A modular synthesis of a series of methoxy substituted optically pure aromatic triynes (-)-(S)-5-9 and (-)-(R)-10 is presented. It relies on key operations such as substitution of benzylic bromine with an alkoxy group and aryl-alkyne coupling reaction to combine appropriate methoxy substituted benzene/naphthalene building blocks and chiral alkynol synthons such as (-)-(2S)-but-3-yn-2-ol and (-)-(1R)-1-phenylprop-2-yn-1-ol. The triyne molecules comprise a diphenylacetylene, 1-(phenylethynyl)naphthalene or 1,1'-ethyne-1,2-diyldinaphthalene core unit. They are intended to serve as [2+2+2] cyclisation precursors of methoxy substituted nonracemic helicene-like compounds with a penta-, hexa- and heptacyclic helical scaffold.
提出了一种甲氧基取代的光学纯芳香三炔烃系列(-)-S-5-9和(-)-R-10的模块化合成方法。该方法依赖于关键操作,如用烷氧基取代苄溴基和芳基-炔基偶联反应,将适当的甲氧基取代苯/萘构建基与手性炔醇合成物(如(-)-(2S)-丁-3-炔-2-醇和(-)-(1R)-苯基丙-2-炔-1-醇)结合。三炔烃分子包括二苯基乙炔、1-(苯乙炔基)萘或1,1'-乙炔-1,2-二基二萘核心单元。它们旨在作为甲氧基取代的非拉克米螺旋烯类化合物的[2+2+2]环化前体,具有五、六和七环螺旋骨架。