Cu-Catalyzed Chemoselective Reduction of N-Heteroaromatics with NH3·BH3 in Aqueous Solution

来源 :中国化学(英文版) | 被引量 : 0次 | 上传用户:rockwjm
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Main observation and conclusionrnAn efficient catalytic system was successfully developed on reduction of N-heteroaromatics with H3N·BH3 as hydrogen source in CuSO4 solution,featuring excellent chemoselectivity as well as very broad functional group tolerance.Various challenging substrates,such as OH-,NH2-,Cl-,Br-,etc.,contained quinolines,quinoxalines,1,5-naphthyridines and quinazolines were all reduced smoothly.Mechanistic studies suggested that [Cu-H] intermediate might be generated from NH3·BH3,which was believed to form with H3N·BH3 in CuSO4 solution.
其他文献
Main observation and conclusionrnDivergent synthesis of useful skeletons has been realized via rhodium(Ⅲ)-catalyzed C-H activation of iminopyridinium ylides and coupling with various unsaturated coupling reagents.Isocoumarins and isoquinolones were obtain
Main observation and conclusionrnAn efficient method for the activation of C-terminal 4-mecaptoproline-or penicillamine-containing peptide hydrazides in ligation re-actions is reported herein.The corresponding peptide hydrazides can be readily prepared us
Main observation and conclusionrnEnantioselective resolution copolymerization of racemic internal epoxides with carbon dioxide (CO2) is a challenging issue because of their poor reactivity and complicated regio/stereoselectivity.Herein,we describe the fir
Main observation and conclusionrnThe radical S-adenosylmethionine (SAM) enzyme NosL catalyzes the conversion of L-tryptophan (L-Trp,1) to 3-methyl-2-indolic acid(MIA,2),a key intermediate in the biosynthesis of the peptide antibiotic nosiheptide.Previous
Due to the complex dynamic of aeolian and fluvial interacted processes behind the landform development, most of previous works started from classifying the types of landscape characterized by various
Main observation and conclusionrnA convenient synthetic route to 2-heteroaryl-3-hydroxybenzo[b]thiophene derivatives via K2CO3-promoted multicomponent cycliza-tion between o-halogenated benzaldehyde,2-methylquinolines and sulfur powder has been demonstrat
Main observation and conclusionrnSubstantial progresses have been made toward the development of metal-free catalysts for stereoselective ring-opening polymeriza-tion (ROP) of rac-lactide.Yet the discovery of organic catalysts effective at ambient tempera
Main observation and conclusionrnA series of catalysts were prepared for sugar alcohols production to overcome the deficiencies of the previous reported catalysts,such as low yield of sugar alcohols,single function,instability,and controversial role of ac
Main observation and conclusionrnThe synthesis of an Asp lactam derivative of A-183,a selective inhibitor of Factor 7a with good anticoagulant and antithrombotic ac-tivity,is described.Our synthesis depends on the use of a removable backbone modification
This study was conducted on the Ngaoundaba Crater Lake sediments to infer provenance,weathering conditions,organic matter accumulation,and trace metal concentrations.Ngaoundaba Lake sediments were col-lected using a manual core sampler at 5 to 8 m water d