An iterative approach to the synthesis of thiophene-based organic dyes
摘要:
We developed an iterative synthetic method for oligo-aryl compounds using an organosilicon-based palladium-catalyzed cross-coupling reaction. Aryl compounds containing a benzyloxy(diisopropyl)silyl group (masked Si group) had sufficient chemical stability, and the unmasking step proceeded in a high yield under mild conditions. Both of the key unmasking/coupling steps required no strict anhydrous or degassed conditions. The developed procedure was used for the synthesis of thiophene-based organic dyes for dye-sensitized solar cells. (C) 2012 Elsevier Ltd. All rights reserved.
Directing group: A Pd‐catalyzed aromaticCHoxygenation has been developed, featuring a modifiable silanol‐directing group. The resulting oxasilacycles can be efficiently modified into a variety of valuable building blocks (see scheme).
导向基团:已开发出Pd 催化的芳香族 C → H 氧化反应,具有可修饰的硅烷醇导向基团。所得的草硅环可以有效地修饰成各种有价值的结构单元(参见方案)。
Mechanistic Study on the Base-Promoted Reaction of Allylphenylsilanes to Alkenylsilanols
substitution of the phenyl group with a hydroxy group took place smoothly to afford alkenylsilanol derivatives in good yields. The reaction mechanism was investigated using 18 O-labeled sulfoxide. We found that a (methylsulfinyl)methyl anion generated from DMSO participated in this reaction.
Base Promoted Preparation of Alkenylsilanols from Allylsilanes
作者:Takahiko Akiyama、Shigeaki Imazeki
DOI:10.1246/cl.1997.1077
日期:1997.10
On treatment of allyl-t-butyldiphenylsilane with t-BuOK and 18-Crown-6 in DMSO at room temperature, isomerization of the olefinic double bond and subsequent substitution of phenyl group with hydroxy group took place smoothly to afford alkenylsilanol derivatives in good yields.
that disiloxanes were effectively constructed of hydrosilanes catalyzed by gold on carbon in water as the solvent and oxidant in association with the emission of hydrogen gas at room temperature. The present oxidation could proceed via various reaction pathways, such as the hydration of hydrosilane into silanol, dehydrogenative coupling of hydrosilane into disilane, and the subsequent corresponding
We developed an iterative synthetic method for oligo-aryl compounds using an organosilicon-based palladium-catalyzed cross-coupling reaction. Aryl compounds containing a benzyloxy(diisopropyl)silyl group (masked Si group) had sufficient chemical stability, and the unmasking step proceeded in a high yield under mild conditions. Both of the key unmasking/coupling steps required no strict anhydrous or degassed conditions. The developed procedure was used for the synthesis of thiophene-based organic dyes for dye-sensitized solar cells. (C) 2012 Elsevier Ltd. All rights reserved.