One-Pot Gold-Catalyzed Aminofluorination of Unprotected 2-Alkynylanilines
摘要:
A tandem gold(I)-catalyzed aminocylization/fluorination and a two-step, one-pot gold(III)-catalyzed cyclization/electrophilic fluorination provide a convenient and general method for the synthesis of 3,3-difluoro-2-substituted-3H-indoles in good yield under mild conditions. Extension of the procedure to the synthesis of 2-aryl-3-fluoro-1H-indoles is described. The reaction proceeds smoothly in green ethanol and does not require any base, acid, or N-protective group.
Silver-catalyzed one-pot cyclization/fluorination of 2-alkynylanilines: highly efficient synthesis of structurally diverse fluorinated indole derivatives
作者:Lei Yang、Yuanhong Ma、Feijie Song、Jingsong You
DOI:10.1039/c3cc49851d
日期:——
Highly efficient approaches to obtain structurally diverse fluorinated indolederivatives have been realized through the Ag-catalyzed one-pot cyclization/fluorination of 2-alkynylanilines in the presence of NFSI or Selectfluor.
A tandem gold(I)-catalyzed aminocylization/fluorination and a two-step, one-pot gold(III)-catalyzed cyclization/electrophilic fluorination provide a convenient and general method for the synthesis of 3,3-difluoro-2-substituted-3H-indoles in good yield under mild conditions. Extension of the procedure to the synthesis of 2-aryl-3-fluoro-1H-indoles is described. The reaction proceeds smoothly in green ethanol and does not require any base, acid, or N-protective group.
B(C6F5)3/CPA‐Catalyzed Aza‐Diels–Alder Reaction of 3,3‐Difluoro‐2‐Aryl‐3H‐indoles and Unactivated Dienes
Herein, we describe B(C6F5)3/CPA-catalyzed enantioselective aza-Diels–Alder reaction of 3,3-difluoro-2-Aryl-3H-indoles with unactivated dienes to access chiral 10,10-difluoro-tetrahydropyrido[1,2-a]indoles in good yields with good to excellent ee. The resulting cycloadducts containing an CF2 unit could be further transformed into other important building blocks.
在此,我们描述了 B(C 6 F 5 ) 3/ CPA 催化的 3,3-二氟-2-芳基-3 H-吲哚与未活化的二烯的对映选择性氮杂-狄尔斯-阿尔德反应,得到手性 10,10-二氟-四氢吡啶并[1,2- a ]吲哚的产率良好,ee 良好至优异。所得的含有CF 2单元的环加合物可以进一步转化为其他重要的结构单元。