Synthesis of Polysubstituted Benzothiophenes and Sulfur-Containing Polycyclic Aromatic Compounds via Samarium Diiodide Promoted Three-Component Coupling Reactions of Thiophene-2-carboxylate
作者:Shyh-Ming Yang、Jiun-Jie Shie、Jim-Min Fang、Sandip Kumar Nandy、Hung-Yu Chang、Syn-Hung Lu、Gladys Wang
DOI:10.1021/jo0257849
日期:2002.7.1
polysubstituted thiophenes (e.g., 4 and 11) or benzothiophenes (e.g., 5, 13, and 14) depending on the reaction conditions. Oxidative annulations of 4,5-diarylthiophenes 11 and 4,5,6,7-tetraphenylbenzothiophenes 14 were carried out by photochemical or chemical methods to give the sulfur-containing polycyclic aromatic compounds, such as phenanthro[9,10-b]thiophene-2-carboxylate, piceno[13,14-b]thiophene-2-carboxylate
通过促进二碘化sa,噻吩-2-羧酸盐在C-4和C-5位置与2当量的酮反应,得到2和9等二醇。由于中间有机organo物种具有亲氧性,但又不是太碱性,因此实现了具有各种酮底物的双羟烷基化,包括烷基芳基酮,乙酰噻吩,环己酮,α-四氢萘酮和α-苯基苯乙酮,而没有副反应的复杂化。二醇产物经过酸催化脱水,得到二烯(例如3和10),将其用DDQ处理,得到多取代的噻吩(例如4和11)或苯并噻吩(例如5、13和14),具体取决于反应条件。4,5-二芳基噻吩11和4,5,6的氧化环 通过光化学或化学方法进行7-四苯基苯并噻吩14的合成,得到含硫的多环芳族化合物,例如菲咯啉[9,10-b]噻吩-2-羧酸盐,苦味酚[13,14-b]噻吩-2-羧酸盐和三苯并[fg,ij,rst]五苯[15,16-b]噻吩-2-羧酸盐。该方法适用于制备多取代的噻吩,苯并噻吩以及具有液晶,光致变色和其他功能特性的相关化合物。