Synthesis of Bicyclic p-Diiodobenzenes via Silver-Catalyzed Csp-H Iodination and Ruthenium-Catalyzed Cycloaddition
摘要:
Highly substituted iodobenzenes were efficiently and regioselectively synthesized from readily available 1,6-diynes via two-step process consisting of silver-catalyzed Csp-H iodination and subsequent ruthenium-catalyzed [2+2+2] cycloaddition of resultant iododiynes. Some of the obtained iodobenzenes were subjected to palladium-catalyzed C-C bond-forming reactions such as Mizoroki-Heck reaction, Sonogashira reaction, and Suzuki-Miyaura coupling, giving highly conjugated molecules.
我们报告了通过钴介导的(2-氰基苯基)-二甲基硼烷与不同二炔的环三聚反应合成了一系列八个 N → B-梯级硼烷。所得四配位硼烷根据配位吡啶衍生物骨架中的取代模式显示出不同的电化学和光学性质。虽然含有烷基取代的吡啶的硼烷比已知的母体化合物显示出较低的电子亲和力,但具有 π 扩展吡啶衍生物的硼烷在受体取代的三芳基硼烷范围内显示出更高的电子亲和力。与未取代吡啶配位的 N → B-梯形硼烷相比,所有衍生物都显示出更大的斯托克斯位移 (8790–6920 cm –1 )。
Silver-Catalyzed Selective Multicomponent Coupling Reactions of Arynes with Nitriles and Isonitriles
作者:Sourav Ghorai、Yongjia Lin、Yuanzhi Xia、Donald J. Wink、Daesung Lee
DOI:10.1021/acs.orglett.9b04416
日期:2020.1.17
multicomponent coupling reactions with isonitriles and nitriles are described. Crucial to these reactions is the formation of a silver-aryne complex, which shows differential reactivity toward isonitriles and nitriles to form two different forms of ortho-nitrilium organosilver arene species. Interception of the nitrilium of an aryne-isonitrile adduct with another isonitrile leads to the formation of
Preparation of Structurally and Electronically Diverse N → B-Ladder Boranes by [2 + 2 + 2] Cycloaddition
作者:Jonas D. W. Schepper、Andreas Orthaber、Frank Pammer
DOI:10.1021/acs.joc.1c01402
日期:2021.11.5
We report the synthesis of a series of eight N → B-ladder boranes through cobalt-mediated cyclotrimerization of (2-cyanophenyl)-dimesitylborane with different dialkynes. The resulting tetracoordinate boranes show variable electrochemical and optical properties depending on the substitution pattern in the backbone of the coordinating pyridine-derivatives. While boranes containing alkyl-substituted pyridines
我们报告了通过钴介导的(2-氰基苯基)-二甲基硼烷与不同二炔的环三聚反应合成了一系列八个 N → B-梯级硼烷。所得四配位硼烷根据配位吡啶衍生物骨架中的取代模式显示出不同的电化学和光学性质。虽然含有烷基取代的吡啶的硼烷比已知的母体化合物显示出较低的电子亲和力,但具有 π 扩展吡啶衍生物的硼烷在受体取代的三芳基硼烷范围内显示出更高的电子亲和力。与未取代吡啶配位的 N → B-梯形硼烷相比,所有衍生物都显示出更大的斯托克斯位移 (8790–6920 cm –1 )。
Synthesis of polymetallic macrocyclic terpene-derived hybrids
作者:Elsa Álvaro、María C. de la Torre、Miguel A. Sierra
DOI:10.1039/b515270d
日期:——
Terpene alkyne systems act as templates in the preparation of natural product hybrids and in macrocyclic structures having up to four terpene units and eight Co-atoms, which are built by using the Nicholas reaction.
Synthesis of Imides, Imidates, Amidines, and Amides by Intercepting the Aryne–Isocyanide Adduct with Weak Nucleophiles
作者:Sourav Ghorai、Daesung Lee
DOI:10.1021/acs.orglett.9b02711
日期:2019.9.20
have been developed. Arynes generated from triynes or tetraynes through the hexadehydro Diels-Alder reaction readily react with isocyanide to generate nitrilium intermediate. Intercepting this nitrilium species with various weak nucleophile including carboxylic acids, alcohols, sulfonamides, or water generated the corresponding imides, imidates, amidines, or amides. The high regioselectivity of these
Silver-Catalyzed Annulation of Arynes with Nitriles for Synthesis of Structurally Diverse Quinazolines
作者:Sourav Ghorai、Yongjia Lin、Yuanzhi Xia、Donald J. Wink、Daesung Lee
DOI:10.1021/acs.orglett.9b04395
日期:2020.1.17
An efficient silver catalyzed annulation reaction of aryne with nitriles to generate quinazolines is described. Arynes generated from triynes or tetraynes through a hexadehydro Diels-Alder reaction readily participated in an [A + 2B] mode of annulation with nitriles in the presence of AgSbF6 catalyst. The mechanism was explored by DFT calculations, which supports the silver-catalyzed formation of nitrilium