Efficient Synthesis of a Complete Donor/Acceptor <i>bis</i>(Aryl)diyne Family
作者:Brian T. Holmes、William T. Pennington、Timothy W. Hanks
DOI:10.1081/scc-120021834
日期:2003.1.8
Abstract A facileroute to a family of bis(aryl)diynes containing both an electron donating pyridine ring and an electron accepting iodobenzene has been developed. The convergent synthesis involves the coupling of 2-, 3-, or 4-bromopyridine with TMS-acetylene, followed by deprotection to form the first half of the molecule. Similarly, 2-, 3-, or 4-iodoaniline was coupled to TMS-acetylene after protection
Generation of Donor/Donor Copper Carbenes through Copper-Catalyzed Diyne Cyclization: Enantioselective and Divergent Synthesis of Chiral Polycyclic Pyrroles
作者:Feng-Lin Hong、Ze-Shu Wang、Dong-Dong Wei、Tong-Yi Zhai、Guo-Cheng Deng、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.9b09303
日期:2019.10.23
yields with wide substratescope and excellent enantioselectivities (up to 97:3 e.r.). Importantly, this protocol represents the first copper-catalyzed asymmetric diyne cyclization. Moreover, mechanisticstudies revealed that the generation of donor/donor copper carbenes is presumably involved in this 1,5-diyne cyclization, which is distinctively different from the related gold catalysis, and thus it constitutes
Supramolecular Hierarchy among Halogen-Bond Donors
作者:Christer B. Aakeröy、Michele Baldrighi、John Desper、Pierangelo Metrangolo、Giuseppe Resnati
DOI:10.1002/chem.201302162
日期:2013.11.25
halogen‐bond (XB) donors. The molecular electrostatic potential surfaces of six XB donors were evaluated, which allowed for a charge‐based ranking. Each molecule was then co‐crystallized with 21 XB acceptors and the results have made it possible to map out the supramolecular landscape describing the competition between I/Br–ethynyl donors, perfluorinated I/Br donors, and I/Br–phenyl based donors. The results
Use of a closo-1,12-dicarbadecaborane backbone to link two different organic dyes separated by ca. 37 Å promotes exclusive through space electronic energy transfer with an efficiency of 81 to 87% with Stoke shifts between 4750 and 2800 cm−1 depending on the pH.
<i>p</i>-TsOH Promoted Au(I)-Catalyzed Consecutive Endo Cyclization of Yne-Tethered Ynamide: Access to Benzofused Dihydroisoquinolones
作者:Sanatan Nayak、Nayan Ghosh、B. Prabagar、Akhila K. Sahoo
DOI:10.1021/acs.orglett.5b02946
日期:2015.11.20
A novel synthetic route to benzo[f]dihydroisoquinolone through a p-TsOH promoted cascade cyclization of easily accessible diyne-tethered ynamides in the presence of a Au(I)-catalyst is described. This reaction unveils a broad substrate scope, constructing a wide range of benzo[f]dihydroisoquinolones in good yields. The diyne-tethered ynamides are synthesized from inexpensive o-iodoaniline through Sonogashira couplings and the Cu-mediated C-N bond formation. The role of p-TsOH is examined, and the reaction pathway is also deduced. The benzo[f]isoquinoline scaffold is constructed from benzo[f]dihydroisoquinolones.