Visible-Light-Mediated α-Arylation of Enol Acetates Using Aryl Diazonium Salts
作者:Thea Hering、Durga Prasad Hari、Burkhard König
DOI:10.1021/jo301984p
日期:2012.11.16
light mediates efficiently the α-arylation of enol acetates by aryl diazonium salts under mild conditions using [Ru(bpy)3]Cl2 as a photoredox catalyst. The broad scope of the reaction toward various diazonium salts and enol acetates was explored. The application of this reaction in the concise synthesis of 2-substituted indoles was demonstrated
Enol and vinyl esters were successfully synthesized by the use of an iridium complex as a catalyst. The reaction of carboxylic acids with terminal alkynes in the presence of catalytic amounts of [Ir(cod)Cl]2 and Na2CO3 gave the corresponding 1-alkenyl esters. The addition of carboxylic acids to alkynes principally took place in the Markovnikov fashion. In addition, by the use of an Ir complex combined
通过使用铱配合物作为催化剂成功地合成了烯醇和乙烯基酯。在催化量的[Ir(cod)Cl] 2和Na 2 CO 3的存在下,羧酸与末端炔烃的反应得到相应的1-烯基酯。羧酸向炔烃中的添加主要以马尔可夫尼可夫的方式进行。另外,通过使用与NaOAc结合的Ir配合物,通过羧酸和乙酸乙烯酯之间的转乙烯基,制备了各种乙烯基酯。
Synthesis of Trichlorophenol Derivatives
作者:Faiz Ahmed Khan、Sumit Choudhury
DOI:10.1080/00397910600946330
日期:2006.12
Abstract An expedient three‐step procedure for the synthesis of trichlorophenol derivatives based on the acid‐catalyzedrearrangement of the bicyclic ketone precursors 6a–e in high overall yield is described. The bicyclic ketone precursors 6a–e were obtained from Diels–Alder cycloadducts of β‐substituted vinyl acetates with tetrachloro‐5,5‐dimethoxycyclopentadiene in two steps.
An Efficient Synthesis of Substituted meta-Halophenols and Their Methyl Ethers: Insight into the Reaction Mechanism
作者:Faiz Ahmed Khan、Sumit Choudhury
DOI:10.1002/ejoc.201000071
日期:2010.5
methodology leading to substituted meta-halophenols and their corresponding methyl ether derivatives through acid-mediated fragmentation of suitably substituted dihalonorbornyl ketones has been devised. The reaction sequence consists of TBTH-mediated (TBTH is tri-n-butyltin hydride) selective bridgehead halogen reduction of easily accessible Diels-Alder adducts derived from 1,2,3,4-tetrahalo-5,5-di