A novel procedure for the synthesis of C2‐diversified oxazoles, through palladium‐catalyzed imidoylative cyclization of α‐isocyanoacetamides with aryl, vinyl, alkynyl halides, or triflates, was developed. Migratory insertion of isocyanide into a C‐palladium(II) intermediate in a cascade process was also realized, generating alkyl‐substituted oxazoles. Therefore, oxazoles functionalized at the C2 position
Pd-Catalyzed Highly Regio- and Stereoselective Formation of C–C Double Bonds: An Efficient Method for the Synthesis of Benzofuran-, Dihydrobenzofuran-, and Indoline-Containing Alkenes
A highly regio- and stereoselective C–C double bond formation reactionvia Pd-catalyzed Heck-type cascade process with N-tosylhydrazones has been developed. Various N-tosylhydrazones derived from both ketones and aldehydes are found to be efficient substrates to provide di- and trisubstitutedolefins with high regio- and stereoselectivity. Furthermore, this reaction has a good functional group tolerance
Silver-Catalyzed Carboazidation of Arylacrylamides
作者:Xiao-Hong Wei、Ya-Min Li、An-Xi Zhou、Ting-Ting Yang、Shang-Dong Yang
DOI:10.1021/ol402138y
日期:2013.8.16
inexpensive method of nontoxic, silver-salt-catalyzed carboazidation of arylacrylamides to afford corresponding azide oxindoles is reported. This reaction system exhibits great functional group tolerance. All products form a crucial skeleton for the synthesis of various indole alkaloids.
Synthesis of Oxindoles by Iron-Catalyzed Oxidative 1,2-Alkylarylation of Activated Alkenes with an Aryl C(sp<sup>2</sup>)H Bond and a C(sp<sup>3</sup>)H Bond Adjacent to a Heteroatom
作者:Wen-Ting Wei、Ming-Bo Zhou、Jian-Hong Fan、Wei Liu、Ren-Jie Song、Yu Liu、Ming Hu、Peng Xie、Jin-Heng Li
DOI:10.1002/anie.201210029
日期:2013.3.25
Difunctionalization: Inexpensive and environmentally benign FeCl3 catalyzes the oxidative 1,2‐alkylarylation of activatedalkenes with an aryl C(sp2)Hbond and a C(sp3)Hbond adjacent to a heteroatom. This reaction is a new strategy for the synthesis of oxindoles and makes use of DBU as ligand and TBHP as oxidant (see scheme, TBHP=tert‐butyl hydrogenperoxide).
Synthesis of Oxindoles through Silver-Catalyzed Trifluoromethylation-, Difluoromethylation- and Arylsulfonylation-Cyclization Reaction of<i>N</i>-Arylacrylamides
作者:Jidan Liu、Shaobo Zhuang、Qingwen Gui、Xiang Chen、Zhiyong Yang、Ze Tan
DOI:10.1002/ejoc.201400087
日期:2014.5
Efficient synthesis of trifluoromethyl and difluoromethyl-substituted oxindoles was achieved by reacting Langlois reagent or Baran reagent with N-arylacrylamides. However, the reaction of aryl sulfinic acid sodium salts with N-arylacrylamides did not give the desulfinative products, instead, aryl sulfonated products were produced.
通过 Langlois 试剂或 Baran 试剂与 N-芳基丙烯酰胺反应,实现了三氟甲基和二氟甲基取代的羟吲哚的有效合成。然而,芳基亚磺酸钠盐与N-芳基丙烯酰胺的反应没有得到脱亚磺化产物,而是产生了芳基磺化产物。