Flash vacuum pyrolysis of 1,6-diphenyl-1,5-hexadien-3-ynes: tandem diaryldienyne cyclizations to form chrysene
作者:Motohiro Sonoda、Kayo Itahashi、Yoshito Tobe
DOI:10.1016/s0040-4039(02)01062-6
日期:2002.7
Flashvacuumpyrolysis of 1,6-diphenyl-1,5-hexadien-3-yne at 1000°C and its bromo derivative at 800°C yielded chrysene as the major product through tandem diaryldienyne cyclizations.
Enyne synthesis through a modified Sonogashira cross-coupling reaction catalyzed by cyclopalladated complexes
作者:Mengmeng Huang、Yujian Feng、Yangjie Wu
DOI:10.1016/j.tet.2011.09.110
日期:2012.1
A series of conjugated enynes were successfully synthesized by the palladacycle-catalyzed modified Sonogashira cross-coupling reaction of beta-bromostyrene and terminal alkynes. The reaction proceeds smoothly in DMSO at 40 degrees C to give the corresponding products in moderate to excellent yields. This catalytic system is tolerant to a broad range of functional groups on the substrates. Moreover, the products were furnished as specific E isomers. We also found that the product of the reaction between (E)-beta-bromostyrene and 2-methyl-3-butyn-2-ol is diarylated enyne in the presence of excess Cs2CO3. (C) 2011 Elsevier Ltd. All rights reserved.
A convenient synthesis of acetylenes: catalytic substitutions of acetylenic hydrogen with bromoalkenes, iodoarenes and bromopyridines