Creation of nanoscale oxaarenecyclynes and their C60 complexes
摘要:
Novel nanoscale oxaarenecyclynes (3 and 4) consisting of diethynylbenzene and ether units were synthesized, which form supramolecular complexes with C-60. (C) 2002 Elsevier Science Ltd. All rights reserved.
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
A new strategy for constructing enantiopure acetylenic cyclophanes is described on the basis of one-pot double elimination reaction starting from dialdehydes and bis(sulfoximine)s. In this case, the conventional sulfone protocol affords poorer yields of the desired cyclophanes. Thus, arylene-ethynylene moieties with terminal sulfoximine or formyl functions are linked to binaphthyl cores and these building blocks are then subjected to double elimination reaction. The desired macrocycles are obtained in up to 35% yield. The corresponding Sonogashira coupling fails to afford cyclophanes indicative of effectiveness of the double elimination methodology.
N<sub>2</sub> Extrusion and CO Insertion: A Novel Palladium-Catalyzed Carbonylative Transformation of Aryltriazenes
作者:Wanfang Li、Xiao-Feng Wu
DOI:10.1021/acs.orglett.5b00603
日期:2015.4.17
A novel procedure for the replacement of N-2 with CO of aryltriazenes has been developed. Aryltriazenes were converted to the corresponding arylamides catalyzed by 1 mol % of PdCl2/P(o-Tol)(3) under CO pressure. In this process, aryldiazonium salts were generated in the presence of 40 mol % of MeSO3H. Nitrogen was released from the substrates and CO formally inserted. Aryl bromides, iodides, alkynes, and free hydroxyl groups can be tolerated in this transformation.