Synthesis of 1-(2-ethynyl-6-methylphenyl)- and 1-(2-ethynyl-6-methoxyphenyl)-naphthalene and their cyclization
作者:Jan Storch、Jan Čermák、Jindřich Karban
DOI:10.1016/j.tetlet.2007.07.105
日期:2007.9
A Suzuki cross-coupling reaction of hindered 2-bromo-1-trimethylsilylethynylbenzenes with 1-naphthaleneboronic acid yielding (2-ethynylphenyl)naphthalenes has been achieved. Their subsequent cyclization was carried out, giving benzo[c]phenanthrenes, without the use of photochemical procedures.
已实现受阻2-溴-1-三甲基甲硅烷基乙炔基苯与1-萘硼酸的Suzuki交叉偶联反应,生成(2-乙炔基苯基)萘。他们随后进行环化反应,得到苯并[ c ]菲,而无需使用光化学方法。
Heterohelicenes through 1,3-Dipolar Cycloaddition of Sydnones with Arynes: Synthesis, Origins of Selectivity, and Application to pH-Triggered Chiroptical Switch with CPL Sign Reversal
of the transformation. From the library of 24 derivatives synthesized, a pyridyl containing derivative displayed reversible, red-shifted, pH-triggered chiropticalswitchingproperties, with CPL-sign reversal. It is found that protonation of the helicene causes a change of the angle between the electric and magnetic dipole moments related to the S1 → S0 transition, resulting in this rare case of reversible