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이용록 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Tandem annulation has attracted great interest owing to their exceptional synthetic efficiency. This reaction plays a pivotal role in construction of aromatics and heteroaromatics for the use of pharmacological and highly advanced materials. Transition-metal-catalyzed tandem annulation are well-established, but most of these methods suffer from drawbacks including the necessity of expensive metal catalysts and harsh reaction conditions. Therefore, more environmentally benign tandem annulation approaches are highly desirable to improve on these shortcomings. Herein, I present transition-metal-free tandem annulation for the construction of various functionalized aromatics and heteroaromatics.
이용록,Xin Li,이승우,용철순,Ma-Ro Hwang,류원석 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.6
A new and efficient synthetic approach is reported for biologically interesting prenylated chalcones, 4'-Omethylxanthohumol (3), xanthohumol E (4), and sericone (5) from 2,4,6-trihydroxyacetophenone. The strategies involve the introduction of a prenyl group onto an aryl ring, benzopyran formation, and basecatalyzed aldol reactions.
Concise Synthesis of Biologically Interesting Mollugin and Its Analogues
이용록,Xue Wang,Yun Mi Kim,심재진,김병남,한도흥 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.10
The synthesis of naturally occurring mollugin and its analogues, 3,4-dihydromollugin, cis-3,4-dihydroxy-3,4-dihydromollugin, and trans-3,4-dihydroxy-3,4-dihydromollugin was achieved starting from 1,4-dihydroxynaphthalene-2-carboxylic acid. The key reaction is an electrocyclization for pyranyl ring formation in the presence of PhB(OH)2/AcOH.
趙玟亨,李容祿 金烏工科大學校 産業技術開發硏究院 1998 産業技術開發硏究 Vol.14 No.-
In this paper we would like to improve Thomas type results by weakening the compactness assumption of the domain space. It is well known that every compact space must be countably compact but the converse fails so we would like to establish Thomas type results for sequentially compact spaces and countably compact spaces.
Lee, Yong Rok,Kweon, Hyuk Il,Koh, Wha Soo,Min, Kyung Rak,Kim, Youngsoo,Lee, Seung Ho 영남대학교 약품개발연구소 2002 영남대학교 약품개발연구소 연구업적집 Vol.11 No.-
An efficient synthesis of pyranoquinolinones is achieve by ytterbium(III) triflate-catalyzed reaction of 4-hydroxy-2-quinolones with a variety of α,β-unsaturated aldehydes in moderate yields. This new method has been applied to the synthesis of pyranoquinolinone alkaloids.
Lee, Yong-Rok,Hwang, Jae-Cheol,Kim, Nam-Woo 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2
Rhodium(Ⅱ)-catalyzed cycloadditions of diazodicarbonyl compounds with a variety of conjugated dienes have been examined. These reactions provide a simple and rapid route to dihydrofurans and dihydrooxepines with a variety of substituents an the ring. The formation of these products have been interpreted in terms of a step-wise mechanism.
L-Proline-Catalyzed Construction of Polyfunctionalized Pyridines via Oxidative N- Annulation
카날하리더더,이용록 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Pyridines and their derivatives are fundamental heterocyclic compounds contained in natural products and pharmaceuticals. They are also used in the synthesis of bioactive natural products and materials with photoor electrochemical properties. Representative methods for the synthesis of pyridine derivatives mainly include condensation of 1,3-dicarbonyl compounds and organocatalyzed cycloaddition reactions. However, environmentally benign methods for the synthesis of pyridines are still highly desirable. Herein, we present L-proline catalyzed reaction for highly functionalized pyridines starting from ketones, α,β-unsaturated aldehydes, and ammonium acetate. This protocol proceeds via N-annulation through C-C and C-N bond formation in a single step.