由N-苯基磺酰基吲哚通过锂化,用D 2 O淬灭并水解来制备2-氘代吲哚。用琥珀酸酐处理2-氘代吲哚格利雅试剂,得到4-(吲哚-3-基)-4-氧代丁酸,氘从2-位部分损失。以相同方式处理的2,3-二氘代吲哚(通过酸催化的2-氘代吲哚的氘代制备)得到吲哚基2-氧代丁酸,其在吲哚基2-位的氘代率为92%。还原为氘代吲哚基丁醇并用叔丁醇钾处理其甲苯对磺酸盐,得到2-氘代-螺[环戊烷-3'-(3 H)吲哚]在2位上氘化了88%。测量了氘代吲哚及其非氘代类似物的酸催化重排动力学,发现拟一级速率常数的比值k H / k D为1.08,表明同位素效应非常小。
由N-苯基磺酰基吲哚通过锂化,用D 2 O淬灭并水解来制备2-氘代吲哚。用琥珀酸酐处理2-氘代吲哚格利雅试剂,得到4-(吲哚-3-基)-4-氧代丁酸,氘从2-位部分损失。以相同方式处理的2,3-二氘代吲哚(通过酸催化的2-氘代吲哚的氘代制备)得到吲哚基2-氧代丁酸,其在吲哚基2-位的氘代率为92%。还原为氘代吲哚基丁醇并用叔丁醇钾处理其甲苯对磺酸盐,得到2-氘代-螺[环戊烷-3'-(3 H)吲哚]在2位上氘化了88%。测量了氘代吲哚及其非氘代类似物的酸催化重排动力学,发现拟一级速率常数的比值k H / k D为1.08,表明同位素效应非常小。
Platinum-Catalysed Bisindolylation of Allenes: A Complementary Alternative to Gold Catalysis
作者:María Paz Muñoz、María C. de la Torre、Miguel Angel Sierra
DOI:10.1002/chem.201103337
日期:2012.4.10
Pt versus Au: Platinum‐catalysed addition of nucleophiles to allenes follows a distinctly different pathway to the process catalysed by gold(I) complexes; the platinum catalyst leads to different products with indoles involving a bisindolylation reaction, whereas gold(I) gives allyl indoles from a single addition (see scheme).
Pt vs Au:铂催化的亲核试剂向丙二烯的加成遵循截然不同的金(I)络合物催化的过程。铂催化剂可生成涉及双吲哚基化反应的吲哚的不同产物,而金(I)只需一次添加即可生成烯丙基吲哚(参见方案)。
Ethynyl Benziodoxolones for the Direct Alkynylation of Heterocycles: Structural Requirement, Improved Procedure for Pyrroles, and Insights into the Mechanism
作者:Jonathan P. Brand、Clara Chevalley、Rosario Scopelliti、Jérôme Waser
DOI:10.1002/chem.201200200
日期:2012.4.27
accelerating effect of a methyl substituent in both the 3‐ and 6‐position of triisopropylsilylethynyl‐1,2‐benziodoxol‐3(1H)‐one (TIPS‐EBX) on the reaction rate was observed. Competitive experiments between substrates of different nucleophilicity, deuterium labeling experiments, as well as the regioselectivity observed are all in agreement with electrophilic aromatic substitution. Gold(III) 2‐pyridinecarboxylate
One-Pot Synthesis of Symmetric and Unsymmetric 1,1-Bis-indolylmethanes via Tandem Iron-Catalyzed C−H Bond Oxidation and C−O Bond Cleavage
作者:Xingwei Guo、Shiguang Pan、Jinhua Liu、Zhiping Li
DOI:10.1021/jo902093p
日期:2009.11.20
The reactions of indoles with ethers give a variety of symmetric and unsymmetric 1,1-bis-indolylmethane derivatives via iron-catalyzed C−H bond oxidation and C−O bond cleavage.
A protocol for the synthesis of terminal N-vinylazoles from aromatic aldehydes, DMSO, and azoles has been reported. In this strategy, DMSO was involved in the construction of the C=C bond as a terminal carbon synthon. Both aromatic aldehydes and azoles could be well tolerated and give the corresponding terminal N-vinylazoles in 52–91% yields. Based on preliminary experiments, a plausible mechanism
Iridium-Catalyzed, Intermolecular Hydroamination of Unactivated Alkenes with Indoles
作者:Christo S. Sevov、Jianrong (Steve) Zhou、John F. Hartwig
DOI:10.1021/ja412116d
日期:2014.2.26
The addition of an N-H bond to an olefin is the most direct route for the synthesis of alkylamines. Currently, intermolecular hydroamination is limited to reactions of a narrow range of reagents containing N-H bonds or activated alkenes, and all the examples of additions to unactivated alkenes require large excesses of alkene. We report intermolecular hydroamination reactions of indoles with unactivated