作者:Oscar Lozano、George Blessley、Teresa Martinez del Campo、Amber L. Thompson、Guy T. Giuffredi、Michela Bettati、Matthew Walker、Richard Borman、Véronique Gouverneur
DOI:10.1002/anie.201103151
日期:2011.8.22
Enantioenriched fluorinated heterocycles can be prepared through fluorocyclizations of prochiral indoles (see scheme; Ts=tosyl, Bn=benzyl, Boc=tert‐butoxycarbonyl). More than twenty examples for this cascade fluorination–cyclization, which is catalyzed by cinchona alkaloids and employs N‐fluorobenzenesulfonimide as the electrophilic fluorine source have been explored, and an unprecedented catalytic
Versatile procedures for fluorocyclization of various tryptamine and tryptophol derivatives to obtain the corresponding 3a-fluoropyrrolo[2.3-b]indoles and 3a-fluorofuro[2.3-b]indoles, respectively were developed employing N-fluoro-2,4,6-trimethylpyridinium triflate (FP-T300) or Selectfluor™ as the electrophilic fluorinating agent. The use of NaHCO3 for fluorocyclization was effective in improving the
通用于各种色胺和色醇衍生物得到相应的3α-fluoropyrrolo [2.3-的fluorocyclization程序b ]吲哚和3a-fluorofuro [2.3- b ]吲哚,分别开发了采用Ñ氟-2,4,6-三甲基三氟甲磺酸酯(FP-T300)或的Selectfluor™作为电氟化剂。使用碳酸氢钠的3对fluorocyclization是有效地改善酸不稳定fluoropyrrolo(呋喃并)吲哚的产率。我们的程序是用于fluoropyrrolo(呋喃并)吲哚带有游离NH吲哚基团的合成特别有用。