作者:Joel M. Smith、Tian Qin、Rohan R. Merchant、Jacob T. Edwards、Lara R. Malins、Zhiqing Liu、Guanda Che、Zichao Shen、Scott A. Shaw、Martin D. Eastgate、Phil S. Baran
DOI:10.1002/anie.201705107
日期:2017.9.18
The development of a new decarboxylative cross‐coupling method that affords terminal and substituted alkynes from various carboxylic acids is described using both nickel‐ and iron‐based catalysts. The use of N‐hydroxytetrachlorophthalimide (TCNHPI) esters is crucial to the success of the transformation, and the reaction is amenable to in situ carboxylic acid activation. Additionally, an inexpensive
CITU: A Peptide and Decarboxylative Coupling Reagent
作者:Justine N. deGruyter、Lara R. Malins、Laurin Wimmer、Khalyd J. Clay、Javier Lopez-Ogalla、Tian Qin、Josep Cornella、Zhiqing Liu、Guanda Che、Denghui Bao、Jason M. Stevens、Jennifer X. Qiao、Martin P. Allen、Michael A. Poss、Phil S. Baran
DOI:10.1021/acs.orglett.7b03121
日期:2017.11.17
Tetrachloro-N-hydroxyphthalimide tetramethyluronium hexafluorophosphate (CITU) is disclosed as a convenient and economical reagent for both acylation and decarboxylative cross-coupling chemistries. Within the former set of reactions, CITU displays reactivity similar to that of common couplingreagents, but with increased safety and reduced cost. Within the latter, increased yields, more rapid conversion, and a
Synthesis of Polyphenylenes and Polynaphthalenes by Thermolysis of Enediynes and Dialkynylbenzenes
作者:Jens A. John、James M. Tour
DOI:10.1021/ja00090a066
日期:1994.6
Abstract : Described are the syntheses of substituted enediynes and dialkynylbenzenes using Pd- or Pd/Cu-catalyzed cross coupling procedures. The products were then thermalized, generally in benzene, to afford the corresponding poly(p-phenylene)s and poly(1,4-naphthalene)s. Thirteen examples are provided that show the scope of the polymerization process based upon substituent patterns and cyclization
Stereoselective Synthesis of (Z)-1-Alkylseleno-1-alkenes by Ni-Catalyzed Coupling Reaction of (Z)-Dialkylselenoethenes with Organozinc Halides
作者:Xian Huang、Ai Ming Sun
DOI:10.1080/00397919708004142
日期:1997.8
(Z)-Dialkylselenoethenes 2, prepared conveniently from the hydrozirconation of dialkylselenoacetylenes 1 with Cp2Zr (H) Cl in THF followed by protonolysis, react readily at − 10°C in THF with organozinchalides in the presence of a catalytic amount of NiCl2 (dppe) to give (Z)-1-alkylseleno-1-alkenes 3 with retention of the configuration.
Stereoselective Synthesis of Functionalized Trisubstituted Olefins via Palladium(0)-Catalyzed Cross-Coupling Reaction
作者:Alexander Arefolov、Neil F. Langille、James S. Panek
DOI:10.1021/ol016486l
日期:2001.10.1
[reaction: see text]. A highly flexible and stereoselective protocol for the synthesis of branched (E)- and (Z)-trisubstituted alkenes has been developed. The key steps are hydrozirconation-iodination of (1-alkynyl)trimethylsilane followed by Negishi-type cross-coupling. The resultant (Z)-vinyl silane is iododesilylated and subjected to a second cross-couplingreaction to give the trisubstituted olefin