吡啶并咪唑酮的C-H活化。
Ru(II)-Catalyzed C–H Activation and Annulation Reaction via Carbon–Carbon Triple Bond Cleavage
作者:Rashmi Prakash、Bidisha R. Bora、Romesh C. Boruah、Sanjib Gogoi
DOI:10.1021/acs.orglett.8b00643
日期:2018.4.20
An unprecedented Ru(II)-catalyzed C–H activation and annulation reaction, which proceeds via C–C triple bond cleavage, is reported. This reaction of 2-phenyldihydrophthalazinediones with alkynes, which works most efficiently in the presence of bidented ligand 1,3-bis(diphenylphosphino)propane, affords good yields of substituted quinazolines.
Phthalazinone-Assisted C–H Amidation Using Dioxazolones Under Rh(III) Catalysis
作者:Daeun Jeoung、Kunyoung Kim、Sang Hoon Han、Prithwish Ghosh、Suk Hun Lee、Saegun Kim、Won An、Hyung Sik Kim、Neeraj Kumar Mishra、In Su Kim
DOI:10.1021/acs.joc.0c00352
日期:2020.6.5
agents and other entities. Herein, we report the phthalazinone-assisted carbon–nitrogen bond forming reaction using dioxazolones as robust amidation sources under Rh(III) catalysis. The broad functional group tolerance and complete site-selectivity are observed. Notably, a series of transformations of synthesized compounds into biologically relevant N-heterocycles demonstrates the applicability of the developed
Ruthenium Catalyzed C−H Amidation and Carbocyclization using Isocyanates: An Access to Amidated 2‐phenylphthalazine‐1,4‐diones and Indazolo[1,2‐
<i>b</i>
]phthalazine‐triones
作者:Pidiyara Karishma、Alisha Gogia、Sanjay K. Mandal、Rajeev Sakhuja
DOI:10.1002/adsc.202001146
日期:2021.2.2
A direct carbocyclization of 2‐aryl‐2,3‐dihydrophthalazine‐1,4‐diones is achieved using isocyanates as carbonyl source via Ru(II)‐catalyzed sequential ortho‐amidation followed by intramolecular nucleophilic substitution, delivering substituted indazolo[1,2‐b]phthalazine‐triones in good‐to‐excellent yields. For ortho‐substituted 2‐aryl‐2,3‐dihydrophthalazine‐1,4‐diones, the corresponding amidated products
使用异氰酸酯作为羰基来源,通过Ru(II)催化的顺序邻位酰胺化反应,然后进行分子内亲核取代,将取代的吲唑并[ 2,2-]-2-芳基-2,3-二氢酞嗪-1,4-二酮直接碳环化[1,2] ‐ b ]酞嗪三酮,收率良好。对于邻位取代的2-芳基-2,3-二氢邻苯二甲酸1,4-二酮,还可以通过修改反应参数以高收率分离出相应的酰胺化产物。异氰酸酯作为羰基来源的应用,在两个偶联配偶体上的高官能团耐受性以及合成的熔融和官能化邻苯二氮酮的多种化学转化是这项工作的重点。