陸天堯臺灣大學:化學研究所陳嘉弘Chen, Jia-HongJia-HongChen2007-11-262018-07-102007-11-262018-07-102006http://ntur.lib.ntu.edu.tw//handle/246246/52008炔丙基硫縮酮經有機金屬試劑進行親硫性開環,與醛類化合物反應產生丙二烯醇中間體,於酸性條件下進行分子內環化反應,可生成呋喃與苯環交錯之寡聯芳香環化合物。利用一系列官能基化的炔丙基硫縮酮進行此一鍋式呋喃稠合反應,產生相對應之寡聯芳香環化合物,可進一步利用官能基轉換,應用於苯環兩端向外延伸的分子線之合成。值得注意的是當有酯基存在時,炔丙基硫縮酮仍可作為碳硫鍵之極性逆轉體。應用會集式合成策略,改變苯環兩端向外延伸的方法,可使分子線長度的延伸得以倍數增長。藉由此合成手法,改變單體炔丙基上的取代基,可合成出單體非重複之共軛奈米分子線。 除了藉由三氟醋酸來推動丙二烯醇中間體的合環反應外,醋酸汞亦能夠提供新的反應途徑合成呋喃化合物。其呋喃環上的汞則能夠以一鍋化的方式置換成碘,藉此製備出一系列含碘之呋喃化合物。酯基、烷基、芳香基……等官能基皆能在這樣的反應條件下存在而不分解。結合不同類型的耦合反應,可藉此合成出具位向選擇性的四取代呋喃化合物。A new one-pot furan annulation from corresponding propargylic dithioacetals and aldehydes has been reported recently. The bidirectional growth approach was also employed to the one-pot furan annulation for the synthesis of higher homologues towards molecular wires. It is noticeable that propargylic dithioacetal moiety could still serve as carbon-sulfur bond umpolung even in the presence of an ester group. The iterative divergent/convergent doubling approach provide an efficient strategy for the synthesis of benzene/furan alternating oligoaryls by utilizing our one-pot furan annulation reaction. The substituents on the furan rings can be easily varied by changing the substituents in the starting propargylic dithioacetals. This route provides a useful procedure for the synthesis of alternating benzene/furan oligomers without repetitive units. A convenient procedure for highly regioselective synthesis of tetrasubstituted furans from the corresponding propargylic dithioacetals is described. Treatment of propargylic dithioacetals with n-BuLi and an aldehyde followed by mercuric acetate-promoted annulation and desulfurization affords the corresponding mercurio-substituted furans. Subsequent replacement of the mercuric moiety with iodine and potassium iodide yield the corresponding 2,4,5-trisubstituted-3-iodofurans. It is noteworthy that although these reactions are multistage, it can be accomplished in one pot. Transition-metal catalyzed cross-coupling reactions of the iodofurans furnish a variety of fully substituted furans.謝誌 …………………………………………………………… i 中文摘要 ………………………………………………………… ii 英文摘要 ………………………………………………………… iii 目錄 ……………………………………………………………… iv 表目錄 …………………………………………………………… v 縮寫對照表 ……………………………………………………… vi 第一章 緒論 ……………………………………………………… 1 第二章 單體非重複之寡聯芳香環化合物 ……………………… 9 第一節 背景資料 ……………………………………… 10 第二節 結果與討論 …………………………………… 18 第三節 結論 …………………………………………… 23 第三章 四取代呋喃化合物 …………………………………… 24 第一節 背景資料 ……………………………………… 24 第二節 結果與討論 …………………………………… 33 第三節 結論 …………………………………………… 40 第四章 實驗部分 ………………………………………………… 42 第五章 參考文獻 ………………………………………………… 78 附錄 ……………………………………………………………… 821794027 bytesapplication/pdfen-US呋喃三氟醋酸炔丙基硫縮酮FuranTFAPropargylic dithioacetal單體非重複之寡聯芳香環與四取代呋喃化合物Furan-Containing Oligoaryls without Repetitive Units and Tetrasubstituted Furansthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/52008/1/ntu-95-R93223068-1.pdf