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。
The regio ‐ and chemo ‐selective Pd‐catalyzedC−H activation methods have been successfully reported for directedC−H sulfonation and halogenation of pyridazinedione with arylsulfonyl chlorides and N‐halosuccinimide, respectively. These protocols are compatible with a range of various functional groups on substrates and exhibit excellent regio‐selectivity under mild reaction conditions by use of inexpensive
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。
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
Ru(II)-Catalyzed C–H Hydroxyalkylation and Mitsunobu Cyclization of <i>N</i>-Aryl Phthalazinones
作者:Kunyoung Kim、Sang Hoon Han、Daeun Jeoung、Prithwish Ghosh、Saegun Kim、Seung Jun Kim、Jin-Mo Ku、Neeraj Kumar Mishra、In Su Kim
DOI:10.1021/acs.joc.9b03228
日期:2020.2.21
Ruthenium(II)-catalyzed C(sp2)-H functionalization of N-aryl phthalazinones with a range of aldehydes and activated ketone is described. Initial formation of hydroxyalkylated phthalazinones and subsequent Mitsunobu cyclization provided facile access to biologically relevant indazolophthalazinones. The utility of this method is highlighted by synthetic transformations into a series of potentially bioactive
A novel Rh(III)-catalyzed annulation of phthalazinones or pyridazinones with various allenes was developed, leading to the formation of indazole derivatives bearing a quaternary carbon in moderate to good yields. The targeted products were synthesized via sequential C–H activation and olefin insertion, followed by β-hydride elimination and intramolecular cyclization. The synthetic protocol proceeded
开发了一种新型 Rh( III ) 催化的酞嗪酮或哒嗪酮与各种丙二烯的环化反应,从而以中等至良好的产率形成带有季碳的吲唑衍生物。目标产物通过连续的C-H活化和烯烃插入,然后是β-氢化物消除和分子内环化来合成。合成方案有效地进行,具有广泛的官能团耐受性、高原子效率和高Z选择性。通过合成转化证明了该方法的实用性。