Boroquinol Complexes with Fused Extended Aromatic Backbones: Synthesis and Optical Properties
作者:Sven M. Elbert、Philippe Wagner、Thines Kanagasundaram、Frank Rominger、Michael Mastalerz
DOI:10.1002/chem.201604421
日期:2017.1.18
Boron‐based dyes are attractive synthetic targets due to their large variability of absorption and emission wavelengths. Through Pictet–Spenglercyclizations, followed by oxidation, π‐extended boroquinols have been synthesized. During optimization of the reaction conditions, an unusual dearylation has been found and mechanistically investigated. For two of the synthesized boroquinols, mechanochromic
作者:Sven M. Elbert、Martin Reinschmidt、Kevin Baumgärtner、Frank Rominger、Michael Mastalerz
DOI:10.1002/ejoc.201701796
日期:2018.1.31
In a two‐step approach, using a Pictet–Spengler cyclization followed by a thermally induced ring‐closing reaction, a variety of planar oxygen‐containing 2D polyaromatics with distinct photophysical properties are accessible.
A novel and convenient cascade trifluoroethylation/cyclization of organic isoselenocyanates by phenyl(2,2,2-trifluoroethyl)iodonium triflate is reported. A series of 2-isoselenocyanobiaryls and aryl alkyl isoselenocyanates reacted with phenyl(2,2,2-trifluoroethyl)iodonium triflate in CH2Cl2 at 40 °C under metal- and additive-free conditions for 3 h to provide the corresponding trifluoroethylselenolated
Catalytic Synthesis of Dibenzazepines and Dibenzazocines by 7‐
<i>Exo</i>
‐ and 8‐
<i>Endo</i>
‐
<i>Dig</i>
‐Selective Cycloisomerization
作者:Mamoru Ito、Asahi Takaki、Moeka Okamura、Kyalo Stephen Kanyiva、Takanori Shibata
DOI:10.1002/ejoc.202001643
日期:2021.3.19
The cationic Au(I)‐catalyzed reaction achieved 7‐exo‐dig‐selective cycloisomerization of 2‐propargylamino‐N‐tosylbiphenyls with terminalalkyne along with the construction of a dibezazepine skeleton. In addition, the reaction of internal alkynes gave 8‐endo‐dig‐selective products. This strategy could be used for the ynamide substrate and the intramolecular reaction provided 7‐exo‐dig‐selctive cycloadducts
Selective synthesis of 5,6-dihydrophenanthridines, 5,6-dihydrobenzo[c][1,8]naphthyridines and their fully aromatized analogues via the Pictet–Spengler reaction mediated by peptide coupling agent propylphosphonic anhydride (T3P)
A new method has been developed for the selective synthesis of 5,6-dihydrophenanthridines, 5,6-dihydrobenzo[c][1,8]naphthyridines and their fully aromatized analogues via the Pictet–Spengler reaction mediated by propylphosphonic anhydride (T3P). The method, which uses less toxic and readily available T3P, generally seems to be more flexible, efficient in the preparation of 5,6-dihydrophenanthridine
已开发出一种新方法,用于通过丙基膦酸酐(T3P)介导的Pictet-Spengler反应选择性合成5,6-二氢菲啶,5,6-二氢苯并[ c ] [1,8]萘啶及其完全芳构化的类似物。使用毒性较小且易于获得的T3P的方法通常似乎更灵活,更有效地制备5,6-二氢菲啶衍生物,并且与制备吡啶的常规方法相辅相成。