Preparation and Stille cross-coupling reaction of the first organotin reagents of azulenes. Easy access to poly(azulen-6-yl)benzene derivatives

Author(s):  
Shunji Ito ◽  
Tetsuo Okujima ◽  
Noboru Morita
Synthesis ◽  
2020 ◽  
Vol 52 (13) ◽  
pp. 1947-1958
Author(s):  
Tsutomu Konno ◽  
Gen Egashira ◽  
Chihiro Kajimoto ◽  
Takuto Kataoka ◽  
Shigeyuki Yamada

On treating 1,3,4-tribromo-1,1,2,2-tetrafluorobutane, readily prepared from commercially available 4-bromo-3,3,4,4-tetrafluorobut-1-ene, with 3.3 equivalents of LHMDS at 0 °C in THF, the corresponding lithium acetylide could be prepared quantitatively. The acetylide reacted well with various aldehydes, ketones, or chlorosilanes to give the corresponding acetylene derivatives in high yields. It was also found that various iodoarenes could participate in the cross-coupling reaction with the zinc acetylide, readily prepared from the lithium acetylide and ZnCl2·TMEDA complex, in the presence of Pd(PPh3)4 to bring about the adducts in high yields. Thus-obtained acetylene derivatives underwent smooth Diels–Alder reaction with various 1,3-dienes to afford the corresponding 1,4- or 1,3-cyclohexadiene derivatives. In addition, it was revealed that the oxidative aromatization of the resulting cyclohexadiene derivatives with DDQ took place very smoothly, providing the multi-substituted benzene derivatives having a tetrafluoro­ethylene group.


ChemInform ◽  
2004 ◽  
Vol 35 (39) ◽  
Author(s):  
Shunji Ito ◽  
Tomomi Terazono ◽  
Takahiro Kubo ◽  
Tetsuo Okujima ◽  
Noboru Morita ◽  
...  

Tetrahedron ◽  
2004 ◽  
Vol 60 (25) ◽  
pp. 5357-5366 ◽  
Author(s):  
Shunji Ito ◽  
Tomomi Terazono ◽  
Takahiro Kubo ◽  
Tetsuo Okujima ◽  
Noboru Morita ◽  
...  

2011 ◽  
Vol 64 (3) ◽  
pp. 316 ◽  
Author(s):  
Nigel A. Lengkeek ◽  
Ramiz A. Boulos ◽  
Allan J. McKinley ◽  
Thomas V. Riley ◽  
Boris Martinac ◽  
...  

A highly efficient synthesis of p-carboethoxy-tristyryl and carboethoxy-terastyrenyl benzene derivatives through a multiple Heck cross coupling reaction is reported. This reaction provides an efficient route to DNA intercalator precursors containing a benzene core.


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