Studies of C-C and C-N bond forming reactions via rhodium-catalyzed C-H bond activation = 로듐 촉매의 탄소-수소결합 활성화를 통한 탄소-탄소, 탄소-질소결합 형성반응에 관한 연구

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Aryl amines are a key synthetic unit widely utilized in organic synthesis, coordination chemistry, materials science and in the pharmaceutical industry. Current synthetic routes to those compounds require either pre-functionalized starting materials or external oxidants, thus inevitably generating stoichiometric amounts of harmful side products. The efforts on overcoming these disadvantages in various methods. In other words, studies of C-C bond and C-N bond forming reactions via C-H activation were developed to broaden the usage of reaction in industry. Especially, C-H funtionalization using pentamethylcyclopentadienyl ligand and rhodium catalyst developed recently. Various functionalized arene derivatives could be made using this catalytic system via C-H bond activation. First, A new catalytic procedure of ortho-olefination of benzoates and benzaldehydes has been developed. Ester and carboxyaldehyde units were revealed to be effective chelating groups in focusing the activation of aryl C-H bonds ortho to the directing moieties under Rh-catalyzed oxidative conditions. The rhodium-catalyzed selective olefination is highly regioselective with a range of benzoates and benzaldehydes enabling efficient olefination with acrylates, acrylic acid, and styrenes. Second, we report herein a direct amidation reaction of arene carbon-hydrogen (C-H) bonds using sulfonyl azides as a source of the nitrogen group to release molecular nitrogen as the innocuous by-product. The reaction is catalyzed by a cationic rhodium complex without external oxidant and under atmospheric environment. A broad range of chelate group-containing arenes can be selectively amidated with excellent functional group tolerance, thereby opening up a new avenue to environmentally benign carbon-nitrogen (C-N) bond formation which can be immediately applied to various important schemes. Third, our recently reported Rh(III)-catalyzed C-N bond formation reactions where chelating group containing arene and a...
Advisors
Chang, Suk-Bokresearcher장석복
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
514003/325007  / 020088028
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2013.2, [ iv, 74 p. ]

Keywords

탄소-탄소 결합; 탄소-수소 결합 활성; Amidation; Olefination; Rhodium; Mechanism; Sulfonyl azide; Ester; C-N bond formation; C-C bond formation; C-H bond activation; 탄소-질소 결합; 에스테르; 술폰 아지드; 메카니즘; 로듐; 올레핀화반응; 아미드화반응; 아민화반응; Amination

URI
http://hdl.handle.net/10203/180280
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=514003&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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