报道了通过Pd- t BuONO共催化邻烯丙基苯胺的好氧环异构化可规模化和实用地合成官能化的吲哚。使用分子氧作为末端氧化剂,以中等至良好的产率制备了一系列取代的吲哚。避免使用有害的氧化剂,重金属助催化剂和高沸点溶剂(例如DMF和DMSO),可使该方法应用于药物合成。吲哚美辛的实用克级合成证明了其应用潜力。
Active thionium species mediated functionalization at the 2α-position of indole derivatives
作者:Kazuhiro Higuchi、Masanori Tayu、Tomomi Kawasaki
DOI:10.1039/c1cc11645b
日期:——
A combination of dimethyl sulfoxide (DMSO) and trifluoroacetic anhydride (TFAA) mediates functionalization at the 2α-position of indole derivatives. Carbon and heteroatom nucleophiles were directly introduced via a one-pot procedure in excellent yields.
The one-pot 2 alpha- and 3 alpha-functionalization of 2,3-disubstituted indoles using a hypervalent iodine reagent has been developed. The substitution at the 2 alpha-position of indoles took place using phenyliodinebis(trifluoroacetate) with oxygen and carbon nucleophiles in moderate yields. The combination of iodosobenzene and trimethylsilyl azide afforded 3 alpha-azide derivatives preferentially. The latter reaction was applied to other 2,3-disubstituted indoles.
Fletcher et al., Journal of the Chemical Society, 1953, p. 3898,3901
作者:Fletcher et al.
DOI:——
日期:——
Takechi, Haruko; Machida, Minoru; Kanaoka, Yuichi, Chemical and pharmaceutical bulletin, 1988, vol. 36, # 10, p. 3770 - 3779