Selectivity in Garratt–Braverman Cyclization of Aryl-/Heteroaryl-Substituted Unsymmetrical Bis-Propargyl Systems: Formal Synthesis of 7′-Desmethylkealiiquinone
作者:Joyee Das、Raja Mukherjee、Amit Basak
DOI:10.1021/jo402749d
日期:2014.5.2
various combinations of aryl/heteroaryl substituents at the acetylene termini were synthesized, and their reactivity under basic conditions was studied. Moderate to high (chemo)selectivity was observed, which followed a trend opposite to that reported earlier for the corresponding sufones. The major products obtained in most cases (except with indole) were formed via participation of the heteroaryl ring
合成了在乙炔末端含有不饱和芳基/杂芳基取代基的各种组合的不对称双炔丙基醚和磺酰胺,并研究了它们在碱性条件下的反应性。观察到中等至高(化学)选择性,其趋势与先前报道的相应次磺酮相反。在大多数情况下(除吲哚以外)获得的主要产物是通过杂芳基环或电子含量较低的芳基环的参与而形成的。利用在咪唑基体系中观察到的选择性完成了海洋生物碱酮基醌的类似物7'-去甲基酮基醌的正式全合成。