A Novel Synthetic Route to 3-Sulfenyl- and 3-Selenylindoles by <i>n</i>-Bu<sub>4</sub>NI-Induced Electrophilic Cyclization
作者:Yu Chen、Chul-Hee Cho、Richard C. Larock
DOI:10.1021/ol8021287
日期:2009.1.1
3-Sulfenyl- and 3-selenylindoles are prepared In excellent yields by the palladium/copper-catalyzed crossing coupling of N,N-dialkyl-o-iodoanilines and terminal alkynes, followed by electrophilic cyclization with arylsulfenyl chlorides and arylselenyl chlorides in the presence of a stoichiometric amount of n-Bu4NI.
Synthesis of 3-Sulfenyl- and 3-Selenylindoles by the Pd/Cu-Catalyzed Coupling of <i>N</i>,<i>N</i>-Dialkyl-2-iodoanilines and Terminal Alkynes, Followed by <i>n</i>-Bu<sub>4</sub>NI-Induced Electrophilic Cyclization
作者:Yu Chen、Chul-Hee Cho、Feng Shi、Richard C. Larock
DOI:10.1021/jo9014003
日期:2009.9.4
palladium/copper-catalyzed crossing coupling of N,N-dialkyl-ortho-iodoanilines and terminalalkynes and subsequent electrophilic cyclization of the resulting N,N-dialkyl-ortho-(1-alkynyl)anilines with arylsulfenyl chlorides or arylselenyl chlorides. The presence of a stoichiometric amount of n-Bu4NI is crucial to the success of the electrophilic cyclization. A variety of 3-sulfenyl- and 3-selenylindole derivatives
3-亚硫基-和 3-硒基吲哚可通过两步法合成,包括钯/铜催化的N , N - 二烷基-邻 -碘苯胺和末端炔烃的交叉偶联以及随后所得N , N - 的亲电环化二烷基-邻-(1-炔基)苯胺与芳基硫基氯或芳基硒基氯。存在化学计量的n -Bu 4NI 对于亲电环化的成功至关重要。各种带有烷基、乙烯基、芳基和杂芳基取代基的 3-亚苯基和 3-硒基吲哚衍生物已经以良好到极好的产率(高达 99%)制备。通过使用N,N-二苄基-邻-碘苯胺,已成功制备了3-硫基-N - H-吲哚。此外,3-磺酰基-和3-亚磺酰基吲哚也已通过相应的3-亚磺酰基吲哚的轻松氧化成功制备。